Edit: /usr/include/boost/hana/not.hpp (2217B)
/*!
@file
Defines `boost::hana::not_`.
@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_NOT_HPP
#define BOOST_HANA_NOT_HPP
#include
#include
#include
#include
#include
#include
#include
#include
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template
constexpr decltype(auto) not_t::operator()(X&& x) const {
using Bool = typename hana::tag_of::type;
using Not = BOOST_HANA_DISPATCH_IF(hana::not_impl,
hana::Logical::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::Logical::value,
"hana::not_(cond) requires 'cond' to be a Logical");
#endif
return Not::apply(static_cast(x));
}
//! @endcond
template
struct not_impl> : hana::default_ {
template
static constexpr auto apply(Args&& ...) = delete;
};
template
struct not_impl::value>> {
template
static constexpr Cond apply(Cond const& cond)
{ return static_cast(cond ? false : true); }
};
namespace detail {
template
struct constant_from_not {
static constexpr auto value = hana::not_(hana::value());
using hana_tag = detail::CanonicalConstant;
};
}
template
struct not_impl::value &&
hana::Logical::value
>> {
template
static constexpr auto apply(Cond const&)
{ return hana::to(detail::constant_from_not{}); }
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_NOT_HPP