213 lines
4.1 KiB
C++
213 lines
4.1 KiB
C++
//
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// Copyright (c) 2016-2019 Damian Jarek (damian dot jarek93 at gmail dot com)
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// Copyright (c) 2022 Vinnie Falco (vinnie dot falco at gmail dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// Official repository: https://github.com/boostorg/beast
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//
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#ifndef BOOST_URL_GRAMMAR_DETAIL_TUPLE_HPP
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#define BOOST_URL_GRAMMAR_DETAIL_TUPLE_HPP
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#include <boost/url/detail/config.hpp>
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#include <boost/url/error_types.hpp>
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#include <boost/core/empty_value.hpp>
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#include <boost/mp11/algorithm.hpp>
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#include <boost/mp11/function.hpp>
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#include <boost/mp11/integer_sequence.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/type_traits/copy_cv.hpp>
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#include <cstdlib>
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#include <utility>
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#ifndef BOOST_URL_TUPLE_EBO
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// VFALCO No idea what causes it or how to fix it
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// https://devblogs.microsoft.com/cppblog/optimizing-the-layout-of-empty-base-classes-in-vs2015-update-2-3/
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#ifdef BOOST_MSVC
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#define BOOST_URL_TUPLE_EBO 0
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#else
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#define BOOST_URL_TUPLE_EBO 1
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#endif
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#endif
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namespace boost {
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namespace urls {
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namespace grammar {
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namespace detail {
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#if BOOST_URL_TUPLE_EBO
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template<std::size_t I, class T>
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struct tuple_element_impl
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: empty_value<T>
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{
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constexpr
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tuple_element_impl(T const& t)
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: empty_value<T>(
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empty_init, t)
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{
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}
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constexpr
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tuple_element_impl(T&& t)
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: empty_value<T>(
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empty_init,
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std::move(t))
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{
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}
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};
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#else
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template<std::size_t I, class T>
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struct tuple_element_impl
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{
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T t_;
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constexpr
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tuple_element_impl(T const& t)
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: t_(t)
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{
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}
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constexpr
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tuple_element_impl(T&& t)
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: t_(std::move(t))
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{
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}
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constexpr
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T&
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get() noexcept
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{
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return t_;
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}
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constexpr
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T const&
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get() const noexcept
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{
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return t_;
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}
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};
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#endif
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template<std::size_t I, class T>
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struct tuple_element_impl<I, T&>
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{
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T& t;
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constexpr
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tuple_element_impl(T& t_)
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: t(t_)
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{
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}
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T&
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get() const noexcept
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{
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return t;
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}
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};
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template<class... Ts>
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struct tuple_impl;
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template<class... Ts, std::size_t... Is>
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struct tuple_impl<
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mp11::index_sequence<Is...>, Ts...>
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: tuple_element_impl<Is, Ts>...
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{
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template<class... Us>
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constexpr
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explicit
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tuple_impl(Us&&... us)
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: tuple_element_impl<Is, Ts>(
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std::forward<Us>(us))...
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{
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}
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};
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template<class... Ts>
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struct tuple
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: tuple_impl<
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mp11::index_sequence_for<Ts...>, Ts...>
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{
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template<class... Us,
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typename std::enable_if<
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mp11::mp_bool<
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mp11::mp_all<std::is_constructible<
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Ts, Us>...>::value &&
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! mp11::mp_all<std::is_convertible<
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Us, Ts>...>::value>::value,
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int>::type = 0
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>
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constexpr
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explicit
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tuple(Us&&... us) noexcept
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: tuple_impl<mp11::index_sequence_for<
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Ts...>, Ts...>{std::forward<Us>(us)...}
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{
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}
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template<class... Us,
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typename std::enable_if<
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mp11::mp_all<std::is_convertible<
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Us, Ts>...>::value,
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int>::type = 0
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>
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constexpr
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tuple(Us&&... us) noexcept
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: tuple_impl<mp11::index_sequence_for<
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Ts...>, Ts...>{std::forward<Us>(us)...}
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{
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}
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};
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//------------------------------------------------
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template<std::size_t I, class T>
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constexpr
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T&
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get(tuple_element_impl<I, T>& te)
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{
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return te.get();
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}
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template<std::size_t I, class T>
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constexpr
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T const&
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get(tuple_element_impl<I, T> const& te)
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{
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return te.get();
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}
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template<std::size_t I, class T>
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constexpr
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T&&
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get(tuple_element_impl<I, T>&& te)
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{
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return std::move(te.get());
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}
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template<std::size_t I, class T>
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constexpr
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T&
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get(tuple_element_impl<I, T&>&& te)
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{
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return te.get();
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}
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template<std::size_t I, class T>
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using tuple_element =
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typename boost::copy_cv<
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mp11::mp_at_c<typename
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remove_cv<T>::type,
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I>, T>::type;
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} // detail
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} // grammar
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} // urls
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} // boost
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#endif
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