Boost provides free peer-reviewed portable C++ source libraries. We emphasize libraries that work

				// Boost enable_if library								// Copyright 2003 (c) The Trustees of Indiana University.								// Use, modification, and distribution is subject to the Boost Software				// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at				// http://www.boost.org/LICENSE_1_0.txt)								//    Authors: Jaakko Jarvi (jajarvi at osl.iu.edu)				//             Jeremiah Willcock (jewillco at osl.iu.edu)				//             Andrew Lumsdaine (lums at osl.iu.edu)								#include 				#include 								#include 				#include 								using boost::mpl::not_;				using boost::enable_if;				using boost::is_arithmetic;								template				typename enable_if::type				arithmetic_object(T t) { return true; }								template				typename enable_if::type				arithmetic_object(T t) { return false; }												int test_main(int, char*[])				{				 				  BOOST_CHECK(arithmetic_object(1));				  BOOST_CHECK(arithmetic_object(1.0));								  BOOST_CHECK(!arithmetic_object("1"));  				  BOOST_CHECK(!arithmetic_object(static_cast(0)));  								  return 0;				}