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# https://www.gnu.org/software/autoconf-archive/ax_cxx_explicit.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CXX_EXPLICIT
#
# DESCRIPTION
#
# If the compiler can be asked to prevent using implicitly one argument
# constructors as converting constructors with the explicit keyword,
# define HAVE_EXPLICIT.
#
# LICENSE
#
# Copyright (c) 2008 Todd Veldhuizen
# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 7
AU_ALIAS([AC_CXX_EXPLICIT], [AX_CXX_EXPLICIT])
AC_DEFUN([AX_CXX_EXPLICIT],
[AC_CACHE_CHECK(whether the compiler supports the explicit keyword,
ax_cv_cxx_explicit,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([class A{public:explicit A(double){}};],
[double c = 5.0;A x(c);return 0;],
ax_cv_cxx_explicit=yes, ax_cv_cxx_explicit=no)
AC_LANG_RESTORE
])
if test "$ax_cv_cxx_explicit" = yes; then
AC_DEFINE(HAVE_EXPLICIT,,[define if the compiler supports the explicit keyword])
fi
])
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