Mercurial > dwindows
annotate acinclude.m4 @ 3005:522ef24b0aba default tip
GTK4: Fix even more deprecation warnings in GTK 4.10 and later.
Migrate to GtkAlertDialog for 4.10 from GtkMessageDialog.
Still need to center the dialog or something.
author | bsmith@81767d24-ef19-dc11-ae90-00e081727c95 |
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date | Wed, 20 Dec 2023 05:17:54 +0000 |
parents | 83c17a84bc27 |
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rev | line source |
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1 # generated automatically by aclocal 1.16.5 -*- Autoconf -*- |
3 | 2 |
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3 # Copyright (C) 1996-2021 Free Software Foundation, Inc. |
3 | 4 |
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5 # This file is free software; the Free Software Foundation |
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6 # gives unlimited permission to copy and/or distribute it, |
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7 # with or without modifications, as long as this notice is preserved. |
3 | 8 |
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9 # This program is distributed in the hope that it will be useful, |
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10 # but WITHOUT ANY WARRANTY, to the extent permitted by law; without |
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11 # even the implied warranty of MERCHANTABILITY or FITNESS FOR A |
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12 # PARTICULAR PURPOSE. |
3 | 13 |
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14 m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])]) |
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15 # =========================================================================== |
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16 # https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html |
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17 # =========================================================================== |
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18 # |
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19 # SYNOPSIS |
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20 # |
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21 # AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional]) |
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22 # |
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23 # DESCRIPTION |
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24 # |
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25 # Check for baseline language coverage in the compiler for the specified |
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26 # version of the C++ standard. If necessary, add switches to CXX and |
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27 # CXXCPP to enable support. VERSION may be '11', '14', '17', or '20' for |
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28 # the respective C++ standard version. |
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29 # |
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30 # The second argument, if specified, indicates whether you insist on an |
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31 # extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g. |
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32 # -std=c++11). If neither is specified, you get whatever works, with |
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33 # preference for no added switch, and then for an extended mode. |
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34 # |
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35 # The third argument, if specified 'mandatory' or if left unspecified, |
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36 # indicates that baseline support for the specified C++ standard is |
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37 # required and that the macro should error out if no mode with that |
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38 # support is found. If specified 'optional', then configuration proceeds |
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39 # regardless, after defining HAVE_CXX${VERSION} if and only if a |
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40 # supporting mode is found. |
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41 # |
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42 # LICENSE |
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43 # |
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44 # Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com> |
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45 # Copyright (c) 2012 Zack Weinberg <zackw@panix.com> |
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46 # Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu> |
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47 # Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com> |
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48 # Copyright (c) 2015 Paul Norman <penorman@mac.com> |
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49 # Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu> |
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50 # Copyright (c) 2016, 2018 Krzesimir Nowak <qdlacz@gmail.com> |
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51 # Copyright (c) 2019 Enji Cooper <yaneurabeya@gmail.com> |
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52 # Copyright (c) 2020 Jason Merrill <jason@redhat.com> |
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53 # Copyright (c) 2021 Jörn Heusipp <osmanx@problemloesungsmaschine.de> |
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54 # |
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55 # Copying and distribution of this file, with or without modification, are |
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56 # permitted in any medium without royalty provided the copyright notice |
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57 # and this notice are preserved. This file is offered as-is, without any |
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58 # warranty. |
3 | 59 |
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60 #serial 15 |
3 | 61 |
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62 dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro |
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63 dnl (serial version number 13). |
3 | 64 |
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65 AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl |
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66 m4_if([$1], [11], [ax_cxx_compile_alternatives="11 0x"], |
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67 [$1], [14], [ax_cxx_compile_alternatives="14 1y"], |
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68 [$1], [17], [ax_cxx_compile_alternatives="17 1z"], |
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69 [$1], [20], [ax_cxx_compile_alternatives="20"], |
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70 [m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl |
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71 m4_if([$2], [], [], |
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72 [$2], [ext], [], |
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73 [$2], [noext], [], |
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74 [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl |
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75 m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true], |
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76 [$3], [mandatory], [ax_cxx_compile_cxx$1_required=true], |
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77 [$3], [optional], [ax_cxx_compile_cxx$1_required=false], |
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78 [m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])]) |
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79 AC_LANG_PUSH([C++])dnl |
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80 ac_success=no |
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81 |
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82 m4_if([$2], [], [dnl |
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83 AC_CACHE_CHECK(whether $CXX supports C++$1 features by default, |
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84 ax_cv_cxx_compile_cxx$1, |
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85 [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], |
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86 [ax_cv_cxx_compile_cxx$1=yes], |
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87 [ax_cv_cxx_compile_cxx$1=no])]) |
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88 if test x$ax_cv_cxx_compile_cxx$1 = xyes; then |
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89 ac_success=yes |
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90 fi]) |
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91 |
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92 m4_if([$2], [noext], [], [dnl |
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93 if test x$ac_success = xno; then |
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94 for alternative in ${ax_cxx_compile_alternatives}; do |
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95 switch="-std=gnu++${alternative}" |
