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+# ===========================================================================
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+# https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
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+# ===========================================================================
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+#
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+# SYNOPSIS
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+#
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+# AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional])
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+#
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+# DESCRIPTION
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+#
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+# Check for baseline language coverage in the compiler for the specified
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+# version of the C++ standard. If necessary, add switches to CXX and
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+# CXXCPP to enable support. VERSION may be '11', '14', '17', or '20' for
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+# the respective C++ standard version.
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+#
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+# The second argument, if specified, indicates whether you insist on an
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+# extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
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+# -std=c++11). If neither is specified, you get whatever works, with
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+# preference for no added switch, and then for an extended mode.
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+#
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+# The third argument, if specified 'mandatory' or if left unspecified,
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+# indicates that baseline support for the specified C++ standard is
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+# required and that the macro should error out if no mode with that
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+# support is found. If specified 'optional', then configuration proceeds
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+# regardless, after defining HAVE_CXX${VERSION} if and only if a
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+# supporting mode is found.
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+#
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+# LICENSE
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+#
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+# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
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+# Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
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+# Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
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+# Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
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+# Copyright (c) 2015 Paul Norman <penorman@mac.com>
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+# Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
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+# Copyright (c) 2016, 2018 Krzesimir Nowak <qdlacz@gmail.com>
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+# Copyright (c) 2019 Enji Cooper <yaneurabeya@gmail.com>
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+# Copyright (c) 2020 Jason Merrill <jason@redhat.com>
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+# Copyright (c) 2021 Jörn Heusipp <osmanx@problemloesungsmaschine.de>
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+#
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+# Copying and distribution of this file, with or without modification, are
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+# permitted in any medium without royalty provided the copyright notice
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+# and this notice are preserved. This file is offered as-is, without any
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+# warranty.
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+
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+#serial 18
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+
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+dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
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+dnl (serial version number 13).
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+
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+AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
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+ m4_if([$1], [11], [ax_cxx_compile_alternatives="11 0x"],
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+ [$1], [14], [ax_cxx_compile_alternatives="14 1y"],
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+ [$1], [17], [ax_cxx_compile_alternatives="17 1z"],
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+ [$1], [20], [ax_cxx_compile_alternatives="20"],
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+ [m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
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+ m4_if([$2], [], [],
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+ [$2], [ext], [],
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+ [$2], [noext], [],
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+ [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl
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+ m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true],
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+ [$3], [mandatory], [ax_cxx_compile_cxx$1_required=true],
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+ [$3], [optional], [ax_cxx_compile_cxx$1_required=false],
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+ [m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])])
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+ AC_LANG_PUSH([C++])dnl
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+ ac_success=no
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+
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+ m4_if([$2], [], [dnl
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+ AC_CACHE_CHECK(whether $CXX supports C++$1 features by default,
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+ ax_cv_cxx_compile_cxx$1,
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+ [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
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+ [ax_cv_cxx_compile_cxx$1=yes],
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+ [ax_cv_cxx_compile_cxx$1=no])])
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+ if test x$ax_cv_cxx_compile_cxx$1 = xyes; then
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+ ac_success=yes
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+ fi])
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+
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+ m4_if([$2], [noext], [], [dnl
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+ if test x$ac_success = xno; then
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+ for alternative in ${ax_cxx_compile_alternatives}; do
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+ switch="-std=gnu++${alternative}"
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+ cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
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+ AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
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+ $cachevar,
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+ [ac_save_CXX="$CXX"
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+ CXX="$CXX $switch"
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+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
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+ [eval $cachevar=yes],
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+ [eval $cachevar=no])
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+ CXX="$ac_save_CXX"])
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+ if eval test x\$$cachevar = xyes; then
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+ CXX="$CXX $switch"
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+ if test -n "$CXXCPP" ; then
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+ CXXCPP="$CXXCPP $switch"
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+ fi
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+ ac_success=yes
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+ break
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+ fi
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+ done
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+ fi])
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+
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+ m4_if([$2], [ext], [], [dnl
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+ if test x$ac_success = xno; then
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+ dnl HP's aCC needs +std=c++11 according to:
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+ dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
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+ dnl Cray's crayCC needs "-h std=c++11"
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+ dnl MSVC needs -std:c++NN for C++17 and later (default is C++14)
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+ for alternative in ${ax_cxx_compile_alternatives}; do
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+ for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}" MSVC; do
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+ if test x"$switch" = xMSVC; then
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+ dnl AS_TR_SH maps both `:` and `=` to `_` so -std:c++17 would collide
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+ dnl with -std=c++17. We suffix the cache variable name with _MSVC to
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+ dnl avoid this.
