stabilize build system: depends, installer, boost/bdb fixes, cross targets groundwork
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/*!
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@file
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Defines `boost::hana::pair`.
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@copyright Louis Dionne 2013-2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_PAIR_HPP
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#define BOOST_HANA_PAIR_HPP
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#include <boost/hana/fwd/pair.hpp>
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#include <boost/hana/config.hpp>
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#include <boost/hana/detail/decay.hpp>
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#include <boost/hana/detail/ebo.hpp>
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#include <boost/hana/detail/intrinsics.hpp>
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#include <boost/hana/detail/operators/adl.hpp>
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#include <boost/hana/detail/operators/comparable.hpp>
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#include <boost/hana/detail/operators/orderable.hpp>
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#include <boost/hana/fwd/core/make.hpp>
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#include <boost/hana/fwd/first.hpp>
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#include <boost/hana/fwd/second.hpp>
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#include <type_traits>
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#include <utility>
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BOOST_HANA_NAMESPACE_BEGIN
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namespace detail {
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template <int> struct pix; // pair index
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}
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//////////////////////////////////////////////////////////////////////////
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// pair
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//////////////////////////////////////////////////////////////////////////
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//! @cond
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template <typename First, typename Second>
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struct pair : detail::operators::adl<pair<First, Second>>
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, private detail::ebo<detail::pix<0>, First>
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, private detail::ebo<detail::pix<1>, Second>
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{
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// Default constructor
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template <typename ...dummy, typename = typename std::enable_if<
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BOOST_HANA_TT_IS_CONSTRUCTIBLE(First, dummy...) &&
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BOOST_HANA_TT_IS_CONSTRUCTIBLE(Second, dummy...)
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>::type>
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constexpr pair()
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: detail::ebo<detail::pix<0>, First>()
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, detail::ebo<detail::pix<1>, Second>()
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{ }
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// Variadic constructors
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template <typename ...dummy, typename = typename std::enable_if<
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BOOST_HANA_TT_IS_CONSTRUCTIBLE(First, First const&, dummy...) &&
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BOOST_HANA_TT_IS_CONSTRUCTIBLE(Second, Second const&, dummy...)
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>::type>
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constexpr pair(First const& fst, Second const& snd)
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: detail::ebo<detail::pix<0>, First>(fst)
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, detail::ebo<detail::pix<1>, Second>(snd)
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{ }
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template <typename T, typename U, typename = typename std::enable_if<
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BOOST_HANA_TT_IS_CONVERTIBLE(T&&, First) &&
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BOOST_HANA_TT_IS_CONVERTIBLE(U&&, Second)
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>::type>
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constexpr pair(T&& t, U&& u)
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: detail::ebo<detail::pix<0>, First>(static_cast<T&&>(t))
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, detail::ebo<detail::pix<1>, Second>(static_cast<U&&>(u))
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{ }
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// Possibly converting copy and move constructors
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template <typename T, typename U, typename = typename std::enable_if<
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BOOST_HANA_TT_IS_CONSTRUCTIBLE(First, T const&) &&
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BOOST_HANA_TT_IS_CONSTRUCTIBLE(Second, U const&) &&
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BOOST_HANA_TT_IS_CONVERTIBLE(T const&, First) &&
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BOOST_HANA_TT_IS_CONVERTIBLE(U const&, Second)
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>::type>
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constexpr pair(pair<T, U> const& other)
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: detail::ebo<detail::pix<0>, First>(detail::ebo_get<detail::pix<0>>(other))
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, detail::ebo<detail::pix<1>, Second>(detail::ebo_get<detail::pix<1>>(other))
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{ }
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template <typename T, typename U, typename = typename std::enable_if<
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BOOST_HANA_TT_IS_CONSTRUCTIBLE(First, T&&) &&
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BOOST_HANA_TT_IS_CONSTRUCTIBLE(Second, U&&) &&
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BOOST_HANA_TT_IS_CONVERTIBLE(T&&, First) &&
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BOOST_HANA_TT_IS_CONVERTIBLE(U&&, Second)
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>::type>
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constexpr pair(pair<T, U>&& other)
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: detail::ebo<detail::pix<0>, First>(static_cast<T&&>(detail::ebo_get<detail::pix<0>>(other)))
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, detail::ebo<detail::pix<1>, Second>(static_cast<U&&>(detail::ebo_get<detail::pix<1>>(other)))
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{ }
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// Copy and move assignment
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template <typename T, typename U, typename = typename std::enable_if<
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BOOST_HANA_TT_IS_ASSIGNABLE(First&, T const&) &&
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BOOST_HANA_TT_IS_ASSIGNABLE(Second&, U const&)
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>::type>
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constexpr pair& operator=(pair<T, U> const& other) {
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detail::ebo_get<detail::pix<0>>(*this) = detail::ebo_get<detail::pix<0>>(other);
