libcxx/test/std/containers/associative/map/map.ops/contains_transparent.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10
  11 #include <cassert>
  12 #include <map>
  13
  14 // <map>
  15
  16 // template<class K> bool contains(const K& x) const; // C++20
  17
  18 struct Comp {
  19   using is_transparent = void;
  20
  21   bool operator()(const std::pair<int, int>& lhs,
  22                   const std::pair<int, int>& rhs) const {
  23     return lhs < rhs;
  24   }
  25
  26   bool operator()(const std::pair<int, int>& lhs, int rhs) const {
  27     return lhs.first < rhs;
  28   }
  29
  30   bool operator()(int lhs, const std::pair<int, int>& rhs) const {
  31     return lhs < rhs.first;
  32   }
  33 };
  34
  35 template <typename Container>
  36 void test() {
  37   Container s{{{2, 1}, 1}, {{1, 2}, 2}, {{1, 3}, 3}, {{1, 4}, 4}, {{2, 2}, 5}};
  38
  39   assert(s.contains(1));
  40   assert(!s.contains(-1));
  41 }
  42
  43 int main(int, char**) {
  44   test<std::map<std::pair<int, int>, int, Comp> >();
  45   test<std::multimap<std::pair<int, int>, int, Comp> >();
  46
  47   return 0;
  48 }