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#pragma once
#include <cstddef>
#include <atomic>
/**
* Simple thread-safe per-class counter that can be used to make sure you don't
* have any leaks in your code, or for statistical purposes.
*
* Example usage:
* \code
* class TMyClass: public TObjectCounter<TMyClass> {
* // ...
* };
*
* // In your code:
* Cerr << "TMyClass instances in use: " << TMyClass::ObjectCount() << Endl;
* \endcode
*/
template <class T>
class TObjectCounter {
public:
inline TObjectCounter() noexcept {
++Count_;
}
inline TObjectCounter(const TObjectCounter& /*item*/) noexcept {
++Count_;
}
inline ~TObjectCounter() {
--Count_;
}
static inline long ObjectCount() noexcept {
return Count_.load();
}
/**
* Resets object count. Mainly for tests, as you don't want to do this in
* your code and then end up with negative counts.
*
* \returns Current object count.
*/
static inline long ResetObjectCount() noexcept {
return Count_.exchange(0);
}
private:
static std::atomic<intptr_t> Count_;
};
template <class T>
std::atomic<intptr_t> TObjectCounter<T>::Count_ = 0;
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