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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11
// <set>
// class set
// template<typename K>
// pair<iterator,iterator> equal_range(const K& x); //
// C++14
// template<typename K>
// pair<const_iterator,const_iterator> equal_range(const K& x) const; //
// C++14
#include <cassert>
#include <set>
#include <utility>
struct Comp {
using is_transparent = void;
bool operator()(const std::pair<int, int>& lhs, const std::pair<int, int>& rhs) const { return lhs < rhs; }
bool operator()(const std::pair<int, int>& lhs, int rhs) const { return lhs.first < rhs; }
bool operator()(int lhs, const std::pair<int, int>& rhs) const { return lhs < rhs.first; }
};
int main(int, char**) {
std::set<std::pair<int, int>, Comp> s{{2, 1}, {1, 2}, {1, 3}, {1, 4}, {2, 2}};
auto er = s.equal_range(1);
long nels = 0;
for (auto it = er.first; it != er.second; it++) {
assert(it->first == 1);
nels++;
}
assert(nels == 3);
return 0;
}
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