counter.h

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#pragma once
 
template <typename T>
class Counter {
  static inline int total_ = 0,       
                    alive_ = 0,       
                    watermark_ = 0;   
protected:
  Counter() {
    total_++;
    if( ++alive_ > watermark_ )
      watermark_ = alive_;
  }
 
  Counter( const Counter<T> & /* unused*/ ) {
    total_++;
    if( ++alive_ > watermark_ )
      watermark_ = alive_;
  }
 
  ~Counter() { alive_--; }
 
public:
  // Delete the remaining ctors, until we need them. 
  Counter<T> & operator=( const Counter<T> & /* unused*/ ) = delete;
  Counter( Counter<T> && /* unused*/ ) = delete;
  Counter<T> & operator=( Counter<T> && /* unused*/ ) = delete;
 
public: /* accessor */
  static int getTotalCounter() { return total_; }
 
  static int getAliveCounter() { return alive_; }
 
  static int getWatermarkCounter() { return watermark_; }
};