EventToggle.h

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#pragma once
 
#include "pch.h"
 
using namespace std::chrono_literals;
 
template <typename Callable> class TurboEvent {
private:
    Callable callable;
    bool active{};
    std::chrono::steady_clock::time_point start{};
    std::chrono::milliseconds delay;
 
public:
    constexpr TurboEvent(Callable callable,
                         const std::chrono::milliseconds &delay)
        : callable(callable), delay(delay) {}
 
    constexpr auto operator()() {
        auto val = callable();
        if (!val) {
            active = false;
            return decltype(val){};
        }
        auto now = std::chrono::steady_clock::now();
        if (!active) {
            active = true;
            start = now;
        }
        auto diff = now - start;
        return diff / delay % 2 ? decltype(val){} : val;
    }
};
 
template <typename Callable> class ToggleEvent {
private:
    Callable callable;
    bool value{};
    std::chrono::steady_clock::time_point start{};
    std::chrono::milliseconds delay;
 
public:
    constexpr ToggleEvent(Callable callable,
                          const std::chrono::milliseconds &delay)
        : callable(callable), delay(delay) {}
 
    constexpr bool operator()() {
        if (callable()) {
            auto now = std::chrono::steady_clock::now();
            if (now > start + delay) {
                start = now;
                value = !value;
            }
        }
        return value;
    }
};