libcxx/test/support/Counter.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 COUNTER_H
  10 #define COUNTER_H
  11
  12 #include <functional> // for std::hash
  13
  14 #include "test_macros.h"
  15
  16 struct Counter_base { static int gConstructed; };
  17
  18 template <typename T>
  19 class Counter : public Counter_base
  20 {
  21 public:
  22     Counter() : data_()                             { ++gConstructed; }
  23     Counter(const T &data) : data_(data)            { ++gConstructed; }
  24     Counter(const Counter& rhs) : data_(rhs.data_)  { ++gConstructed; }
  25     Counter& operator=(const Counter& rhs)          { data_ = rhs.data_; return *this; }
  26 #if TEST_STD_VER >= 11
  27     Counter(Counter&& rhs) : data_(std::move(rhs.data_))  { ++gConstructed; }
  28     Counter& operator=(Counter&& rhs) { data_ = std::move(rhs.data_); return *this; }
  29 #endif
  30     ~Counter() { --gConstructed; }
  31
  32     const T& get() const {return data_;}
  33
  34     bool operator==(const Counter& x) const {return data_ == x.data_;}
  35     bool operator< (const Counter& x) const {return data_ <  x.data_;}
  36
  37 private:
  38     T data_;
  39 };
  40
  41 int Counter_base::gConstructed = 0;
  42
  43 namespace std {
  44
  45 template <class T>
  46 struct hash<Counter<T> >
  47 {
  48     typedef Counter<T> argument_type;
  49     typedef std::size_t result_type;
  50
  51     std::size_t operator()(const Counter<T>& x) const {return std::hash<T>()(x.get());}
  52 };
  53 }
  54
  55 #endif