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# ===========================================================================
# http://autoconf-archive.cryp.to/ac_cxx_have_numeric_limits.html
# ===========================================================================
#
# SYNOPSIS
#
# AC_CXX_HAVE_NUMERIC_LIMITS
#
# DESCRIPTION
#
# If the compiler has numeric_limits<T>, define HAVE_NUMERIC_LIMITS.
#
# LICENSE
#
# 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_HAVE_NUMERIC_LIMITS],
[AC_CACHE_CHECK(whether the compiler has numeric_limits<T>,
ac_cv_cxx_have_numeric_limits,
[AC_REQUIRE([AC_CXX_NAMESPACES])
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([#include <limits>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif],[double e = numeric_limits<double>::epsilon(); return 0;],
ac_cv_cxx_have_numeric_limits=yes, ac_cv_cxx_have_numeric_limits=no)
AC_LANG_RESTORE
])
if test "$ac_cv_cxx_have_numeric_limits" = yes; then
AC_DEFINE(HAVE_NUMERIC_LIMITS,,[define if the compiler has numeric_limits<T>])
fi
])
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