mirror of https://github.com/aria2/aria2
153 lines
4.1 KiB
C++
153 lines
4.1 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2010 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#ifndef D_TRIPLET_H
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#define D_TRIPLET_H
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#include <cstdlib>
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#include <utility>
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namespace aria2 {
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template<typename T1, typename T2, typename T3>
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struct Triplet {
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typedef T1 first_type;
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typedef T2 second_type;
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typedef T3 third_type;
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T1 first;
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T2 second;
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T3 third;
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Triplet() {}
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Triplet(const T1& t1, const T2& t2, const T3& t3):
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first(t1), second(t2), third(t3) {}
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template<typename U1, typename U2, typename U3>
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Triplet(const Triplet<U1, U2, U3>& t):
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first(t.first), second(t.second), third(t.third) {}
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Triplet& operator=(const Triplet& tri)
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{
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if(this != &tri) {
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first = tri.first;
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second = tri.second;
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third = tri.third;
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}
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return *this;
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}
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};
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template<typename T1, typename T2, typename T3>
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bool operator<(const Triplet<T1, T2, T3>& lhs, const Triplet<T1, T2, T3>& rhs)
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{
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return lhs.first < rhs.first ||
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(!(rhs.first < lhs.first) && (lhs.second < rhs.second ||
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(!(rhs.second < lhs.second) &&
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lhs.third < rhs.third)));
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}
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template<typename T1, typename T2, typename T3>
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Triplet<T1, T2, T3> makeTriplet(const T1& t1, const T2& t2, const T3& t3)
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{
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return Triplet<T1, T2, T3>(t1, t2, t3);
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}
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template<class Tuple, size_t N>
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struct TupleNthType;
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template<class Tuple>
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struct TupleNthType<Tuple, 1> {
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typedef typename Tuple::first_type type;
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};
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template<class Tuple>
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struct TupleNthType<Tuple, 2> {
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typedef typename Tuple::second_type type;
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};
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template<class Tuple>
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struct TupleNthType<Tuple, 3> {
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typedef typename Tuple::third_type type;
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};
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template<size_t N>
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struct TupleGet;
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template<>
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struct TupleGet<1> {
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template<class Tuple>
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static typename TupleNthType<Tuple, 1>::type get(const Tuple& tri)
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{
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return tri.first;
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}
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};
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template<>
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struct TupleGet<2> {
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template<class Tuple>
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static typename TupleNthType<Tuple, 2>::type get(const Tuple& tri)
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{
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return tri.second;
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}
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};
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template<>
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struct TupleGet<3> {
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template<class Tuple>
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static typename TupleNthType<Tuple, 3>::type get(const Tuple& tri)
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{
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return tri.third;
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}
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};
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template<size_t N1, size_t N2>
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class Tuple2Pair {
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public:
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template<class Tuple>
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std::pair<typename TupleNthType<Tuple, N1>::type,
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typename TupleNthType<Tuple, N2>::type>
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operator()(const Tuple& tri) const
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{
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return std::make_pair<typename TupleNthType<Tuple, N1>::type,
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typename TupleNthType<Tuple, N2>::type>
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(TupleGet<N1>::get(tri), TupleGet<N2>::get(tri));
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}
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};
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} // namespace aria2
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#endif // D_TRIPLET_H
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