FM / std

/usr/include/boost/hana/ext/std

Name	Size	Mode	Actions
array.hpp	6306	0644	edit dl rm
integer_sequence.hpp	5292	0644	edit dl rm
integral_constant.hpp	2975	0644	edit dl rm
pair.hpp	2687	0644	edit dl rm
ratio.hpp	5736	0644	edit dl rm
tuple.hpp	6118	0644	edit dl rm
vector.hpp	3907	0644	edit dl rm

Edit: /usr/include/boost/hana/ext/std/pair.hpp (2687B)

/*!
@file
Adapts `std::pair` for use with Hana.

@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_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

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