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- // Copyright (C) 2009-2012 Lorenzo Caminiti
- // Distributed under the Boost Software License, Version 1.0
- // (see accompanying file LICENSE_1_0.txt or a copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- // Home at http://www.boost.org/libs/local_function
- #ifndef ADDABLE_HPP_
- #define ADDABLE_HPP_
- #include <boost/concept_check.hpp>
- template<typename T>
- struct Addable { // User-defined concept.
- BOOST_CONCEPT_USAGE(Addable) {
- return_type(x + y); // Check addition `T operator+(T x, T y)`.
- }
- private:
- void return_type(T) {} // Implementation (required for some linkers).
- static T const& x;
- static T const& y;
- };
- #endif // #include guard
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