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96 cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch]) |
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97 AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch, |
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98 $cachevar, |
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99 [ac_save_CXX="$CXX" |
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100 CXX="$CXX $switch" |
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101 AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], |
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102 [eval $cachevar=yes], |
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103 [eval $cachevar=no]) |
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104 CXX="$ac_save_CXX"]) |
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105 if eval test x\$$cachevar = xyes; then |
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106 CXX="$CXX $switch" |
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107 if test -n "$CXXCPP" ; then |
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108 CXXCPP="$CXXCPP $switch" |
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109 fi |
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110 ac_success=yes |
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111 break |
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112 fi |
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113 done |
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114 fi]) |
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115 |
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116 m4_if([$2], [ext], [], [dnl |
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117 if test x$ac_success = xno; then |
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118 dnl HP's aCC needs +std=c++11 according to: |
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119 dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf |
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120 dnl Cray's crayCC needs "-h std=c++11" |
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121 for alternative in ${ax_cxx_compile_alternatives}; do |
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122 for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do |
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123 cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch]) |
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124 AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch, |
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125 $cachevar, |
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126 [ac_save_CXX="$CXX" |
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127 CXX="$CXX $switch" |
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128 AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], |
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129 [eval $cachevar=yes], |
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130 [eval $cachevar=no]) |
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131 CXX="$ac_save_CXX"]) |
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132 if eval test x\$$cachevar = xyes; then |
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133 CXX="$CXX $switch" |
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134 if test -n "$CXXCPP" ; then |
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135 CXXCPP="$CXXCPP $switch" |
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136 fi |
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137 ac_success=yes |
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138 break |
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139 fi |
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140 done |
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141 if test x$ac_success = xyes; then |
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142 break |
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143 fi |
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144 done |
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145 fi]) |
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146 AC_LANG_POP([C++]) |
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147 if test x$ax_cxx_compile_cxx$1_required = xtrue; then |
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148 if test x$ac_success = xno; then |
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149 AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.]) |
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150 fi |
3 | 151 fi |
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152 if test x$ac_success = xno; then |
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153 HAVE_CXX$1=0 |
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154 AC_MSG_NOTICE([No compiler with C++$1 support was found]) |
3 | 155 else |
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156 HAVE_CXX$1=1 |
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157 AC_DEFINE(HAVE_CXX$1,1, |
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158 [define if the compiler supports basic C++$1 syntax]) |
3 | 159 fi |
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160 AC_SUBST(HAVE_CXX$1) |
3 | 161 ]) |
162 | |
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163 |
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164 dnl Test body for checking C++11 support |
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165 |
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166 m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11], |
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167 _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 |
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168 ) |
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169 |
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170 dnl Test body for checking C++14 support |
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171 |
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172 m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14], |
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173 _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 |
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174 _AX_CXX_COMPILE_STDCXX_testbody_new_in_14 |
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175 ) |
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176 |
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177 dnl Test body for checking C++17 support |
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178 |
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179 m4_define([_AX_CXX_COMPILE_STDCXX_testbody_17], |
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180 _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 |
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181 _AX_CXX_COMPILE_STDCXX_testbody_new_in_14 |
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182 _AX_CXX_COMPILE_STDCXX_testbody_new_in_17 |
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183 ) |
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184 |
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185 dnl Test body for checking C++20 support |
3 | 186 |
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187 m4_define([_AX_CXX_COMPILE_STDCXX_testbody_20], |
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188 _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 |
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189 _AX_CXX_COMPILE_STDCXX_testbody_new_in_14 |
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190 _AX_CXX_COMPILE_STDCXX_testbody_new_in_17 |
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191 _AX_CXX_COMPILE_STDCXX_testbody_new_in_20 |
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192 ) |
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193 |
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194 |
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195 dnl Tests for new features in C++11 |
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196 |
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197 m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[ |
3 | 198 |
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199 // If the compiler admits that it is not ready for C++11, why torture it? |
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200 // Hopefully, this will speed up the test. |
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201 |
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202 #ifndef __cplusplus |
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203 |
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204 #error "This is not a C++ compiler" |
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205 |
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206 // MSVC always sets __cplusplus to 199711L in older versions; newer versions |
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207 // only set it correctly if /Zc:__cplusplus is specified as well as a |
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208 // /std:c++NN switch: |
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209 // https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/ |
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210 #elif __cplusplus < 201103L && !defined _MSC_VER |