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+ switch=-std:c++${alternative}
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+ cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_${switch}_MSVC])
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+ else
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+ cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
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+ fi
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+ AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
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+ $cachevar,
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+ [ac_save_CXX="$CXX"
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+ CXX="$CXX $switch"
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+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
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+ [eval $cachevar=yes],
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+ [eval $cachevar=no])
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+ CXX="$ac_save_CXX"])
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+ if eval test x\$$cachevar = xyes; then
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+ CXX="$CXX $switch"
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+ if test -n "$CXXCPP" ; then
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+ CXXCPP="$CXXCPP $switch"
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+ fi
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+ ac_success=yes
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+ break
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+ fi
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+ done
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+ if test x$ac_success = xyes; then
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+ break
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+ fi
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+ done
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+ fi])
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+ AC_LANG_POP([C++])
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+ if test x$ax_cxx_compile_cxx$1_required = xtrue; then
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+ if test x$ac_success = xno; then
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+ AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.])
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+ fi
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+ fi
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+ if test x$ac_success = xno; then
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+ HAVE_CXX$1=0
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+ AC_MSG_NOTICE([No compiler with C++$1 support was found])
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+ else
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+ HAVE_CXX$1=1
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+ AC_DEFINE(HAVE_CXX$1,1,
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+ [define if the compiler supports basic C++$1 syntax])
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+ fi
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+ AC_SUBST(HAVE_CXX$1)
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+])
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+
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+
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+dnl Test body for checking C++11 support
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+
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+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11],
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+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
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+)
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+
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+dnl Test body for checking C++14 support
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+
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+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
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+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
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+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_14
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+)
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+
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+dnl Test body for checking C++17 support
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+
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+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_17],
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+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
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+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_14
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+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_17
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+)
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+
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+dnl Test body for checking C++20 support
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+
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+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_20],
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+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
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+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_14
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+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_17
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+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_20
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+)
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+
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+
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+dnl Tests for new features in C++11
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+
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+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
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+
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+// If the compiler admits that it is not ready for C++11, why torture it?
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+// Hopefully, this will speed up the test.
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+
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+#ifndef __cplusplus
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+
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+#error "This is not a C++ compiler"
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+
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+// MSVC always sets __cplusplus to 199711L in older versions; newer versions
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+// only set it correctly if /Zc:__cplusplus is specified as well as a
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+// /std:c++NN switch:
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+// https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/
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+#elif __cplusplus < 201103L && !defined _MSC_VER
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+
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+#error "This is not a C++11 compiler"
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+
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+#else
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+
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+namespace cxx11
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+{
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+
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+ namespace test_static_assert
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+ {
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+
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+ template <typename T>
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+ struct check
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+ {
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+ static_assert(sizeof(int) <= sizeof(T), "not big enough");
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+ };
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+
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+ }
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+
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+ namespace test_final_override
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+ {
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+
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+ struct Base
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+ {
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+ virtual ~Base() {}
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+ virtual void f() {}
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+ };
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+
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+ struct Derived : public Base
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+ {
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+ virtual ~Derived() override {}
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+ virtual void f() override {}
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+ };
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+
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+ }
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+
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+ namespace test_double_right_angle_brackets
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+ {
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+
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+ template < typename T >
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+ struct check {};
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+
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+ typedef check<void> single_type;
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+ typedef check<check<void>> double_type;
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+ typedef check<check<check<void>>> triple_type;
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+ typedef check<check<check<check<void>>>> quadruple_type;
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+
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+ }
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+
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+ namespace test_decltype
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+ {
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+
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+ int
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+ f()
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+ {
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+ int a = 1;
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+ decltype(a) b = 2;
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+ return a + b;
