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+/* <!-- 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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+
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+#include <utility>
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+
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+namespace aria2 {
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+
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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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+
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+ T1 first;
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+ T2 second;
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+ T3 third;
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+
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+ Triplet() {}
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+template<typename T1, typename T2, typename T3, size_t N>
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+struct TripletNthType;
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+
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+template<typename T1, typename T2, typename T3>
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+struct TripletNthType<T1, T2, T3, 1> {
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+ typedef T1 type;
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+};
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+
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+template<typename T1, typename T2, typename T3>
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+struct TripletNthType<T1, T2, T3, 2> {
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+ typedef T2 type;
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+};
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+
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+template<typename T1, typename T2, typename T3>
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+struct TripletNthType<T1, T2, T3, 3> {
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+ typedef T3 type;
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+};
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+
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+template<size_t N>
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+struct TripletGet;
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+
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+template<>
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+struct TripletGet<1> {
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+ template<typename T1, typename T2, typename T3>
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+ static T1 get(const Triplet<T1, T2, T3>& tri)
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+ {
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+ return tri.first;
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+ }
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+};
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+
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+template<>
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+struct TripletGet<2> {
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+ template<typename T1, typename T2, typename T3>
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+ static T2 get(const Triplet<T1, T2, T3>& tri)
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+ {
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+ return tri.second;
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+ }
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+};
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+
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+template<>
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+struct TripletGet<3> {
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+ template<typename T1, typename T2, typename T3>
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+ static T3 get(const Triplet<T1, T2, T3>& tri)
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+ {
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+ return tri.third;
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+ }
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+};
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+
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+template<size_t N1, size_t N2>
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+class Triplet2Pair {
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+public:
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+ template<typename T1, typename T2, typename T3>
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+ std::pair<typename TripletNthType<T1, T2, T3, N1>::type,
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+ typename TripletNthType<T1, T2, T3, N2>::type>
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+ operator()(const Triplet<T1, T2, T3>& tri) const
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+ {
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+ return std::make_pair<typename TripletNthType<T1, T2, T3, N1>::type,
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+ typename TripletNthType<T1, T2, T3, N2>::type>
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+ (TripletGet<N1>::get(tri), TripletGet<N2>::get(tri));
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+ }
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+};
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+
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+} // namespace aria2
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+
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+#endif // D_TRIPLET_H
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Tatsuhiro Tsujikawa