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# ===========================================================================
# http://www.nongnu.org/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.
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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