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+ }
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+
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+ }
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+
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+ namespace test_type_deduction
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+ {
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+
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+ template < typename T1, typename T2 >
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+ struct is_same
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+ {
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+ static const bool value = false;
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+ };
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+
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+ template < typename T >
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+ struct is_same<T, T>
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+ {
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+ static const bool value = true;
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+ };
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+
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+ template < typename T1, typename T2 >
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+ auto
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+ add(T1 a1, T2 a2) -> decltype(a1 + a2)
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+ {
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+ return a1 + a2;
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+ }
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+
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+ int
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+ test(const int c, volatile int v)
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+ {
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+ static_assert(is_same<int, decltype(0)>::value == true, "");
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+ static_assert(is_same<int, decltype(c)>::value == false, "");
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+ static_assert(is_same<int, decltype(v)>::value == false, "");
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+ auto ac = c;
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+ auto av = v;
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+ auto sumi = ac + av + 'x';
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+ auto sumf = ac + av + 1.0;
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+ static_assert(is_same<int, decltype(ac)>::value == true, "");
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+ static_assert(is_same<int, decltype(av)>::value == true, "");
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+ static_assert(is_same<int, decltype(sumi)>::value == true, "");
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+ static_assert(is_same<int, decltype(sumf)>::value == false, "");
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+ static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
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+ return (sumf > 0.0) ? sumi : add(c, v);
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+ }
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+
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+ }
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+
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+ namespace test_noexcept
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+ {
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+
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+ int f() { return 0; }
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+ int g() noexcept { return 0; }
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+
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+ static_assert(noexcept(f()) == false, "");
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+ static_assert(noexcept(g()) == true, "");
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+
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+ }
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+
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+ namespace test_constexpr
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+ {
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+
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+ template < typename CharT >
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+ unsigned long constexpr
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+ strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
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+ {
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+ return *s ? strlen_c_r(s + 1, acc + 1) : acc;
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+ }
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+
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+ template < typename CharT >
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+ unsigned long constexpr
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+ strlen_c(const CharT *const s) noexcept
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+ {
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+ return strlen_c_r(s, 0UL);
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+ }
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+
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+ static_assert(strlen_c("") == 0UL, "");
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+ static_assert(strlen_c("1") == 1UL, "");
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+ static_assert(strlen_c("example") == 7UL, "");
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+ static_assert(strlen_c("another\0example") == 7UL, "");
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+
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+ }
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+
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+ namespace test_rvalue_references
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+ {
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+
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+ template < int N >
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+ struct answer
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+ {
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+ static constexpr int value = N;
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+ };
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+
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+ answer<1> f(int&) { return answer<1>(); }
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+ answer<2> f(const int&) { return answer<2>(); }
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+ answer<3> f(int&&) { return answer<3>(); }
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+
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+ void
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+ test()
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+ {
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+ int i = 0;
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+ const int c = 0;
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+ static_assert(decltype(f(i))::value == 1, "");
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+ static_assert(decltype(f(c))::value == 2, "");
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+ static_assert(decltype(f(0))::value == 3, "");
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+ }
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+
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+ }
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+
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+ namespace test_uniform_initialization
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+ {
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+
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+ struct test
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+ {
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+ static const int zero {};
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+ static const int one {1};
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+ };
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+
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+ static_assert(test::zero == 0, "");
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+ static_assert(test::one == 1, "");
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+
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+ }
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+
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+ namespace test_lambdas
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+ {
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+
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+ void
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+ test1()
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+ {
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+ auto lambda1 = [](){};
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+ auto lambda2 = lambda1;
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+ lambda1();
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+ lambda2();
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+ }
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+
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+ int
|
|
|
+ test2()
|
|
|
+ {
|
|
|
+ auto a = [](int i, int j){ return i + j; }(1, 2);
|
|
|
+ auto b = []() -> int { return '0'; }();
|
|
|
+ auto c = [=](){ return a + b; }();
|
|
|
+ auto d = [&](){ return c; }();
|
|
|
+ auto e = [a, &b](int x) mutable {
|
|
|
+ const auto identity = [](int y){ return y; };
|
|
|
+ for (auto i = 0; i < a; ++i)
|
|
|
+ a += b--;
|
|
|
+ return x + identity(a + b);
|
|
|
+ }(0);
|
|
|
+ return a + b + c + d + e;
|
|
|
+ }
|
|
|
+
|
|
|
+ int
|
|
|
+ test3()
|
|
|
+ {
|
|
|
+ const auto nullary = [](){ return 0; };
|
|
|
+ const auto unary = [](int x){ return x; };
|
|
|
+ using nullary_t = decltype(nullary);
|
|
|
+ using unary_t = decltype(unary);
|
|
|
+ const auto higher1st = [](nullary_t f){ return f(); };
|
|
|
+ const auto higher2nd = [unary](nullary_t f1){
|
|
|
+ return [unary, f1](unary_t f2){ return f2(unary(f1())); };
|
|
|
+ };
|
|
|
+ return higher1st(nullary) + higher2nd(nullary)(unary);
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_variadic_templates
|
|
|
+ {
|
|
|
+
|
|
|
+ template <int...>
|
|
|
+ struct sum;
|
|
|
+
|
|
|
+ template <int N0, int... N1toN>
|
|
|
+ struct sum<N0, N1toN...>
|
|
|
+ {
|
|
|
+ static constexpr auto value = N0 + sum<N1toN...>::value;
|
|
|
+ };
|
|
|
+
|
|
|
+ template <>
|
|
|
+ struct sum<>
|
|
|
+ {
|
|
|
+ static constexpr auto value = 0;
|
|
|
+ };
|
|
|
+
|
|
|
+ static_assert(sum<>::value == 0, "");
|
|
|
+ static_assert(sum<1>::value == 1, "");
|
|
|
+ static_assert(sum<23>::value == 23, "");
|
|
|
+ static_assert(sum<1, 2>::value == 3, "");
|
|
|
+ static_assert(sum<5, 5, 11>::value == 21, "");
|
|
|
+ static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
|
|
|
+ // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
|
|
|
+ // because of this.
