libcxx/test/std/containers/test_compare.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_COMPARE_H
  10 #define TEST_COMPARE_H
  11
  12 #include <cstddef>
  13 #include <type_traits>
  14 #include <cstdlib>
  15 #include <new>
  16 #include <climits>
  17
  18 template <class C>
  19 class test_compare
  20     : private C
  21 {
  22     int data_;
  23 public:
  24     explicit test_compare(int data = 0) : data_(data) {}
  25
  26     typename C::result_type
  27     operator()(typename std::add_lvalue_reference<const typename C::first_argument_type>::type x,
  28                typename std::add_lvalue_reference<const typename C::second_argument_type>::type y) const
  29         {return C::operator()(x, y);}
  30
  31     bool operator==(const test_compare& c) const
  32         {return data_ == c.data_;}
  33 };
  34
  35
  36 template <class C>
  37 class non_const_compare
  38 {
  39 // operator() deliberately not marked as 'const'
  40     bool operator()(const C& x, const C& y) { return x < y; }
  41 };
  42
  43
  44 #endif  // TEST_COMPARE_H