timer.h

//
// Created by sbian on 2019/9/5.
//

#ifndef BIM_TIMER_H
#define BIM_TIMER_H

#include <chrono>

class Timer
{
private:
    std::chrono::high_resolution_clock::time_point __StartTime, __LastTime, __EndTime;
    const char* __processName;
public:
    Timer()
    {
        __StartTime = std::chrono::high_resolution_clock::now();
        __LastTime = __StartTime, __EndTime = __StartTime;
        __processName = "Unnamed";
    }

    explicit Timer(const char* processName)
    {
        __StartTime = std::chrono::high_resolution_clock::now();
        __LastTime = __StartTime, __EndTime = __StartTime;
        __processName = processName;
    }

    /// Refresh time
    void refresh_time()
    {
        __StartTime = std::chrono::high_resolution_clock::now();
        __LastTime = __StartTime, __EndTime = __StartTime;
    }

    /// Record current time
    void record_current_time()
    {
        __LastTime = __EndTime;
        __EndTime = std::chrono::high_resolution_clock::now();
    };
    /// Get the operation time from the last recorded moment
    double get_operation_time()
    {
        this->record_current_time();
        std::chrono::duration<double> elapsed = __EndTime - __LastTime;
        return elapsed.count();
    }

    /// Print the operation time from the last recorded moment
    void log_operation_time()
    {
        const double duration = this->get_operation_time();
        std::cout << "->Time used (sec): " << duration << '\n';
    }

    /// Print the operation time from the last recorded moment with a given name
    void log_operation_time(const char* operationName)
    {
        const double duration = this->get_operation_time();
        std::cout << "->Time used (sec) for operation [" << operationName << "]: " << duration << '\n';
    }

    /// Get the total time from the beginning
    double get_total_time()
    {
        this->record_current_time();
        std::chrono::duration<double> elapsed = __EndTime - __StartTime;
        return elapsed.count();
    }

    /// Print the total time from the beginning
    void log_total_time()
    {
        const double duration = this->get_total_time();
        std::cout << "--->Time used (sec) for process [" << __processName << "]: " << duration << '\n';
    }

    /// Print the total time from the beginning to the last recorded moment
    void log_sub_total_time() const
    {
        std::chrono::duration<double> elapsed = __EndTime - __StartTime;
        std::cout << "--->Time used (sec) for process [" << __processName << "]: " << elapsed.count() << '\n';
    }
};

using TTimer = Timer;
using PTimer = std::shared_ptr<Timer>;

#endif //BIM_TIMER_H