mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-29 16:44:27 +03:00
92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
|
/*!
|
||
|
|
@file
|
||
|
|
Adapts `std::pair` for use with Hana.
|
||
|
|
|
||
|
|
@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_EXT_STD_PAIR_HPP
|
||
|
|
#define BOOST_HANA_EXT_STD_PAIR_HPP
|
||
|
|
|
||
|
|
#include <boost/hana/config.hpp>
|
||
|
|
#include <boost/hana/fwd/core/make.hpp>
|
||
|
|
#include <boost/hana/fwd/core/tag_of.hpp>
|
||
|
|
#include <boost/hana/fwd/first.hpp>
|
||
|
|
#include <boost/hana/fwd/second.hpp>
|
||
|
|
|
||
|
|
#include <utility>
|
||
|
|
|
||
|
|
|
||
|
|
#ifdef BOOST_HANA_DOXYGEN_INVOKED
|
||
|
|
namespace std {
|
||
|
|
//! @ingroup group-ext-std
|
||
|
|
//! Adaptation of `std::pair` for Hana.
|
||
|
|
//!
|
||
|
|
//!
|
||
|
|
//! Modeled concepts
|
||
|
|
//! ----------------
|
||
|
|
//! A `std::pair` models exactly the same concepts as a `hana::pair`.
|
||
|
|
//! Please refer to the documentation of `hana::pair` for details.
|
||
|
|
//!
|
||
|
|
//! @include example/ext/std/pair.cpp
|
||
|
|
template <typename First, typename Second>
|
||
|
|
struct pair { };
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
BOOST_HANA_NAMESPACE_BEGIN
|
||
|
|
namespace ext { namespace std { struct pair_tag; }}
|
||
|
|
|
||
|
|
template <typename First, typename Second>
|
||
|
|
struct tag_of<std::pair<First, Second>> {
|
||
|
|
using type = ext::std::pair_tag;
|
||
|
|
};
|
||
|
|
|
||
|
|
//////////////////////////////////////////////////////////////////////////
|
||
|
|
// Product
|
||
|
|
//////////////////////////////////////////////////////////////////////////
|
||
|
|
template <>
|
||
|
|
struct make_impl<ext::std::pair_tag> {
|
||
|
|
template <typename X, typename Y>
|
||
|
|
static constexpr decltype(auto) apply(X&& x, Y&& y) {
|
||
|
|
return std::make_pair(static_cast<X&&>(x),
|
||
|
|
static_cast<Y&&>(y));
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
template <>
|
||
|
|
struct first_impl<ext::std::pair_tag> {
|
||
|
|
template <typename T, typename U>
|
||
|
|
static constexpr T const& apply(std::pair<T, U> const& p)
|
||
|
|
{ return p.first; }
|
||
|
|
|
||
|
|
template <typename T, typename U>
|
||
|
|
static constexpr T& apply(std::pair<T, U>& p)
|
||
|
|
{ return p.first; }
|
||
|
|
|
||
|
|
template <typename T, typename U>
|
||
|
|
static constexpr T&& apply(std::pair<T, U>&& p)
|
||
|
|
{ return static_cast<T&&>(p.first); }
|
||
|
|
};
|
||
|
|
|
||
|
|
template <>
|
||
|
|
struct second_impl<ext::std::pair_tag> {
|
||
|
|
template <typename T, typename U>
|
||
|
|
static constexpr U const& apply(std::pair<T, U> const& p)
|
||
|
|
{ return p.second; }
|
||
|
|
|
||
|
|
template <typename T, typename U>
|
||
|
|
static constexpr U& apply(std::pair<T, U>& p)
|
||
|
|
{ return p.second; }
|
||
|
|
|
||
|
|
template <typename T, typename U>
|
||
|
|
static constexpr U&& apply(std::pair<T, U>&& p)
|
||
|
|
{ return static_cast<U&&>(p.second); }
|
||
|
|
};
|
||
|
|
BOOST_HANA_NAMESPACE_END
|
||
|
|
|
||
|
|
#endif // !BOOST_HANA_EXT_STD_PAIR_HPP
|