libcxx/test/std/containers/unord/unord.multiset/key_eq.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 // <unordered_set>
  10
  11 // template <class Value, class Hash = hash<Value>, class Pred = equal_to<Value>,
  12 //           class Alloc = allocator<Value>>
  13 // class unordered_multiset
  14
  15 // key_equal key_eq() const;
  16
  17 #include <unordered_set>
  18 #include <cassert>
  19
  20 int main(int, char**) {
  21   typedef std::unordered_multiset<int> set_type;
  22   set_type s;
  23
  24   set_type::iterator i1 = s.insert(1);
  25   set_type::iterator i2 = s.insert(1);
  26   set_type::iterator i3 = s.insert(2);
  27
  28   const set_type& cs = s;
  29
  30   assert(cs.key_eq()(*i1, *i1));
  31   assert(cs.key_eq()(*i2, *i2));
  32   assert(cs.key_eq()(*i3, *i3));
  33
  34   assert(cs.key_eq()(*i1, *i2));
  35   assert(cs.key_eq()(*i2, *i1));
  36
  37   assert(!cs.key_eq()(*i1, *i3));
  38   assert(!cs.key_eq()(*i3, *i1));
  39
  40   assert(!cs.key_eq()(*i2, *i3));
  41   assert(!cs.key_eq()(*i3, *i2));
  42
  43   return 0;
  44 }