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- // Copyright (c) 2009-2016 Vladimir Batov.
- // Use, modification and distribution are subject to the Boost Software License,
- // Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
- #ifndef BOOST_CONVERT_IS_CONVERTER_HPP
- #define BOOST_CONVERT_IS_CONVERTER_HPP
- #include <boost/convert/detail/config.hpp>
- #include <boost/convert/detail/is_callable.hpp>
- #include <boost/utility/enable_if.hpp>
- #include <boost/type_traits.hpp>
- #include <boost/ref.hpp>
- namespace boost { namespace cnv
- {
- template<typename, typename, typename, typename =void>
- struct is_cnv { BOOST_STATIC_CONSTANT(bool, value = false); };
- template<typename Class, typename TypeIn, typename TypeOut>
- struct is_cnv<Class, TypeIn, TypeOut, typename enable_if<is_class<Class>, void>::type>
- {
- typedef typename ::boost::unwrap_reference<Class>::type class_type;
- typedef void signature_type(TypeIn const&, optional<TypeOut>&);
- BOOST_DECLARE_IS_CALLABLE(is_callable, operator());
- BOOST_STATIC_CONSTANT(bool, value = (is_callable<class_type, signature_type>::value));
- };
- template<typename Function, typename TypeIn, typename TypeOut>
- struct is_cnv<Function, TypeIn, TypeOut,
- typename enable_if_c<is_function<Function>::value && function_types::function_arity<Function>::value == 2,
- void>::type>
- {
- typedef TypeIn in_type;
- typedef optional<TypeOut>& out_type;
- typedef typename function_traits<Function>::arg1_type func_in_type;
- typedef typename function_traits<Function>::arg2_type func_out_type;
- BOOST_STATIC_CONSTANT(bool, in_good = (is_convertible<in_type, func_in_type>::value));
- BOOST_STATIC_CONSTANT(bool, out_good = (is_same<out_type, func_out_type>::value));
- BOOST_STATIC_CONSTANT(bool, value = (in_good && out_good));
- };
- }}
- #endif // BOOST_CONVERT_IS_CONVERTER_HPP
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