libcxx/test/std/containers/test_hash.h

   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 #ifndef TEST_HASH_H
  10 #define TEST_HASH_H
  11
  12 #include <cstddef>
  13 #include <type_traits>
  14
  15 template <class C>
  16 class test_hash
  17     : private C
  18 {
  19     int data_;
  20 public:
  21     explicit test_hash(int data = 0) : data_(data) {}
  22
  23     std::size_t
  24     operator()(typename std::add_lvalue_reference<const typename C::argument_type>::type x) const
  25         {return C::operator()(x);}
  26
  27     bool operator==(const test_hash& c) const
  28         {return data_ == c.data_;}
  29 };
  30
  31 #endif  // TEST_HASH_H