3 | 211 |
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212 #error "This is not a C++11 compiler" |
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213 |
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214 #else |
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215 |
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216 namespace cxx11 |
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217 { |
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218 |
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219 namespace test_static_assert |
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220 { |
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221 |
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222 template <typename T> |
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223 struct check |
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224 { |
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225 static_assert(sizeof(int) <= sizeof(T), "not big enough"); |
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226 }; |
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227 |
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228 } |
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229 |
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230 namespace test_final_override |
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231 { |
3 | 232 |
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233 struct Base |
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234 { |
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235 virtual ~Base() {} |
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236 virtual void f() {} |
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237 }; |
3 | 238 |
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239 struct Derived : public Base |
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240 { |
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241 virtual ~Derived() override {} |
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242 virtual void f() override {} |
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243 }; |
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244 |
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245 } |
3 | 246 |
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247 namespace test_double_right_angle_brackets |
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248 { |
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249 |
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250 template < typename T > |
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251 struct check {}; |
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252 |
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253 typedef check<void> single_type; |
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254 typedef check<check<void>> double_type; |
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255 typedef check<check<check<void>>> triple_type; |
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256 typedef check<check<check<check<void>>>> quadruple_type; |
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257 |
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258 } |
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259 |
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260 namespace test_decltype |
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261 { |
3 | 262 |
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263 int |
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264 f() |
3 | 265 { |
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266 int a = 1; |
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267 decltype(a) b = 2; |
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268 return a + b; |
3 | 269 } |
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270 |
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271 } |
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272 |
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273 namespace test_type_deduction |
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274 { |
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275 |
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276 template < typename T1, typename T2 > |
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277 struct is_same |
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278 { |
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279 static const bool value = false; |
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280 }; |
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281 |
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282 template < typename T > |
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283 struct is_same<T, T> |
3 | 284 { |
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285 static const bool value = true; |
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286 }; |
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287 |
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288 template < typename T1, typename T2 > |
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289 auto |
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290 add(T1 a1, T2 a2) -> decltype(a1 + a2) |
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291 { |
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292 return a1 + a2; |
3 | 293 } |
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294 |
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295 int |
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296 test(const int c, volatile int v) |
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297 { |
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298 static_assert(is_same<int, decltype(0)>::value == true, ""); |
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299 static_assert(is_same<int, decltype(c)>::value == false, ""); |
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300 static_assert(is_same<int, decltype(v)>::value == false, ""); |
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301 auto ac = c; |
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302 auto av = v; |
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303 auto sumi = ac + av + 'x'; |
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304 auto sumf = ac + av + 1.0; |
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305 static_assert(is_same<int, decltype(ac)>::value == true, ""); |
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306 static_assert(is_same<int, decltype(av)>::value == true, ""); |
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307 static_assert(is_same<int, decltype(sumi)>::value == true, ""); |
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308 static_assert(is_same<int, decltype(sumf)>::value == false, ""); |
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309 static_assert(is_same<int, decltype(add(c, v))>::value == true, ""); |
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310 return (sumf > 0.0) ? sumi : add(c, v); |
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311 } |
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312 |
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313 } |
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314 |
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315 namespace test_noexcept |
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316 { |
3 | 317 |
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318 int f() { return 0; } |
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319 int g() noexcept { return 0; } |
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320 |
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321 static_assert(noexcept(f()) == false, ""); |
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322 static_assert(noexcept(g()) == true, ""); |
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323 |
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324 } |
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325 |
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326 namespace test_constexpr |
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327 { |
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328 |
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329 template < typename CharT > |
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330 unsigned long constexpr |
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331 strlen_c_r(const CharT *const s, const unsigned long acc) noexcept |
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332 { |
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333 return *s ? strlen_c_r(s + 1, acc + 1) : acc; |
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334 } |
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335 |
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336 template < typename CharT > |
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337 unsigned long constexpr |
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338 strlen_c(const CharT *const s) noexcept |
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339 { |
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340 return strlen_c_r(s, 0UL); |
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341 } |
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342 |
