1 // Boost enable_if library 2 3 // Copyright 2003 (c) The Trustees of Indiana University. 4 5 // Use, modification, and distribution is subject to the Boost Software 6 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 7 // http://www.boost.org/LICENSE_1_0.txt) 8 9 // Authors: Jaakko Jarvi (jajarvi at osl.iu.edu) 10 // Jeremiah Willcock (jewillco at osl.iu.edu) 11 // Andrew Lumsdaine (lums at osl.iu.edu) 12 13 #include <boost/utility/enable_if.hpp> 14 #include <boost/type_traits/is_arithmetic.hpp> 15 #include <boost/core/lightweight_test.hpp> 16 17 using boost::enable_if; 18 using boost::disable_if; 19 using boost::is_arithmetic; 20 21 struct container { 22 template <class T> 23 typename enable_if<is_arithmetic<T>, bool>::type arithmetic_objectcontainer24 arithmetic_object(const T&, const int* /* disambiguate */ = 0) {return true;} 25 26 template <class T> 27 typename disable_if<is_arithmetic<T>, bool>::type arithmetic_objectcontainer28 arithmetic_object(const T&) {return false;} 29 }; 30 main()31int main() 32 { 33 34 BOOST_TEST(container().arithmetic_object(1)); 35 BOOST_TEST(container().arithmetic_object(1.0)); 36 37 BOOST_TEST(!container().arithmetic_object("1")); 38 BOOST_TEST(!container().arithmetic_object(static_cast<void*>(0))); 39 40 return boost::report_errors(); 41 } 42 43