watermark.h

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#pragma once
 
#include "error.h"
 
 
class Watermark {
  size_t counter_ = 0,     
         watermark_ = 0;   
public: /* accessor */
  size_t getCounter() const { return counter_; }
 
 
  size_t getWatermark() const { return watermark_; }
 
 
public: /* other */
  void inc() {
    if( ++counter_ > watermark_ )
      watermark_ = counter_;
  }
 
 
  void dec() {
    if( counter_-- == 0 )
      inErrExit( internal, "watermark below zero" );    /* LCOV_EXCL_LINE */  // See #88
  }
 
 
  void set( size_t p_size ) {
    counter_ = p_size;
    if( counter_ > watermark_ )
      watermark_ = counter_;
  }
};