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343 static_assert(strlen_c("") == 0UL, ""); |
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344 static_assert(strlen_c("1") == 1UL, ""); |
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345 static_assert(strlen_c("example") == 7UL, ""); |
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346 static_assert(strlen_c("another\0example") == 7UL, ""); |
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347 |
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348 } |
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349 |
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350 namespace test_rvalue_references |
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351 { |
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352 |
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353 template < int N > |
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354 struct answer |
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355 { |
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356 static constexpr int value = N; |
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357 }; |
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358 |
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359 answer<1> f(int&) { return answer<1>(); } |
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360 answer<2> f(const int&) { return answer<2>(); } |
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361 answer<3> f(int&&) { return answer<3>(); } |
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362 |
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363 void |
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364 test() |
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365 { |
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366 int i = 0; |
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367 const int c = 0; |
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368 static_assert(decltype(f(i))::value == 1, ""); |
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369 static_assert(decltype(f(c))::value == 2, ""); |
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370 static_assert(decltype(f(0))::value == 3, ""); |
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371 } |
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372 |
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373 } |
3 | 374 |
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375 namespace test_uniform_initialization |
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376 { |
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377 |
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378 struct test |
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379 { |
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380 static const int zero {}; |
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381 static const int one {1}; |
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382 }; |
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383 |
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384 static_assert(test::zero == 0, ""); |
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385 static_assert(test::one == 1, ""); |
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386 |
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387 } |
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388 |
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389 namespace test_lambdas |
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390 { |
3 | 391 |
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392 void |
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393 test1() |
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394 { |
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395 auto lambda1 = [](){}; |
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396 auto lambda2 = lambda1; |
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397 lambda1(); |
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398 lambda2(); |
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399 } |
3 | 400 |
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401 int |
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402 test2() |
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403 { |
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404 auto a = [](int i, int j){ return i + j; }(1, 2); |
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405 auto b = []() -> int { return '0'; }(); |
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406 auto c = [=](){ return a + b; }(); |
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407 auto d = [&](){ return c; }(); |
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408 auto e = [a, &b](int x) mutable { |
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409 const auto identity = [](int y){ return y; }; |
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410 for (auto i = 0; i < a; ++i) |
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411 a += b--; |
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412 return x + identity(a + b); |
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413 }(0); |
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414 return a + b + c + d + e; |
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415 } |
3 | 416 |
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417 int |
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418 test3() |
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419 { |
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420 const auto nullary = [](){ return 0; }; |
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421 const auto unary = [](int x){ return x; }; |
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422 using nullary_t = decltype(nullary); |
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423 using unary_t = decltype(unary); |
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424 const auto higher1st = [](nullary_t f){ return f(); }; |
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425 const auto higher2nd = [unary](nullary_t f1){ |
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426 return [unary, f1](unary_t f2){ return f2(unary(f1())); }; |
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427 }; |
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428 return higher1st(nullary) + higher2nd(nullary)(unary); |
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429 } |
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430 |
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431 } |
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432 |
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433 namespace test_variadic_templates |
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434 { |
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435 |
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436 template <int...> |
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437 struct sum; |
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438 |
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439 template <int N0, int... N1toN> |
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440 struct sum<N0, N1toN...> |
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441 { |
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442 static constexpr auto value = N0 + sum<N1toN...>::value; |
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443 }; |
3 | 444 |
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445 template <> |
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446 struct sum<> |
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447 { |
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448 static constexpr auto value = 0; |
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449 }; |
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450 |
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451 static_assert(sum<>::value == 0, ""); |
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452 static_assert(sum<1>::value == 1, ""); |
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453 static_assert(sum<23>::value == 23, ""); |
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454 static_assert(sum<1, 2>::value == 3, ""); |
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455 static_assert(sum<5, 5, 11>::value == 21, ""); |
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456 static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, ""); |
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457 |
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458 } |
3 | 459 |
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460 // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae |
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461 // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function |
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462 // because of this. |
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463 namespace test_template_alias_sfinae |
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464 { |
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465 |
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466 struct foo {}; |
3 | 467 |
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468 template<typename T> |
