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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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef COUNTER_H10#define COUNTER_H11 12#include <functional> // for std::hash13 14#include "test_macros.h"15 16struct Counter_base { static int gConstructed; };17 18template <typename T>19class Counter : public Counter_base20{21public: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 >= 1127 Counter(Counter&& rhs) : data_(std::move(rhs.data_)) { ++gConstructed; }28 Counter& operator=(Counter&& rhs) { data_ = std::move(rhs.data_); return *this; }29#endif30 ~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 37private:38 T data_;39};40 41int Counter_base::gConstructed = 0;42 43template <class T>44struct std::hash<Counter<T> > {45 typedef Counter<T> argument_type;46 typedef std::size_t result_type;47 48 std::size_t operator()(const Counter<T>& x) const { return std::hash<T>()(x.get()); }49};50 51#endif52