pair.hpp

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/*
 * This file is part of Algorithms library toolkit.
 * Copyright (C) 2017 Jan Travnicek (jan.travnicek@fit.cvut.cz)
 
 * Algorithms library toolkit is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 
 * Algorithms library toolkit is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 
 * You should have received a copy of the GNU General Public License
 * along with Algorithms library toolkit.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include <ext/ostream>
 
#include <extensions/type_traits.hpp>
#include <extensions/utility.hpp>
 
namespace ext {
 
template < class T, class R >
class pair : public std::pair < T, R > {
public:
    using std::pair < T, R >::pair; // NOLINT(modernize-use-equals-default)
 
    using std::pair < T, R >::operator =;
#ifndef __clang__
 
    pair ( const pair & other ) = default;
 
    pair ( pair && other ) = default;
 
    pair & operator = ( pair && other ) = default;
 
    pair & operator = ( const pair & other ) = default;
#endif
};
 
template<typename T1, typename T2>
constexpr auto make_pair ( T1 && x, T2 && y ) {
    typedef typename ext::strip_reference_wrapper < std::decay_t < T1 > >::type ds_type1;
    typedef typename ext::strip_reference_wrapper < std::decay_t < T2 > >::type ds_type2;
    return pair < ds_type1, ds_type2 > ( std::forward < T1 > ( x ), std::forward < T2 > ( y ) );
}
 
template< class T, class R >
ext::ostream& operator<<(ext::ostream& out, const ext::pair<T, R>& pair) {
    out << "(" << pair.first << ", " << pair.second << ")";
    return out;
}
 
} /* namespace ext */
 
namespace std {
 
template < class First, class Second >
struct tuple_size < ext::pair < First, Second > > : public std::integral_constant < std::size_t, 2 > { };
 
template < std::size_t I, class First, class Second >
struct tuple_element < I, ext::pair < First, Second > > {
    typedef typename std::tuple_element < I, std::pair < First, Second > >::type type;
};
 
} /* namespace std */