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469 using member = typename T::member_type; |
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470 |
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471 template<typename T> |
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472 void func(...) {} |
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473 |
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474 template<typename T> |
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475 void func(member<T>*) {} |
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476 |
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477 void test(); |
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478 |
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479 void test() { func<foo>(0); } |
3 | 480 |
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481 } |
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482 |
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483 } // namespace cxx11 |
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484 |
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485 #endif // __cplusplus >= 201103L |
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486 |
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487 ]]) |
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488 |
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489 |
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490 dnl Tests for new features in C++14 |
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491 |
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492 m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[ |
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493 |
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494 // If the compiler admits that it is not ready for C++14, why torture it? |
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495 // Hopefully, this will speed up the test. |
3 | 496 |
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497 #ifndef __cplusplus |
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498 |
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499 #error "This is not a C++ compiler" |
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500 |
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501 #elif __cplusplus < 201402L && !defined _MSC_VER |
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502 |
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503 #error "This is not a C++14 compiler" |
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504 |
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505 #else |
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506 |
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507 namespace cxx14 |
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508 { |
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509 |
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510 namespace test_polymorphic_lambdas |
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511 { |
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512 |
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513 int |
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514 test() |
3 | 515 { |
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516 const auto lambda = [](auto&&... args){ |
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517 const auto istiny = [](auto x){ |
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518 return (sizeof(x) == 1UL) ? 1 : 0; |
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519 }; |
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520 const int aretiny[] = { istiny(args)... }; |
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521 return aretiny[0]; |
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522 }; |
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523 return lambda(1, 1L, 1.0f, '1'); |
3 | 524 } |
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525 |
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526 } |
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527 |
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528 namespace test_binary_literals |
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529 { |
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530 |
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531 constexpr auto ivii = 0b0000000000101010; |
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532 static_assert(ivii == 42, "wrong value"); |
3 | 533 |
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534 } |
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535 |
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536 namespace test_generalized_constexpr |
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537 { |
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538 |
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539 template < typename CharT > |
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540 constexpr unsigned long |
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541 strlen_c(const CharT *const s) noexcept |
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542 { |
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543 auto length = 0UL; |
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544 for (auto p = s; *p; ++p) |
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545 ++length; |
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546 return length; |
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547 } |
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548 |
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549 static_assert(strlen_c("") == 0UL, ""); |
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550 static_assert(strlen_c("x") == 1UL, ""); |
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551 static_assert(strlen_c("test") == 4UL, ""); |
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552 static_assert(strlen_c("another\0test") == 7UL, ""); |
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553 |
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554 } |
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555 |
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556 namespace test_lambda_init_capture |
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557 { |
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558 |
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559 int |
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560 test() |
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561 { |
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562 auto x = 0; |
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563 const auto lambda1 = [a = x](int b){ return a + b; }; |
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564 const auto lambda2 = [a = lambda1(x)](){ return a; }; |
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565 return lambda2(); |
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566 } |
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567 |
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568 } |
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569 |
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570 namespace test_digit_separators |
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571 { |
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572 |
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573 constexpr auto ten_million = 100'000'000; |
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574 static_assert(ten_million == 100000000, ""); |
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575 |
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576 } |
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577 |
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578 namespace test_return_type_deduction |
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579 { |
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580 |
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581 auto f(int& x) { return x; } |
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582 decltype(auto) g(int& x) { return x; } |
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583 |
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584 template < typename T1, typename T2 > |
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585 struct is_same |
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586 { |
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587 static constexpr auto value = false; |
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588 }; |
3 | 589 |
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590 template < typename T > |
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591 struct is_same<T, T> |
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592 { |
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593 static constexpr auto value = true; |
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594 }; |
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595 |
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596 int |
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597 test() |
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598 { |
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599 auto x = 0; |
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600 static_assert(is_same<int, decltype(f(x))>::value, ""); |
