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# ===========================================================================
# http://autoconf-archive.cryp.to/ac_cxx_namespaces.html
# ===========================================================================
#
# SYNOPSIS
#
# AC_CXX_NAMESPACES
#
# DESCRIPTION
#
# If the compiler can prevent names clashes using namespaces, define
# HAVE_NAMESPACES.
#
# LAST MODIFICATION
#
# 2008-04-12
#
# COPYLEFT
#
# 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([AC_CXX_NAMESPACES],
[AC_CACHE_CHECK(whether the compiler implements namespaces,
ac_cv_cxx_namespaces,
[AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[namespace Outer { namespace Inner { int i = 0; }}]],
[[using namespace Outer::Inner; return i;]])],
[ac_cv_cxx_namespaces=yes], [ac_cv_cxx_namespaces=no])
AC_LANG_POP([])
])
if test "$ac_cv_cxx_namespaces" = yes; then
AC_DEFINE(HAVE_NAMESPACES, 1,
[defined to 1 if the compiler implements namespaces, 0 otherwise])
else
AC_DEFINE(HAVE_NAMESPACES, 0,
[defined to 1 if the compiler implements namespaces, 0 otherwise])
fi
])
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