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 template <int N> struct dummy {
dummydummy22   dummy(int) {};
23 };
24 
25 template<class T>
26 typename enable_if<is_arithmetic<T>, bool>::type
arithmetic_object(T t,dummy<0>=0)27 arithmetic_object(T t, dummy<0> = 0) { return true; }
28 
29 template<class T>
30 typename disable_if<is_arithmetic<T>, bool>::type
arithmetic_object(T t,dummy<1>=0)31 arithmetic_object(T t, dummy<1> = 0) { return false; }
32 
33 
main()34 int main()
35 {
36 
37   BOOST_TEST(arithmetic_object(1));
38   BOOST_TEST(arithmetic_object(1.0));
39 
40   BOOST_TEST(!arithmetic_object("1"));
41   BOOST_TEST(!arithmetic_object(static_cast<void*>(0)));
42 
43   return boost::report_errors();
44 }
45 
46