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detail::ebo_get<detail::pix<1>>(*this) = detail::ebo_get<detail::pix<1>>(other);
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return *this;
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}
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template <typename T, typename U, typename = typename std::enable_if<
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BOOST_HANA_TT_IS_ASSIGNABLE(First&, T&&) &&
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BOOST_HANA_TT_IS_ASSIGNABLE(Second&, U&&)
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>::type>
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constexpr pair& operator=(pair<T, U>&& other) {
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detail::ebo_get<detail::pix<0>>(*this) = static_cast<T&&>(detail::ebo_get<detail::pix<0>>(other));
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detail::ebo_get<detail::pix<1>>(*this) = static_cast<U&&>(detail::ebo_get<detail::pix<1>>(other));
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return *this;
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}
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// Prevent the compiler from defining the default copy and move
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// constructors, which interfere with the SFINAE above.
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~pair() = default;
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friend struct first_impl<pair_tag>;
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friend struct second_impl<pair_tag>;
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template <typename F, typename S> friend struct pair;
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};
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//! @endcond
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template <typename First, typename Second>
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struct tag_of<pair<First, Second>> {
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using type = pair_tag;
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};
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//////////////////////////////////////////////////////////////////////////
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// Operators
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//////////////////////////////////////////////////////////////////////////
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namespace detail {
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template <>
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struct comparable_operators<pair_tag> {
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static constexpr bool value = true;
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};
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template <>
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struct orderable_operators<pair_tag> {
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static constexpr bool value = true;
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};
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}
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//////////////////////////////////////////////////////////////////////////
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// Product
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//////////////////////////////////////////////////////////////////////////
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template <>
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struct make_impl<pair_tag> {
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template <typename F, typename S>
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static constexpr pair<
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typename detail::decay<F>::type,
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typename detail::decay<S>::type
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> apply(F&& f, S&& s) {
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return {static_cast<F&&>(f), static_cast<S&&>(s)};
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}
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};
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template <>
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struct first_impl<pair_tag> {
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template <typename First, typename Second>
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static constexpr decltype(auto) apply(hana::pair<First, Second>& p) {
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return detail::ebo_get<detail::pix<0>>(
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static_cast<detail::ebo<detail::pix<0>, First>&>(p)
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);
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}
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template <typename First, typename Second>
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static constexpr decltype(auto) apply(hana::pair<First, Second> const& p) {
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return detail::ebo_get<detail::pix<0>>(
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static_cast<detail::ebo<detail::pix<0>, First> const&>(p)
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);
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}
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template <typename First, typename Second>
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static constexpr decltype(auto) apply(hana::pair<First, Second>&& p) {
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return detail::ebo_get<detail::pix<0>>(
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static_cast<detail::ebo<detail::pix<0>, First>&&>(p)
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);
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}
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};
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template <>
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struct second_impl<pair_tag> {
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template <typename First, typename Second>
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static constexpr decltype(auto) apply(hana::pair<First, Second>& p) {
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return detail::ebo_get<detail::pix<1>>(
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static_cast<detail::ebo<detail::pix<1>, Second>&>(p)
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);
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}
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template <typename First, typename Second>
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static constexpr decltype(auto) apply(hana::pair<First, Second> const& p) {
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return detail::ebo_get<detail::pix<1>>(
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static_cast<detail::ebo<detail::pix<1>, Second> const&>(p)
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);
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}
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template <typename First, typename Second>
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static constexpr decltype(auto) apply(hana::pair<First, Second>&& p) {
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return detail::ebo_get<detail::pix<1>>(
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static_cast<detail::ebo<detail::pix<1>, Second>&&>(p)
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);
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}
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};
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BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_PAIR_HPP
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