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601 static_assert(is_same<int&, decltype(g(x))>::value, ""); |
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602 return x; |
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603 } |
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604 |
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605 } |
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606 |
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607 } // namespace cxx14 |
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608 |
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609 #endif // __cplusplus >= 201402L |
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610 |
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611 ]]) |
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612 |
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613 |
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614 dnl Tests for new features in C++17 |
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615 |
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616 m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_17], [[ |
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617 |
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618 // If the compiler admits that it is not ready for C++17, why torture it? |
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619 // Hopefully, this will speed up the test. |
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620 |
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621 #ifndef __cplusplus |
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622 |
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623 #error "This is not a C++ compiler" |
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624 |
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625 #elif __cplusplus < 201703L && !defined _MSC_VER |
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626 |
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627 #error "This is not a C++17 compiler" |
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628 |
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629 #else |
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630 |
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631 #include <initializer_list> |
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632 #include <utility> |
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633 #include <type_traits> |
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634 |
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635 namespace cxx17 |
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636 { |
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637 |
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638 namespace test_constexpr_lambdas |
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639 { |
3 | 640 |
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641 constexpr int foo = [](){return 42;}(); |
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642 |
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643 } |
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644 |
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645 namespace test::nested_namespace::definitions |
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646 { |
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647 |
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648 } |
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649 |
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650 namespace test_fold_expression |
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651 { |
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652 |
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653 template<typename... Args> |
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654 int multiply(Args... args) |
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655 { |
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656 return (args * ... * 1); |
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657 } |
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658 |
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659 template<typename... Args> |
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660 bool all(Args... args) |
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661 { |
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662 return (args && ...); |
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663 } |
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664 |
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665 } |
3 | 666 |
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667 namespace test_extended_static_assert |
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668 { |
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669 |
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670 static_assert (true); |
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671 |
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672 } |
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673 |
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674 namespace test_auto_brace_init_list |
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675 { |
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676 |
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677 auto foo = {5}; |
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678 auto bar {5}; |
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679 |
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680 static_assert(std::is_same<std::initializer_list<int>, decltype(foo)>::value); |
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681 static_assert(std::is_same<int, decltype(bar)>::value); |
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682 } |
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683 |
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684 namespace test_typename_in_template_template_parameter |
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685 { |
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686 |
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687 template<template<typename> typename X> struct D; |
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688 |
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689 } |
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690 |
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691 namespace test_fallthrough_nodiscard_maybe_unused_attributes |
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692 { |
3 | 693 |
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694 int f1() |
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695 { |
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696 return 42; |
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697 } |
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698 |
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699 [[nodiscard]] int f2() |
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700 { |
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701 [[maybe_unused]] auto unused = f1(); |
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702 |
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703 switch (f1()) |
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704 { |
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705 case 17: |
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706 f1(); |
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707 [[fallthrough]]; |
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708 case 42: |
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709 f1(); |
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710 } |
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711 return f1(); |
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712 } |
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713 |
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714 } |
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715 |
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716 namespace test_extended_aggregate_initialization |
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717 { |
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718 |
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719 struct base1 |
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720 { |
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721 int b1, b2 = 42; |
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722 }; |
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723 |
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724 struct base2 |
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725 { |
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726 base2() { |
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727 b3 = 42; |
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728 } |
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729 int b3; |
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730 }; |
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731 |
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732 struct derived : base1, base2 |
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733 { |
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734 int d; |