|
|
|
+ namespace test_template_alias_sfinae
|
|
|
+ {
|
|
|
+
|
|
|
+ struct foo {};
|
|
|
+
|
|
|
+ template<typename T>
|
|
|
+ using member = typename T::member_type;
|
|
|
+
|
|
|
+ template<typename T>
|
|
|
+ void func(...) {}
|
|
|
+
|
|
|
+ template<typename T>
|
|
|
+ void func(member<T>*) {}
|
|
|
+
|
|
|
+ void test();
|
|
|
+
|
|
|
+ void test() { func<foo>(0); }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+} // namespace cxx11
|
|
|
+
|
|
|
+#endif // __cplusplus >= 201103L
|
|
|
+
|
|
|
+]])
|
|
|
+
|
|
|
+
|
|
|
+dnl Tests for new features in C++14
|
|
|
+
|
|
|
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[
|
|
|
+
|
|
|
+// If the compiler admits that it is not ready for C++14, why torture it?
|
|
|
+// Hopefully, this will speed up the test.
|
|
|
+
|
|
|
+#ifndef __cplusplus
|
|
|
+
|
|
|
+#error "This is not a C++ compiler"
|
|
|
+
|
|
|
+#elif __cplusplus < 201402L && !defined _MSC_VER
|
|
|
+
|
|
|
+#error "This is not a C++14 compiler"
|
|
|
+
|
|
|
+#else
|
|
|
+
|
|
|
+namespace cxx14
|
|
|
+{
|
|
|
+
|
|
|
+ namespace test_polymorphic_lambdas
|
|
|
+ {
|
|
|
+
|
|
|
+ int
|
|
|
+ test()
|
|
|
+ {
|
|
|
+ const auto lambda = [](auto&&... args){
|
|
|
+ const auto istiny = [](auto x){
|
|
|
+ return (sizeof(x) == 1UL) ? 1 : 0;
|
|
|
+ };
|
|
|
+ const int aretiny[] = { istiny(args)... };
|
|
|
+ return aretiny[0];
|
|
|
+ };
|
|
|
+ return lambda(1, 1L, 1.0f, '1');
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_binary_literals
|
|
|
+ {
|
|
|
+
|
|
|
+ constexpr auto ivii = 0b0000000000101010;
|
|
|
+ static_assert(ivii == 42, "wrong value");
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_generalized_constexpr
|
|
|
+ {
|
|
|
+
|
|
|
+ template < typename CharT >
|
|
|
+ constexpr unsigned long
|
|
|
+ strlen_c(const CharT *const s) noexcept
|
|
|
+ {
|
|
|
+ auto length = 0UL;
|
|
|
+ for (auto p = s; *p; ++p)
|
|
|
+ ++length;
|
|
|
+ return length;
|
|
|
+ }
|
|
|
+
|
|
|
+ static_assert(strlen_c("") == 0UL, "");
|
|
|
+ static_assert(strlen_c("x") == 1UL, "");
|
|
|
+ static_assert(strlen_c("test") == 4UL, "");
|
|
|
+ static_assert(strlen_c("another\0test") == 7UL, "");
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_lambda_init_capture
|
|
|
+ {
|
|
|
+
|
|
|
+ int
|
|
|
+ test()
|
|
|
+ {
|
|
|
+ auto x = 0;
|
|
|
+ const auto lambda1 = [a = x](int b){ return a + b; };
|
|
|
+ const auto lambda2 = [a = lambda1(x)](){ return a; };
|
|
|
+ return lambda2();
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_digit_separators
|
|
|
+ {
|
|
|
+
|
|
|
+ constexpr auto ten_million = 100'000'000;
|
|
|
+ static_assert(ten_million == 100000000, "");
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_return_type_deduction
|
|
|
+ {
|
|
|
+
|
|
|
+ auto f(int& x) { return x; }
|
|
|
+ decltype(auto) g(int& x) { return x; }
