mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-23 13:22:02 +03:00
76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
/*!
|
|
@file
|
|
Defines `boost::hana::not_`.
|
|
|
|
@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_NOT_HPP
|
|
#define BOOST_HANA_NOT_HPP
|
|
|
|
#include <boost/hana/fwd/not.hpp>
|
|
|
|
#include <boost/hana/concept/constant.hpp>
|
|
#include <boost/hana/concept/logical.hpp>
|
|
#include <boost/hana/config.hpp>
|
|
#include <boost/hana/core/to.hpp>
|
|
#include <boost/hana/core/dispatch.hpp>
|
|
#include <boost/hana/detail/canonical_constant.hpp>
|
|
|
|
#include <type_traits>
|
|
|
|
|
|
BOOST_HANA_NAMESPACE_BEGIN
|
|
//! @cond
|
|
template <typename X>
|
|
constexpr decltype(auto) not_t::operator()(X&& x) const {
|
|
using Bool = typename hana::tag_of<X>::type;
|
|
using Not = BOOST_HANA_DISPATCH_IF(hana::not_impl<Bool>,
|
|
hana::Logical<Bool>::value
|
|
);
|
|
|
|
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
|
|
static_assert(hana::Logical<Bool>::value,
|
|
"hana::not_(cond) requires 'cond' to be a Logical");
|
|
#endif
|
|
|
|
return Not::apply(static_cast<X&&>(x));
|
|
}
|
|
//! @endcond
|
|
|
|
template <typename L, bool condition>
|
|
struct not_impl<L, when<condition>> : hana::default_ {
|
|
template <typename ...Args>
|
|
static constexpr auto apply(Args&& ...) = delete;
|
|
};
|
|
|
|
template <typename L>
|
|
struct not_impl<L, hana::when<std::is_arithmetic<L>::value>> {
|
|
template <typename Cond>
|
|
static constexpr Cond apply(Cond const& cond)
|
|
{ return static_cast<Cond>(cond ? false : true); }
|
|
};
|
|
|
|
namespace detail {
|
|
template <typename C, typename X>
|
|
struct constant_from_not {
|
|
static constexpr auto value = hana::not_(hana::value<X>());
|
|
using hana_tag = detail::CanonicalConstant<typename C::value_type>;
|
|
};
|
|
}
|
|
|
|
template <typename C>
|
|
struct not_impl<C, hana::when<
|
|
hana::Constant<C>::value &&
|
|
hana::Logical<typename C::value_type>::value
|
|
>> {
|
|
template <typename Cond>
|
|
static constexpr auto apply(Cond const&)
|
|
{ return hana::to<C>(detail::constant_from_not<C, Cond>{}); }
|
|
};
|
|
BOOST_HANA_NAMESPACE_END
|
|
|
|
#endif // !BOOST_HANA_NOT_HPP
|