projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /*! |
| 2 | @file | |
| 3 | Defines `boost::hana::and_`. | |
| 4 | ||
| 5 | @copyright Louis Dionne 2013-2016 | |
| 6 | Distributed under the Boost Software License, Version 1.0. | |
| 7 | (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) | |
| 8 | */ | |
| 9 | ||
| 10 | #ifndef BOOST_HANA_AND_HPP | |
| 11 | #define BOOST_HANA_AND_HPP | |
| 12 | ||
| 13 | #include <boost/hana/fwd/and.hpp> | |
| 14 | ||
| 15 | #include <boost/hana/concept/logical.hpp> | |
| 16 | #include <boost/hana/config.hpp> | |
| 17 | #include <boost/hana/core/dispatch.hpp> | |
| 18 | #include <boost/hana/detail/variadic/foldl1.hpp> | |
| 19 | #include <boost/hana/if.hpp> | |
| 20 | ||
| 21 | ||
| 22 | BOOST_HANA_NAMESPACE_BEGIN | |
| 23 | //! @cond | |
| 24 | template <typename X, typename Y> | |
| 25 | constexpr decltype(auto) and_t::operator()(X&& x, Y&& y) const { | |
| 26 | using Bool = typename hana::tag_of<X>::type; | |
| 27 | using And = BOOST_HANA_DISPATCH_IF(and_impl<Bool>, | |
| 28 | hana::Logical<Bool>::value | |
| 29 | ); | |
| 30 | ||
| 31 | #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS | |
| 32 | static_assert(hana::Logical<Bool>::value, | |
| 33 | "hana::and_(x, y) requires 'x' to be a Logical"); | |
| 34 | #endif | |
| 35 | ||
| 36 | return And::apply(static_cast<X&&>(x), static_cast<Y&&>(y)); | |
| 37 | } | |
| 38 | ||
| 39 | template <typename X, typename ...Y> | |
| 40 | constexpr decltype(auto) and_t::operator()(X&& x, Y&& ...y) const { | |
| 41 | return detail::variadic::foldl1( | |
| 42 | *this, | |
| 43 | static_cast<X&&>(x), | |
| 44 | static_cast<Y&&>(y)... | |
| 45 | ); | |
| 46 | } | |
| 47 | //! @endcond | |
| 48 | ||
| 49 | template <typename L, bool condition> | |
| 50 | struct and_impl<L, when<condition>> : default_ { | |
| 51 | template <typename X, typename Y> | |
| 52 | static constexpr decltype(auto) apply(X&& x, Y&& y) { | |
| 53 | return hana::if_(x, static_cast<Y&&>(y), x); | |
| 54 | } | |
| 55 | }; | |
| 56 | BOOST_HANA_NAMESPACE_END | |
| 57 | ||
| 58 | #endif // !BOOST_HANA_AND_HPP |