counter.h

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#pragma once
 
template <typename T>
class Counter {
  static inline int counter_total_ = 0;     
  static inline int counter_alive_ = 0;     
protected:
  ~Counter() { counter_alive_--; }
 
public:
  Counter() {
    counter_total_++;
    counter_alive_++;
  }
 
  static int getTotalCounter() { return counter_total_; }
 
  static int getAliveCounter() { return counter_alive_; }
};