|
|
|
+
|
|
|
+ template < typename T1, typename T2 >
|
|
|
+ struct is_same
|
|
|
+ {
|
|
|
+ static constexpr auto value = false;
|
|
|
+ };
|
|
|
+
|
|
|
+ template < typename T >
|
|
|
+ struct is_same<T, T>
|
|
|
+ {
|
|
|
+ static constexpr auto value = true;
|
|
|
+ };
|
|
|
+
|
|
|
+ int
|
|
|
+ test()
|
|
|
+ {
|
|
|
+ auto x = 0;
|
|
|
+ static_assert(is_same<int, decltype(f(x))>::value, "");
|
|
|
+ static_assert(is_same<int&, decltype(g(x))>::value, "");
|
|
|
+ return x;
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+} // namespace cxx14
|
|
|
+
|
|
|
+#endif // __cplusplus >= 201402L
|
|
|
+
|
|
|
+]])
|
|
|
+
|
|
|
+
|
|
|
+dnl Tests for new features in C++17
|
|
|
+
|
|
|
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_17], [[
|
|
|
+
|
|
|
+// If the compiler admits that it is not ready for C++17, why torture it?
|
|
|
+// Hopefully, this will speed up the test.
|
|
|
+
|
|
|
+#ifndef __cplusplus
|
|
|
+
|
|
|
+#error "This is not a C++ compiler"
|
|
|
+
|
|
|
+#elif __cplusplus < 201703L && !defined _MSC_VER
|
|
|
+
|
|
|
+#error "This is not a C++17 compiler"
|
|
|
+
|
|
|
+#else
|
|
|
+
|
|
|
+#include <initializer_list>
|
|
|
+#include <utility>
|
|
|
+#include <type_traits>
|
|
|
+
|
|
|
+namespace cxx17
|
|
|
+{
|
|
|
+
|
|
|
+ namespace test_constexpr_lambdas
|
|
|
+ {
|
|
|
+
|
|
|
+ constexpr int foo = [](){return 42;}();
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test::nested_namespace::definitions
|
|
|
+ {
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_fold_expression
|
|
|
+ {
|
|
|
+
|
|
|
+ template<typename... Args>
|
|
|
+ int multiply(Args... args)
|
|
|
+ {
|
|
|
+ return (args * ... * 1);
|
|
|
+ }
|
|
|
+
|
|
|
+ template<typename... Args>
|
|
|
+ bool all(Args... args)
|
|
|
+ {
|
|
|
+ return (args && ...);
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_extended_static_assert
|
|
|
+ {
|
|
|
+
|
|
|
+ static_assert (true);
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_auto_brace_init_list
|
|
|
+ {
|
|
|
+
|
|
|
+ auto foo = {5};
|
|
|
+ auto bar {5};
|
|
|
+
|
|
|
+ static_assert(std::is_same<std::initializer_list<int>, decltype(foo)>::value);
|
|
|
+ static_assert(std::is_same<int, decltype(bar)>::value);
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_typename_in_template_template_parameter
|
|
|
+ {
|
|
|
+
|
|
|
+ template<template<typename> typename X> struct D;
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_fallthrough_nodiscard_maybe_unused_attributes
|
|
|
+ {
|
|
|
+
|
|
|
+ int f1()
|
|
|
+ {
|
|
|
+ return 42;
|
|
|
+ }
|
|
|
+
|
|
|
+ [[nodiscard]] int f2()
|
|
|
+ {
|
|
|
+ [[maybe_unused]] auto unused = f1();
|
|
|
+
|
|
|
+ switch (f1())
|
|
|
+ {
|
|
|
+ case 17:
|
|
|
+ f1();
|
|
|
+ [[fallthrough]];
|
|
|
+ case 42:
|
|
|
+ f1();
|
|
|
