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# ================================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_header_unordered_set.html
# ================================================================================
#
# SYNOPSIS
#
# AX_CXX_HEADER_UNORDERED_SET
#
# DESCRIPTION
#
# Check whether the C++ include <unordered_set> exists and define
# HAVE_UNORDERED_SET if it does.
#
# LICENSE
#
# 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. This file is offered as-is, without any
# warranty.
#serial 8
AU_ALIAS([AC_CXX_HEADER_UNORDERED_SET], [AX_CXX_HEADER_UNORDERED_SET])
AC_DEFUN([AX_CXX_HEADER_UNORDERED_SET], [
AC_CACHE_CHECK(for unordered_set,
ax_cv_cxx_unordered_set,
[AC_REQUIRE([AC_COMPILE_STDCXX_0X])
AC_LANG_PUSH([C++])
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -std=gnu++0x"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unordered_set>]],
[[using std::unordered_set;]])],
[ax_cv_cxx_unordered_set=yes], [ax_cv_cxx_unordered_set=no])
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_POP([C++])
])
if test "$ax_cv_cxx_unordered_set" = yes; then
AC_DEFINE(HAVE_UNORDERED_SET,,[Define if unordered_set is present. ])
fi
])
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