mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-26 06:42:15 +03:00
52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
/*!
|
|
@file
|
|
Defines `boost::hana::monadic_compose`.
|
|
|
|
@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_MONADIC_COMPOSE_HPP
|
|
#define BOOST_HANA_MONADIC_COMPOSE_HPP
|
|
|
|
#include <boost/hana/fwd/monadic_compose.hpp>
|
|
|
|
#include <boost/hana/chain.hpp>
|
|
#include <boost/hana/concept/monad.hpp>
|
|
#include <boost/hana/config.hpp>
|
|
#include <boost/hana/core/dispatch.hpp>
|
|
#include <boost/hana/functional/partial.hpp>
|
|
|
|
|
|
BOOST_HANA_NAMESPACE_BEGIN
|
|
namespace detail {
|
|
struct monadic_compose_helper {
|
|
template <typename F, typename G, typename X>
|
|
constexpr decltype(auto) operator()(F&& f, G&& g, X&& x) const {
|
|
using M = typename hana::tag_of<decltype(g(x))>::type;
|
|
|
|
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
|
|
static_assert(hana::Monad<M>::value,
|
|
"hana::monadic_compose(f, g) requires 'g' to return a monadic value");
|
|
#endif
|
|
|
|
return hana::chain(static_cast<G&&>(g)(static_cast<X&&>(x)),
|
|
static_cast<F&&>(f));
|
|
}
|
|
};
|
|
}
|
|
|
|
//! @cond
|
|
template <typename F, typename G>
|
|
constexpr auto monadic_compose_t::operator()(F&& f, G&& g) const {
|
|
return hana::partial(detail::monadic_compose_helper{},
|
|
static_cast<F&&>(f),
|
|
static_cast<G&&>(g)
|
|
);
|
|
}
|
|
//! @endcond
|
|
BOOST_HANA_NAMESPACE_END
|
|
|
|
#endif // !BOOST_HANA_MONADIC_COMPOSE_HPP
|