click.hpp

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#ifndef MSTL_CORE_TIME_CLICK_HPP__
#define MSTL_CORE_TIME_CLICK_HPP__

 
#include "MSTL/core/time/clocks.hpp"
MSTL_BEGIN_NAMESPACE__


struct click {
    using time_point = system_clock::time_point; 
 
    time_point start_time{}; 
    time_point last_time{};  
    bool started = false;    
    bool stopped = false;    

    void start() noexcept {
        start_time = system_clock::now();
        started = true;
        stopped = false;
    }

    void update() noexcept {
        last_time = system_clock::now();
    }

    void stop() noexcept {
        last_time = system_clock::now();
        stopped = true;
    }

    nanoseconds during() const {
        if (!started || !stopped) {
            throw_exception(value_exception("click not properly started/stopped"));
        }
        return last_time - start_time;
    }

    nanoseconds during_s() const noexcept {
        if (!started || !stopped) {
            return nanoseconds{0};
        }
        const auto diff = last_time - start_time;
        return diff.count() >= 0 ? diff.to_nano() : 0_ns;
    }

    void reset() noexcept {
        started = false;
        stopped = false;
        start_time = time_point{};
        last_time = time_point{};
    }
};
 

class click_guard {
    click& clk_;  
 
public:
    explicit click_guard(click& clk) noexcept : clk_(clk) {
        clk_.start();
    }

    click_guard(const click_guard&) = delete;

    click_guard& operator =(const click_guard&) = delete;

    ~click_guard() noexcept {
        clk_.stop();
    }
};
 // Click
 
MSTL_END_NAMESPACE__
#endif // MSTL_CORE_TIME_CLICK_HPP__