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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_namespace_std.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CXX_NAMESPACE_STD
#
# DESCRIPTION
#
# If the compiler supports namespace std, define HAVE_NAMESPACE_STD.
#
# LICENSE
#
# Copyright (c) 2009 Todd Veldhuizen
# Copyright (c) 2009 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 8
AU_ALIAS([AC_CXX_NAMESPACE_STD], [AX_CXX_NAMESPACE_STD])
AC_DEFUN([AX_CXX_NAMESPACE_STD], [
AC_CACHE_CHECK(if g++ supports namespace std,
ax_cv_cxx_have_std_namespace,
[AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <iostream>
std::istream& is = std::cin;]], [])],
[ax_cv_cxx_have_std_namespace=yes], [ax_cv_cxx_have_std_namespace=no])
AC_LANG_POP([C++])
])
if test "$ax_cv_cxx_have_std_namespace" = yes; then
AC_DEFINE(HAVE_NAMESPACE_STD,,[Define if g++ supports namespace std. ])
fi
])
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