+ }
|
|
|
+ return f1();
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_extended_aggregate_initialization
|
|
|
+ {
|
|
|
+
|
|
|
+ struct base1
|
|
|
+ {
|
|
|
+ int b1, b2 = 42;
|
|
|
+ };
|
|
|
+
|
|
|
+ struct base2
|
|
|
+ {
|
|
|
+ base2() {
|
|
|
+ b3 = 42;
|
|
|
+ }
|
|
|
+ int b3;
|
|
|
+ };
|
|
|
+
|
|
|
+ struct derived : base1, base2
|
|
|
+ {
|
|
|
+ int d;
|
|
|
+ };
|
|
|
+
|
|
|
+ derived d1 {{1, 2}, {}, 4}; // full initialization
|
|
|
+ derived d2 {{}, {}, 4}; // value-initialized bases
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_general_range_based_for_loop
|
|
|
+ {
|
|
|
+
|
|
|
+ struct iter
|
|
|
+ {
|
|
|
+ int i;
|
|
|
+
|
|
|
+ int& operator* ()
|
|
|
+ {
|
|
|
+ return i;
|
|
|
+ }
|
|
|
+
|
|
|
+ const int& operator* () const
|
|
|
+ {
|
|
|
+ return i;
|
|
|
+ }
|
|
|
+
|
|
|
+ iter& operator++()
|
|
|
+ {
|
|
|
+ ++i;
|
|
|
+ return *this;
|
|
|
+ }
|
|
|
+ };
|
|
|
+
|
|
|
+ struct sentinel
|
|
|
+ {
|
|
|
+ int i;
|
|
|
+ };
|
|
|
+
|
|
|
+ bool operator== (const iter& i, const sentinel& s)
|
|
|
+ {
|
|
|
+ return i.i == s.i;
|
|
|
+ }
|
|
|
+
|
|
|
+ bool operator!= (const iter& i, const sentinel& s)
|
|
|
+ {
|
|
|
+ return !(i == s);
|
|
|
+ }
|
|
|
+
|
|
|
+ struct range
|
|
|
+ {
|
|
|
+ iter begin() const
|
|
|
+ {
|
|
|
+ return {0};
|
|
|
+ }
|
|
|
+
|
|
|
+ sentinel end() const
|
|
|
+ {
|
|
|
+ return {5};
|
|
|
+ }
|
|
|
+ };
|
|
|
+
|
|
|
+ void f()
|
|
|
+ {
|
|
|
+ range r {};
|
|
|
+
|
|
|
+ for (auto i : r)
|
|
|
+ {
|
|
|
+ [[maybe_unused]] auto v = i;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_lambda_capture_asterisk_this_by_value
|
|
|
+ {
|
|
|
+
|
|
|
+ struct t
|
|
|
+ {
|
|
|
+ int i;
|
|
|
+ int foo()
|
|
|
+ {
|
|
|
+ return [*this]()
|
|
|
+ {
|
|
|
+ return i;
|
|
|
+ }();
|
|
|
+ }
|
|
|
+ };
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_enum_class_construction
|
|
|
+ {
|
|
|
+
|
|
|
+ enum class byte : unsigned char
|
|
|
+ {};
|
|
|
+
|
|
|
+ byte foo {42};
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_constexpr_if
|
|
|
+ {
|
|
|
+
|
|
|
+ template <bool cond>
|
|
|
+ int f ()
|
|
|
+ {
|
|
|
+ if constexpr(cond)
|
|
|
+ {
|
|
|
+ return 13;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ return 42;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_selection_statement_with_initializer
|
|
|
+ {
|
|
|
+
|
|
|
+ int f()
|
|
|
+ {
|
|
|
+ return 13;
|
|
|
+ }
|
|
|
+
|
|
|
+ int f2()
|
|
|
+ {
|
|
|
+ if (auto i = f(); i > 0)
|
|
|
+ {
|
|
|
+ return 3;
|
|
|
+ }
|
|
|
+
|
|
|
+ switch (auto i = f(); i + 4)
|
|
|
+ {
|
|
|
+ case 17:
|
|
|
+ return 2;
|
|
|
+
|
|
|
+ default:
|
|
|
+ return 1;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_template_argument_deduction_for_class_templates
|
|
|
+ {
|
|
|
+
|
|
|
+ template <typename T1, typename T2>
|
|
|
