321 lines
8.2 KiB
C++
321 lines
8.2 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2011.
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/container for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_CONTAINERS_CONTAINERS_DETAIL_PAIR_HPP
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#define BOOST_CONTAINERS_CONTAINERS_DETAIL_PAIR_HPP
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#if (defined _MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif
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#include "config_begin.hpp"
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#include <boost/container/detail/workaround.hpp>
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#include <boost/container/detail/mpl.hpp>
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#include <boost/container/detail/type_traits.hpp>
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#include <utility> //std::pair
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#include <boost/move/move.hpp>
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#include <boost/type_traits/is_class.hpp>
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#ifndef BOOST_CONTAINERS_PERFECT_FORWARDING
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#include <boost/container/detail/preprocessor.hpp>
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#endif
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namespace boost {
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namespace container {
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namespace containers_detail {
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template <class T1, class T2>
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struct pair;
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template <class T>
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struct is_pair
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{
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static const bool value = false;
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};
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template <class T1, class T2>
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struct is_pair< pair<T1, T2> >
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{
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static const bool value = true;
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};
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template <class T1, class T2>
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struct is_pair< std::pair<T1, T2> >
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{
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static const bool value = true;
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};
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struct pair_nat;
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struct piecewise_construct_t { };
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static const piecewise_construct_t piecewise_construct = piecewise_construct_t();
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template <class T1, class T2>
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struct pair
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{
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private:
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BOOST_COPYABLE_AND_MOVABLE(pair)
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public:
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typedef T1 first_type;
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typedef T2 second_type;
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T1 first;
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T2 second;
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//Default constructor
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pair()
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: first(), second()
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{}
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/*
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//pair from two values
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pair(const T1 &t1, const T2 &t2)
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: first(t1)
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, second(t2)
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{}
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//pair from two values
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pair(BOOST_RV_REF(T1) t1, BOOST_RV_REF(T2) t2)
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: first(::boost::move(t1))
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, second(::boost::move(t2))
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{}
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*/
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template<class U, class V>
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pair(BOOST_FWD_REF(U) u, BOOST_FWD_REF(V) v)
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: first(::boost::forward<U>(u))
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, second(::boost::forward<V>(v))
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{}
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//pair copy assignment
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pair(const pair& x)
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: first(x.first), second(x.second)
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{}
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template <class D, class S>
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pair(const pair<D, S> &p)
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: first(p.first), second(p.second)
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{}
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//pair move constructor
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pair(BOOST_RV_REF(pair) p)
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: first(::boost::move(p.first)), second(::boost::move(p.second))
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{}
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template <class D, class S>
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pair(BOOST_RV_REF_2_TEMPL_ARGS(pair, D, S) p)
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: first(::boost::move(p.first)), second(::boost::move(p.second))
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{}
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//std::pair copy constructor
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pair(const std::pair<T1, T2>& x)
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: first(x.first), second(x.second)
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{}
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template <class D, class S>
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pair(const std::pair<D, S>& p)
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: first(p.first), second(p.second)
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{}
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//std::pair move constructor
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template <class D, class S>
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pair(BOOST_RV_REF_2_TEMPL_ARGS(std::pair, D, S) p)
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: first(::boost::move(p.first)), second(::boost::move(p.second))
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{}
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pair(BOOST_RV_REF_2_TEMPL_ARGS(std::pair, T1, T2) p)
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: first(::boost::move(p.first)), second(::boost::move(p.second))
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{}
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//piecewise_construct missing
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/*
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//Variadic versions
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template<class U>
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pair(BOOST_CONTAINERS_PARAM(U, u), typename containers_detail::disable_if
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< containers_detail::is_pair< typename containers_detail::remove_ref_const<U>::type >, pair_nat>::type* = 0)
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: first(::boost::forward<U>(u))
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, second()
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{}
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#ifdef BOOST_CONTAINERS_PERFECT_FORWARDING
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template<class U, class V, class ...Args>
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pair(U &&u, V &&v)
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: first(::boost::forward<U>(u))
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, second(::boost::forward<V>(v), ::boost::forward<Args>(args)...)
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{}
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#else
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#define BOOST_PP_LOCAL_MACRO(n) \
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template<class U, BOOST_PP_ENUM_PARAMS(n, class P)> \
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pair(BOOST_CONTAINERS_PARAM(U, u) \
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,BOOST_PP_ENUM(n, BOOST_CONTAINERS_PP_PARAM_LIST, _)) \
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: first(::boost::forward<U>(u)) \
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, second(BOOST_PP_ENUM(n, BOOST_CONTAINERS_PP_PARAM_FORWARD, _)) \
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{} \
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//!
