libcxx/test/std/containers/unord/unord.multiset/hash_function.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 // hasher hash_function() 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
  27   const set_type& cs = s;
  28   assert(cs.hash_function()(*i1) == cs.hash_function()(*i2));
  29   assert(cs.hash_function()(*i2) == cs.hash_function()(*i1));
  30
  31   return 0;
  32 }