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- /*!
- @file
- Defines `boost::hana::is_a` and `boost::hana::is_an`.
- @copyright Louis Dionne 2013-2017
- Distributed under the Boost Software License, Version 1.0.
- (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- */
- #ifndef BOOST_HANA_CORE_IS_A_HPP
- #define BOOST_HANA_CORE_IS_A_HPP
- #include <boost/hana/fwd/core/is_a.hpp>
- #include <boost/hana/bool.hpp>
- #include <boost/hana/config.hpp>
- #include <boost/hana/core/tag_of.hpp>
- #include <type_traits>
- BOOST_HANA_NAMESPACE_BEGIN
- //////////////////////////////////////////////////////////////////////////
- // is_a
- //////////////////////////////////////////////////////////////////////////
- template <typename DataType, typename T>
- struct is_a_t<DataType, T>
- : integral_constant<bool,
- std::is_same<DataType, typename hana::tag_of<T>::type>::value
- >
- { };
- template <typename DataType>
- struct is_a_t<DataType> {
- template <typename T>
- constexpr auto operator()(T const&) const
- { return hana::is_a<DataType, T>; }
- };
- BOOST_HANA_NAMESPACE_END
- #endif // !BOOST_HANA_CORE_IS_A_HPP
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