01c1c6fcc7
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@227359 91177308-0d34-0410-b5e6-96231b3b80d8
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef COUNTER_H
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#define COUNTER_H
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#include <functional> // for std::hash
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struct Counter_base { static int gConstructed; };
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template <typename T>
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class Counter : public Counter_base
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{
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public:
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Counter() : data_() { ++gConstructed; }
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Counter(const T &data) : data_(data) { ++gConstructed; }
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Counter(const Counter& rhs) : data_(rhs.data_) { ++gConstructed; }
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Counter& operator=(const Counter& rhs) { ++gConstructed; data_ = rhs.data_; return *this; }
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#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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Counter(Counter&& rhs) : data_(std::move(rhs.data_)) { ++gConstructed; }
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Counter& operator=(Counter&& rhs) { ++gConstructed; data_ = std::move(rhs.data_); return *this; }
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#endif
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~Counter() { --gConstructed; }
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const T& get() const {return data_;}
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bool operator==(const Counter& x) const {return data_ == x.data_;}
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bool operator< (const Counter& x) const {return data_ < x.data_;}
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private:
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T data_;
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};
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int Counter_base::gConstructed = 0;
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namespace std {
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template <class T>
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struct hash<Counter<T> >
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: public std::unary_function<Counter<T>, std::size_t>
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{
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std::size_t operator()(const Counter<T>& x) const {return std::hash<T>(x.get());}
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};
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}
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#endif
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