+ struct pair
|
|
|
+ {
|
|
|
+ pair (T1 p1, T2 p2)
|
|
|
+ : m1 {p1},
|
|
|
+ m2 {p2}
|
|
|
+ {}
|
|
|
+
|
|
|
+ T1 m1;
|
|
|
+ T2 m2;
|
|
|
+ };
|
|
|
+
|
|
|
+ void f()
|
|
|
+ {
|
|
|
+ [[maybe_unused]] auto p = pair{13, 42u};
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_non_type_auto_template_parameters
|
|
|
+ {
|
|
|
+
|
|
|
+ template <auto n>
|
|
|
+ struct B
|
|
|
+ {};
|
|
|
+
|
|
|
+ B<5> b1;
|
|
|
+ B<'a'> b2;
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_structured_bindings
|
|
|
+ {
|
|
|
+
|
|
|
+ int arr[2] = { 1, 2 };
|
|
|
+ std::pair<int, int> pr = { 1, 2 };
|
|
|
+
|
|
|
+ auto f1() -> int(&)[2]
|
|
|
+ {
|
|
|
+ return arr;
|
|
|
+ }
|
|
|
+
|
|
|
+ auto f2() -> std::pair<int, int>&
|
|
|
+ {
|
|
|
+ return pr;
|
|
|
+ }
|
|
|
+
|
|
|
+ struct S
|
|
|
+ {
|
|
|
+ int x1 : 2;
|
|
|
+ volatile double y1;
|
|
|
+ };
|
|
|
+
|
|
|
+ S f3()
|
|
|
+ {
|
|
|
+ return {};
|
|
|
+ }
|
|
|
+
|
|
|
+ auto [ x1, y1 ] = f1();
|
|
|
+ auto& [ xr1, yr1 ] = f1();
|
|
|
+ auto [ x2, y2 ] = f2();
|
|
|
+ auto& [ xr2, yr2 ] = f2();
|
|
|
+ const auto [ x3, y3 ] = f3();
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_exception_spec_type_system
|
|
|
+ {
|
|
|
+
|
|
|
+ struct Good {};
|
|
|
+ struct Bad {};
|
|
|
+
|
|
|
+ void g1() noexcept;
|
|
|
+ void g2();
|
|
|
+
|
|
|
+ template<typename T>
|
|
|
+ Bad
|
|
|
+ f(T*, T*);
|
|
|
+
|
|
|
+ template<typename T1, typename T2>
|
|
|
+ Good
|
|
|
+ f(T1*, T2*);
|
|
|
+
|
|
|
+ static_assert (std::is_same_v<Good, decltype(f(g1, g2))>);
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ namespace test_inline_variables
|
|
|
+ {
|
|
|
+
|
|
|
+ template<class T> void f(T)
|
|
|
+ {}
|
|
|
+
|
|
|
+ template<class T> inline T g(T)
|
|
|
+ {
|
|
|
+ return T{};
|
|
|
+ }
|
|
|
+
|
|
|
+ template<> inline void f<>(int)
|
|
|
+ {}
|
|
|
+
|
|
|
+ template<> int g<>(int)
|
|
|
+ {
|
|
|
+ return 5;
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+} // namespace cxx17
|
|
|
+
|
|
|
+#endif // __cplusplus < 201703L && !defined _MSC_VER
|
|
|
+
|
|
|
+]])
|
|
|
+
|
|
|
+
|
|
|
+dnl Tests for new features in C++20
|
|
|
+
|
|
|
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_20], [[
|
|
|
+
|
|
|
+#ifndef __cplusplus
|
|
|
+
|
|
|
+#error "This is not a C++ compiler"
|
|
|
+
|
|
|
+#elif __cplusplus < 202002L && !defined _MSC_VER
|
|
|
+
|
|
|
+#error "This is not a C++20 compiler"
|
|
|
+
|
|
|
+#else
|
|
|
+
|
|
|
+#include <version>
|
|
|
+
|
|
|
+namespace cxx20
|
|
|
+{
|
|
|
+
|
|
|
+// As C++20 supports feature test macros in the standard, there is no
|
|
|
+// immediate need to actually test for feature availability on the
|
|
|
+// Autoconf side.
|
|
|
+
|
|
|
+} // namespace cxx20
|
|
|
+
|
|
|
+#endif // __cplusplus < 202002L && !defined _MSC_VER
|
|
|
+
|
|
|
+]])
|
Costa Tsaousis