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Diffstat (limited to 'boost/hana/core/is_a.hpp')
| -rw-r--r-- | boost/hana/core/is_a.hpp | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/boost/hana/core/is_a.hpp b/boost/hana/core/is_a.hpp new file mode 100644 index 0000000000..91cf45121a --- /dev/null +++ b/boost/hana/core/is_a.hpp @@ -0,0 +1,41 @@ +/*! +@file +Defines `boost::hana::is_a` and `boost::hana::is_an`. + +@copyright Louis Dionne 2013-2016 +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 |