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735 }; |
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736 |
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737 derived d1 {{1, 2}, {}, 4}; // full initialization |
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738 derived d2 {{}, {}, 4}; // value-initialized bases |
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739 |
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740 } |
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741 |
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742 namespace test_general_range_based_for_loop |
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743 { |
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744 |
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745 struct iter |
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746 { |
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747 int i; |
3 | 748 |
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749 int& operator* () |
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750 { |
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751 return i; |
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752 } |
3 | 753 |
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|
754 const int& operator* () const |
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755 { |
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756 return i; |
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757 } |
3 | 758 |
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759 iter& operator++() |
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760 { |
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761 ++i; |
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762 return *this; |
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763 } |
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764 }; |
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765 |
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|
766 struct sentinel |
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767 { |
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768 int i; |
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769 }; |
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|
770 |
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771 bool operator== (const iter& i, const sentinel& s) |
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772 { |
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773 return i.i == s.i; |
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774 } |
3 | 775 |
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776 bool operator!= (const iter& i, const sentinel& s) |
3 | 777 { |
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778 return !(i == s); |
3 | 779 } |
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|
780 |
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|
781 struct range |
3 | 782 { |
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783 iter begin() const |
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784 { |
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785 return {0}; |
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786 } |
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|
787 |
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|
788 sentinel end() const |
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789 { |
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790 return {5}; |
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791 } |
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792 }; |
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793 |
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|
794 void f() |
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795 { |
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796 range r {}; |
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797 |
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|
798 for (auto i : r) |
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799 { |
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800 [[maybe_unused]] auto v = i; |
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801 } |
3 | 802 } |
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803 |
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804 } |
3 | 805 |
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806 namespace test_lambda_capture_asterisk_this_by_value |
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807 { |
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808 |
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809 struct t |
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810 { |
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|
811 int i; |
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812 int foo() |
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813 { |
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|
814 return [*this]() |
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815 { |
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816 return i; |
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diff
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|
817 }(); |
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818 } |
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819 }; |
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820 |
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821 } |
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822 |
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|
823 namespace test_enum_class_construction |
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824 { |
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825 |
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|
826 enum class byte : unsigned char |
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827 {}; |
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828 |
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|
829 byte foo {42}; |
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830 |
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831 } |
83c17a84bc27
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832 |
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|
833 namespace test_constexpr_if |
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834 { |
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835 |
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|
836 template <bool cond> |
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|
837 int f () |
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838 { |
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|
839 if constexpr(cond) |
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840 { |
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|
841 return 13; |
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842 } |
83c17a84bc27
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|
843 else |
83c17a84bc27
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diff
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|
844 { |
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|
845 return 42; |
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846 } |
83c17a84bc27
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|
847 } |
83c17a84bc27
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|
848 |
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849 } |
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|
850 |
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|
851 namespace test_selection_statement_with_initializer |
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852 { |
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|
853 |
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|
854 int f() |
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855 { |
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|
856 return 13; |
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|
857 } |
3 | 858 |
2970
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|
859 int f2() |
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|
860 { |
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|
861 if (auto i = f(); i > 0) |
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|
862 { |
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|
863 return 3; |
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864 } |
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865 |
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|
866 switch (auto i = f(); i + 4) |
83c17a84bc27
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|
867 { |
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diff
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|
868 case 17: |
83c17a84bc27
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bsmith@81767d24-ef19-dc11-ae90-00e081727c95
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diff
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|
869 return 2; |
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|
870 |
83c17a84bc27
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bsmith@81767d24-ef19-dc11-ae90-00e081727c95
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diff
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|
871 default: |
83c17a84bc27
Update the configure scripts with the latest autotools.
