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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/config.hpp> | |
14 | #include <boost/utility/enable_if.hpp> | |
15 | #include <boost/type_traits/is_arithmetic.hpp> | |
f67539c2 | 16 | #include <boost/core/lightweight_test.hpp> |
7c673cae FG |
17 | |
18 | using boost::enable_if; | |
19 | using boost::is_arithmetic; | |
20 | ||
21 | template<class T> struct not_ | |
22 | { | |
23 | BOOST_STATIC_CONSTANT( bool, value = !T::value ); | |
24 | }; | |
25 | ||
26 | template<class T> | |
27 | typename enable_if<is_arithmetic<T>, bool>::type | |
1e59de90 | 28 | arithmetic_object(T /*t*/) { return true; } |
7c673cae FG |
29 | |
30 | template<class T> | |
31 | typename enable_if<not_<is_arithmetic<T> >, bool>::type | |
1e59de90 | 32 | arithmetic_object(T /*t*/) { return false; } |
7c673cae FG |
33 | |
34 | ||
35 | int main() | |
36 | { | |
37 | ||
38 | BOOST_TEST(arithmetic_object(1)); | |
39 | BOOST_TEST(arithmetic_object(1.0)); | |
40 | ||
41 | BOOST_TEST(!arithmetic_object("1")); | |
42 | BOOST_TEST(!arithmetic_object(static_cast<void*>(0))); | |
43 | ||
44 | return boost::report_errors(); | |
45 | } |