qse/m4/ax_cxx_namespace.m4

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dnl @synopsis AX_CXX_NAMESPACE_STD
dnl
dnl If the compiler supports namespace std, define
dnl HAVE_CXX_NAMESPACE_STD.
dnl
dnl @category Cxx
dnl @author Todd Veldhuizen
dnl @author Luc Maisonobe <luc@spaceroots.org>
dnl @version 2004-02-04
dnl @license AllPermissive
AC_DEFUN([AX_CXX_NAMESPACE_STD], [
AC_CACHE_CHECK(if c++ supports namespace std,
ax_cv_cxx_have_std_namespace,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([#include <iostream>
std::istream& is = std::cin;],,
ax_cv_cxx_have_std_namespace=yes, ax_cv_cxx_have_std_namespace=no)
AC_LANG_RESTORE
])
if test "$ax_cv_cxx_have_std_namespace" = yes; then
AC_DEFINE(HAVE_CXX_NAMESPACE_STD,,[Define if c++ supports namespace std. ])
fi
])