1 dnl @synopsis AC_CXX_HAVE_NUMERIC_LIMITS
3 dnl If the compiler has numeric_limits<T>, define HAVE_NUMERIC_LIMITS.
5 dnl @version $Id: ac_cxx_have_numeric_limits.m4,v 1.1 2005/01/07 02:52:49 norwin Exp $
6 dnl @author Todd Veldhuizen and Luc Maisonobe <luc@spaceroots.org>
8 AC_DEFUN([AC_CXX_HAVE_NUMERIC_LIMITS],
9 [AC_CACHE_CHECK(whether the compiler has numeric_limits<T>,
10 ac_cv_cxx_have_numeric_limits,
11 [AC_REQUIRE([AC_CXX_NAMESPACES])
14 AC_TRY_COMPILE([#include <limits>
15 #ifdef HAVE_NAMESPACES
17 #endif],[double e = numeric_limits<double>::epsilon(); return 0;],
18 ac_cv_cxx_have_numeric_limits=yes, ac_cv_cxx_have_numeric_limits=no)
21 if test "$ac_cv_cxx_have_numeric_limits" = yes; then
22 AC_DEFINE(HAVE_NUMERIC_LIMITS,,[define if the compiler has numeric_limits<T>])