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# ===========================================================================
# http://autoconf-archive.cryp.to/ac_cxx_header_tr1_unordered_map.html
# ===========================================================================
#
# SYNOPSIS
#
# AC_CXX_HEADER_TR1_UNORDERED_MAP
#
# DESCRIPTION
#
# Check whether the TR1 include <unordered_map> exists and define
# HAVE_TR1_UNORDERED_MAP if it does.
#
# LAST MODIFICATION
#
# 2008-04-17
#
# COPYLEFT
#
# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
#
# 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_HEADER_TR1_UNORDERED_MAP], [
AC_CACHE_CHECK(for tr1/unordered_map,
ac_cv_cxx_tr1_unordered_map,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([#include <tr1/unordered_map>], [using std::tr1::unordered_map;],
ac_cv_cxx_tr1_unordered_map=yes, ac_cv_cxx_tr1_unordered_map=no)
AC_LANG_RESTORE
])
if test "$ac_cv_cxx_tr1_unordered_map" = yes; then
AC_DEFINE(HAVE_TR1_UNORDERED_MAP,,[Define if tr1/unordered_map is present. ])
fi
])
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