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fix type_traits implementation

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bolero-MURAKAMI 2016-04-19 15:14:40 +09:00
parent bd2194e331
commit ef073dbdbb
7 changed files with 111 additions and 6 deletions
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50
sprout/iterator/const_reference_cast.hpp
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@ -189,4 +189,54 @@ namespace sprout {
}
} // namespace sprout
//
// note:
// const_reference_cast is an adaptable function for interconversion
// with reference and const_reference.
// If you want to adapt a user-defined reference proxy class to const_reference_cast:
// - Specialize sprout::is_const_reference_cast_convertible.
// - Overload const_reference_conversion as to be lookup in the ADL.
//
// example:
// #include <type_traits>
// #include <sprout/config.hpp>
// #include <sprout/type_traits.hpp>
// #include <sprout/iterator/const_reference_cast.hpp>
// /* Mylib::Reference is an user-defined reference proxy class*/
// namespace Mylib {
// template<typename T>
// struct Reference {
// T* p;
// typedef T* pointer;
// /* definition reference proxy interface... */
// };
// }
// /* const_reference_cast adapt for Mylib::Reference */
// namespace sprout {
// template<typename From, typename To>
// struct is_const_reference_cast_convertible<
// Mylib::Reference<From>,
// Mylib::Reference<To>
// >
// : public sprout::is_same<
// typename std::remove_cv<From>::type,
// typename std::remove_cv<To>::type
// >
// {};
// }
// namespace Mylib {
// template<typename To, typename From>
// inline SPROUT_CONSTEXPR typename std::enable_if<
// sprout::is_const_reference_cast_convertible<Reference<From>, To>::value,
// To
// >::type
// const_reference_conversion(Reference<From> const& it) {
// return To{const_cast<typename To::pointer>(it.p)};
// }
// }
// /* test const_reference_cast with Mylib::Reference */
// constexpr Mylib::Reference<int const> it{0};
// static_assert(sprout::const_reference_cast<Mylib::Reference<int> >(it).p == 0, "");
//
#endif // #ifndef SPROUT_ITERATOR_CONST_REFERENCE_CAST_HPP