| //===----------------------------------------------------------------------===// |
| // |
| // 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; |
| } |