Stopwatch.h

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#ifndef STOPWATCH_H
#define STOPWATCH_H
 
#include <chrono>
#include <map>
#include <ostream>
 
namespace stopwatch
{
    using Clock = std::chrono::system_clock;
    using Duration = std::chrono::duration<float>; // seconds
    using TimePoint = std::chrono::time_point<Clock>;
 
    class Stats
    {
    public:
        Stats() : numExecutions(0)
        {
        }
 
        std::size_t numExecutions;
        Duration totalExecutionTime;
 
        Duration averageExecutionTime;
        Duration latestExecutionTime;
 
        friend std::ostream& operator<<(std::ostream& os, const Stats& stats);
    };
 
    class Stopwatch
    {
 
    public:
        Stopwatch();
 
        void reset();
        void start(const std::string& tag);
        void stop(const std::string& tag);
 
        const Stats& getStats(const std::string& tag);
 
        friend std::ostream& operator<<(std::ostream& os, const Stopwatch& stats);
 
    private:
        std::map<std::string, Stats> statsMap;
        std::map<std::string, TimePoint> currentStarts;
    };
 
} // namespace stopwatch
 
#endif // STOPWATCH_H