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##### http://autoconf-archive.cryp.to/ac_cxx_have_ext_hash_map.html
#
# SYNOPSIS
#
# AC_CXX_HAVE_EXT_HASH_MAP
#
# DESCRIPTION
#
# Check if the compiler has ext/hash_map Eg:
#
# #if defined(HAVE_EXT_HASH_MAP)
# #include <ext/hash_map>
# #else
# #if defined(HAVE_STL)
# #include <hash_map>
# #else
# # Can't find hash_map header !
# #endif
# #endif
#
# This file is Alain BARBET's AC_CXX_HAVE_EXT_HASH_SET 1.1 with
# s/set/map/g :)
#
# LAST MODIFICATION
#
# 2002-09-25
#
# COPYLEFT
#
# Copyright (c) 2002 Perceval ANICHINI <perceval.anichini@epita.fr>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
#
# As a special exception, the respective Autoconf Macro's copyright
# owner gives unlimited permission to copy, distribute and modify the
# configure scripts that are the output of Autoconf when processing
# the Macro. You need not follow the terms of the GNU General Public
# License when using or distributing such scripts, even though
# portions of the text of the Macro appear in them. The GNU General
# Public License (GPL) does govern all other use of the material that
# constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the
# Autoconf Macro released by the Autoconf Macro Archive. When you
# make and distribute a modified version of the Autoconf Macro, you
# may extend this special exception to the GPL to apply to your
# modified version as well.
AC_DEFUN([AC_CXX_HAVE_EXT_HASH_MAP],
[AC_CACHE_CHECK(whether the compiler has ext/hash_map,
ac_cv_cxx_have_ext_hash_map,
[AC_REQUIRE([AC_CXX_NAMESPACES])
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([#include <ext/hash_map>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif],[hash_map<int, int> t; return 0;],
ac_cv_cxx_have_ext_hash_map=yes, ac_cv_cxx_have_ext_hash_map=no)
AC_LANG_RESTORE
])
if test "$ac_cv_cxx_have_ext_hash_map" = yes; then
AC_DEFINE(HAVE_EXT_HASH_MAP,,[define if the compiler has ext/hash_map])
fi
])
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