elapsedtimer.h

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#pragma once
 
#include <chrono>
#include <cstdint>
#include <promeki/core/namespace.h>
 
PROMEKI_NAMESPACE_BEGIN
 
class ElapsedTimer {
        public:
                ElapsedTimer() : _valid(true), _start(std::chrono::steady_clock::now()) {}
 
                void start() {
                        _start = std::chrono::steady_clock::now();
                        _valid = true;
                }
 
                int64_t restart() {
                        auto now = std::chrono::steady_clock::now();
                        int64_t ms = std::chrono::duration_cast<std::chrono::milliseconds>(now - _start).count();
                        _start = now;
                        _valid = true;
                        return ms;
                }
 
                int64_t elapsed() const {
                        return std::chrono::duration_cast<std::chrono::milliseconds>(
                                std::chrono::steady_clock::now() - _start
                        ).count();
                }
 
                int64_t elapsedUs() const {
                        return std::chrono::duration_cast<std::chrono::microseconds>(
                                std::chrono::steady_clock::now() - _start
                        ).count();
                }
 
                int64_t elapsedNs() const {
                        return std::chrono::duration_cast<std::chrono::nanoseconds>(
                                std::chrono::steady_clock::now() - _start
                        ).count();
                }
 
                bool hasExpired(int64_t ms) const {
                        return elapsed() >= ms;
                }
 
                bool isValid() const { return _valid; }
 
                void invalidate() { _valid = false; }
 
        private:
                bool _valid;
                std::chrono::steady_clock::time_point _start;
};
 
PROMEKI_NAMESPACE_END