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#define BOOST_PP_LOCAL_LIMITS (1, BOOST_CONTAINERS_MAX_CONSTRUCTOR_PARAMETERS)
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#include BOOST_PP_LOCAL_ITERATE()
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#endif
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*/
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//pair copy assignment
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pair& operator=(BOOST_COPY_ASSIGN_REF(pair) p)
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{
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first = p.first;
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second = p.second;
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return *this;
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}
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template <class D, class S>
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pair& operator=(const pair<D, S>&p)
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{
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first = p.first;
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second = p.second;
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return *this;
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}
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//pair move assignment
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pair& operator=(BOOST_RV_REF(pair) p)
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{
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first = ::boost::move(p.first);
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second = ::boost::move(p.second);
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return *this;
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}
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template <class D, class S>
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pair& operator=(BOOST_RV_REF_2_TEMPL_ARGS(pair, D, S) p)
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{
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first = ::boost::move(p.first);
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second = ::boost::move(p.second);
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return *this;
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}
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//std::pair copy assignment
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pair& operator=(const std::pair<T1, T2> &p)
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{
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first = p.first;
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second = p.second;
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return *this;
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}
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template <class D, class S>
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pair& operator=(const std::pair<D, S> &p)
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{
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first = ::boost::move(p.first);
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second = ::boost::move(p.second);
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return *this;
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}
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//std::pair move assignment
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pair& operator=(BOOST_RV_REF_2_TEMPL_ARGS(std::pair, T1, T2) p)
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{
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first = ::boost::move(p.first);
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second = ::boost::move(p.second);
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return *this;
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}
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template <class D, class S>
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pair& operator=(BOOST_RV_REF_2_TEMPL_ARGS(std::pair, D, S) p)
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{
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first = ::boost::move(p.first);
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second = ::boost::move(p.second);
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return *this;
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}
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//swap
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void swap(pair& p)
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{
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using std::swap;
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swap(this->first, p.first);
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swap(this->second, p.second);
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}
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};
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template <class T1, class T2>
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inline bool operator==(const pair<T1,T2>& x, const pair<T1,T2>& y)
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{ return static_cast<bool>(x.first == y.first && x.second == y.second); }
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template <class T1, class T2>
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inline bool operator< (const pair<T1,T2>& x, const pair<T1,T2>& y)
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{ return static_cast<bool>(x.first < y.first ||
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(!(y.first < x.first) && x.second < y.second)); }
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template <class T1, class T2>
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inline bool operator!=(const pair<T1,T2>& x, const pair<T1,T2>& y)
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{ return static_cast<bool>(!(x == y)); }
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template <class T1, class T2>
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inline bool operator> (const pair<T1,T2>& x, const pair<T1,T2>& y)
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{ return y < x; }
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template <class T1, class T2>
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inline bool operator>=(const pair<T1,T2>& x, const pair<T1,T2>& y)
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{ return static_cast<bool>(!(x < y)); }
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template <class T1, class T2>
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inline bool operator<=(const pair<T1,T2>& x, const pair<T1,T2>& y)
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{ return static_cast<bool>(!(y < x)); }
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template <class T1, class T2>
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inline pair<T1, T2> make_pair(T1 x, T2 y)
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{ return pair<T1, T2>(x, y); }
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template <class T1, class T2>
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inline void swap(pair<T1, T2>& x, pair<T1, T2>& y)
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{
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swap(x.first, y.first);
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swap(x.second, y.second);
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}
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} //namespace containers_detail {
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} //namespace container {
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//Without this specialization recursive flat_(multi)map instantiation fails
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//because is_enum needs to instantiate the recursive pair, leading to a compilation error).
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//This breaks the cycle clearly stating that pair is not an enum avoiding any instantiation.
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template<class T>
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struct is_enum;
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template<class T, class U>
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struct is_enum< ::boost::container::containers_detail::pair<T, U> >
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{
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static const bool value = false;
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};
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//This specialization is needed to avoid instantiation of pair in
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//is_class, and allow recursive maps.
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template <class T1, class T2>
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struct is_class< ::boost::container::containers_detail::pair<T1, T2> >
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: public ::boost::true_type
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{};
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#ifdef BOOST_NO_RVALUE_REFERENCES
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template<class T1, class T2>
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struct has_move_emulation_enabled< ::boost::container::containers_detail::pair<T1, T2> >
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: ::boost::true_type
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{};
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#endif
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} //namespace boost {
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#include <boost/container/detail/config_end.hpp>
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#endif //#ifndef BOOST_CONTAINERS_DETAIL_PAIR_HPP
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