Chrono.h

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* (c) Copyright 1998-2025 CERN for the benefit of the LHCb and ATLAS collaborations *
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* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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#pragma once
 
#include <GaudiKernel/ChronoEntity.h>
#include <GaudiKernel/IChronoSvc.h>
#include <GaudiKernel/Kernel.h>
#include <string>
 
class GAUDI_API Chrono {
public:
  Chrono( IChronoSvc*        svc = nullptr,            // the service
          const std::string& tag = "CHRONO::UNNAMED" ) // the unique tag/name
  {
    if ( svc ) { m_chrono = svc->chronoStart( tag ); }
  }
 
  Chrono( Chrono&& rhs ) {
    m_chrono     = rhs.m_chrono;
    rhs.m_chrono = nullptr;
  }
 
  Chrono( const std::string& tag, // the unique tag/name
          IChronoSvc*        svc )       // the service
  {
    if ( svc ) { m_chrono = svc->chronoStart( tag ); }
  }
 
  Chrono( ChronoEntity* c ) : m_chrono( c ) {
    if ( m_chrono ) { m_chrono->start(); }
  }
 
  Chrono( ChronoEntity& c ) : m_chrono( &c ) { m_chrono->start(); }
 
  ~Chrono() {
    if ( m_chrono ) { m_chrono->stop(); }
  }
 
private:
  Chrono( const Chrono& )            = delete;
  Chrono& operator=( const Chrono& ) = delete;
 
  ChronoEntity* m_chrono = nullptr; // The actual chronometer
};