uox3/source/EventTimer.hpp

#ifndef EventTimer_hpp
#define EventTimer_hpp
#include <chrono>
#include <cstdint>
#include <string>


// A few instrumentation macros
// This estabishs a timer, and state determines if on/off
#define EVENT_TIMER( varname, state ) \
constexpr auto TIMER_##varname = state; \
auto varname = EventTimer();

#if !defined( EVENT_TIMER_ON )
#define EVENT_TIMER_ON 1
#endif
#if !defined( EVENT_TIMER_OFF )
#define EVENT_TIMER_OFF 0
#endif
#if !defined( EVENT_TIMER_CLEAR )
#define EVENT_TIMER_CLEAR 1
#endif
#if !defined( EVENT_TIMER_KEEP )
#define EVENT_TIMER_KEEP 0
#endif

// This prints out the delta time in millisconds for the timer since the last reset.
// The msg variable is the message you want with the time (no quotes around it, just text (so you cant use , in the message)
// reset tells the timer if it should reset the time count, or continue without resetting
#define EVENT_TIMER_NOW( varname, msg, Reset ) \
if constexpr ( TIMER_##varname ) { varname.Output( #msg, Reset ); }

// This resets the timer 
#define EVENT_TIMER_RESET( varname ) if constexpr ( TIMER_##varname ) { varname.Elapsed( true ); }

/*
#define EVENT_TIMER_OFF ( #varnam, #msg) \
#if defined(TIMER_ON) \
varname.output("msg"); \
#endif

*/


//=========================================================
class EventTimer
{
private:
	std::chrono::high_resolution_clock::time_point _now;
public:
	EventTimer();
	[[maybe_unused]] auto Elapsed( bool reset = true ) -> long long;
	auto Output( const std::string &label, bool reset = true ) -> void;
};
#endif /* EventTimer_hpp */