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// -*- c++ -*-
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#ifndef EXTENDED_PAIR_H
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#define EXTENDED_PAIR_H
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template <typename T1, typename A1, typename T2, typename A2>
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struct extended_pair {
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typedef T1 first_type;
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typedef T2 second_type;
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extended_pair() : first(), second() {}
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extended_pair(A1 f, A2 s) : first(f), second(s) {}
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template <class Pair>
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extended_pair(const Pair& pair) : first(pair.first), second(pair.second) {}
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T1 first;
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T2 second;
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};
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template <typename T1, typename T2,
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typename LA1, typename LA2, typename RA1, typename RA2>
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bool operator==(const extended_pair<T1, LA1, T2, LA2>& left,
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const extended_pair<T1, RA1, T2, RA2>& right) {
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return left.first == right.first && left.second == right.second;
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}
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template <typename T1, typename T2,
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typename LA1, typename LA2, typename RA1, typename RA2>
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bool operator!=(const extended_pair<T1, LA1, T2, LA2>& left,
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const extended_pair<T1, RA1, T2, RA2>& right) {
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return !(left == right);
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}
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template <typename T1, typename T2,
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typename LA1, typename LA2, typename RA1, typename RA2>
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bool operator<(const extended_pair<T1, LA1, T2, LA2>& left,
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const extended_pair<T1, RA1, T2, RA2>& right) {
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if (left.first == right.first) return left.second == right.second;
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return left.first < right.first;
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}
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template <typename T1, typename T2,
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typename LA1, typename LA2, typename RA1, typename RA2>
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bool operator>(const extended_pair<T1, LA1, T2, LA2>& left,
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const extended_pair<T1, RA1, T2, RA2>& right) {
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return right < left;
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}
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template <typename T1, typename T2,
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typename LA1, typename LA2, typename RA1, typename RA2>
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bool operator<=(const extended_pair<T1, LA1, T2, LA2>& left,
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const extended_pair<T1, RA1, T2, RA2>& right) {
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return !(right > left);
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}
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template <typename T1, typename T2,
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typename LA1, typename LA2, typename RA1, typename RA2>
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bool operator>=(const extended_pair<T1, LA1, T2, LA2>& left,
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const extended_pair<T1, RA1, T2, RA2>& right) {
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return !(right < left);
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}
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#endif
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