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1 | /*! |
2 | @file | |
3 | Defines `boost::hana::default_` and `boost::hana::is_default`. | |
4 | ||
5 | @copyright Louis Dionne 2013-2016 | |
6 | Distributed under the Boost Software License, Version 1.0. | |
7 | (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) | |
8 | */ | |
9 | ||
10 | #ifndef BOOST_HANA_CORE_DEFAULT_HPP | |
11 | #define BOOST_HANA_CORE_DEFAULT_HPP | |
12 | ||
13 | #include <boost/hana/fwd/core/default.hpp> | |
14 | ||
15 | #include <boost/hana/config.hpp> | |
16 | ||
17 | #include <type_traits> | |
18 | ||
19 | ||
20 | BOOST_HANA_NAMESPACE_BEGIN | |
21 | template <typename Method, typename> | |
22 | struct is_default : std::false_type { }; | |
23 | ||
24 | template <typename Method> | |
25 | struct is_default<Method, decltype((void) | |
26 | static_cast<default_>(*(Method*)0) | |
27 | )> | |
28 | : std::true_type | |
29 | { }; | |
30 | BOOST_HANA_NAMESPACE_END | |
31 | ||
32 | #endif // !BOOST_HANA_CORE_DEFAULT_HPP |