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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
//
//===----------------------------------------------------------------------===//
// <map>
// class value_compare
// bool operator()( const value_type& lhs, const value_type& rhs ) const;
#include <map>
#include <cassert>
#include <string>
#include <utility>
template <typename Map>
struct CallCompMember : Map::value_compare {
CallCompMember(const typename Map::value_compare& vc) : Map::value_compare(vc) {}
typedef typename Map::value_type value_type;
bool operator()(const value_type& value1, const value_type& value2) const {
return this->comp(value1.first, value2.first);
}
};
int main(int, char**) {
typedef std::map<int, std::string> map_type;
map_type m;
std::pair<map_type::iterator, bool> p1 = m.insert(map_type::value_type(1, "abc"));
std::pair<map_type::iterator, bool> p2 = m.insert(map_type::value_type(2, "abc"));
const map_type::value_compare vc = m.value_comp();
CallCompMember<map_type> call_comp = m.value_comp();
assert(vc(*p1.first, *p2.first));
assert(call_comp(*p1.first, *p2.first));
assert(!vc(*p2.first, *p1.first));
assert(!call_comp(*p2.first, *p1.first));
return 0;
}
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