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diff
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|
872 return 1; |
83c17a84bc27
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diff
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|
873 } |
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|
874 } |
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|
875 |
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|
876 } |
83c17a84bc27
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diff
changeset
|
877 |
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changeset
|
878 namespace test_template_argument_deduction_for_class_templates |
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|
879 { |
3 | 880 |
2970
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diff
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|
881 template <typename T1, typename T2> |
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diff
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|
882 struct pair |
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|
883 { |
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bsmith@81767d24-ef19-dc11-ae90-00e081727c95
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diff
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|
884 pair (T1 p1, T2 p2) |
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|
885 : m1 {p1}, |
83c17a84bc27
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|
886 m2 {p2} |
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|
887 {} |
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|
888 |
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diff
changeset
|
889 T1 m1; |
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|
890 T2 m2; |
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|
891 }; |
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|
892 |
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|
893 void f() |
83c17a84bc27
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diff
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|
894 { |
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diff
changeset
|
895 [[maybe_unused]] auto p = pair{13, 42u}; |
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896 } |
3 | 897 |
2970
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|
898 } |
83c17a84bc27
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diff
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|
899 |
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diff
changeset
|
900 namespace test_non_type_auto_template_parameters |
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|
901 { |
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|
902 |
83c17a84bc27
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diff
changeset
|
903 template <auto n> |
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diff
changeset
|
904 struct B |
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|
905 {}; |
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|
906 |
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|
907 B<5> b1; |
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908 B<'a'> b2; |
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909 |
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910 } |
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911 |
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912 namespace test_structured_bindings |
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913 { |
3 | 914 |
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915 int arr[2] = { 1, 2 }; |
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916 std::pair<int, int> pr = { 1, 2 }; |
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917 |
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918 auto f1() -> int(&)[2] |
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919 { |
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920 return arr; |
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921 } |
3 | 922 |
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923 auto f2() -> std::pair<int, int>& |
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924 { |
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925 return pr; |
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926 } |
3 | 927 |
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|
928 struct S |
3 | 929 { |
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930 int x1 : 2; |
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|
931 volatile double y1; |
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932 }; |
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933 |
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|
934 S f3() |
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935 { |
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936 return {}; |
3 | 937 } |
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938 |
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939 auto [ x1, y1 ] = f1(); |
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940 auto& [ xr1, yr1 ] = f1(); |
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941 auto [ x2, y2 ] = f2(); |
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942 auto& [ xr2, yr2 ] = f2(); |
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943 const auto [ x3, y3 ] = f3(); |
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944 |
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945 } |
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946 |
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947 namespace test_exception_spec_type_system |
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948 { |
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949 |
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950 struct Good {}; |
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951 struct Bad {}; |
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952 |
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953 void g1() noexcept; |
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954 void g2(); |
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955 |
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956 template<typename T> |
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957 Bad |
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958 f(T*, T*); |
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959 |
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960 template<typename T1, typename T2> |
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961 Good |
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962 f(T1*, T2*); |
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963 |
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964 static_assert (std::is_same_v<Good, decltype(f(g1, g2))>); |
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965 |
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966 } |
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967 |
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968 namespace test_inline_variables |
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969 { |
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970 |
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971 template<class T> void f(T) |
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972 {} |
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973 |
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974 template<class T> inline T g(T) |
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975 { |
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976 return T{}; |
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977 } |
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|
978 |
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979 template<> inline void f<>(int) |
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980 {} |
3 | 981 |
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982 template<> int g<>(int) |
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983 { |
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984 return 5; |
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985 } |
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986 |
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987 } |
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|
988 |
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989 } // namespace cxx17 |
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|
990 |
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991 #endif // __cplusplus < 201703L && !defined _MSC_VER |
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992 |
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|
993 ]]) |
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|
994 |
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|
995 |
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|
996 dnl Tests for new features in C++20 |
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|
997 |
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998 m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_20], [[ |
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|
999 |
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1000 #ifndef __cplusplus |
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1001 |
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1002 #error "This is not a C++ compiler" |
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1003 |
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1004 #elif __cplusplus < 202002L && !defined _MSC_VER |
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1005 |
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1006 #error "This is not a C++20 compiler" |
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1007 |
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1008 #else |
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1009 |
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|
1010 #include <version> |
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1011 |
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1012 namespace cxx20 |
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1013 { |
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1014 |
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1015 // As C++20 supports feature test macros in the standard, there is no |
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1016 // immediate need to actually test for feature availability on the |
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1017 // Autoconf side. |
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1018 |
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1019 } // namespace cxx20 |
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1020 |
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1021 #endif // __cplusplus < 202002L && !defined _MSC_VER |
83c17a84bc27
Update the configure scripts with the latest autotools.
bsmith@81767d24-ef19-dc11-ae90-00e081727c95
parents:
3
diff
changeset
|
1022 |
83c17a84bc27
Update the configure scripts with the latest autotools.
bsmith@81767d24-ef19-dc11-ae90-00e081727c95
parents:
3
diff
changeset
|
1023 ]]) |
83c17a84bc27
Update the configure scripts with the latest autotools.
bsmith@81767d24-ef19-dc11-ae90-00e081727c95
parents:
3
diff
changeset
|
1024 |