Event.hpp

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// BSD 2-Clause License
//
// Copyright (c) 2022, Matthew McCall
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
//
// Created by Matthew McCall on 8/20/22.
//
 
#ifndef SILICON_EVENT_HPP
#define SILICON_EVENT_HPP
 
#include <algorithm>
#include <cstdint>
#include <functional>
 
#include "SDL_events.h"
 
#include "Types.hpp"
 
namespace Si {
namespace Event {
 
    struct AppQuit {};
    
    struct WindowResize {};
    
    void Process();
 
}
 
template <typename T>
void Pub(const T& data);
 
template <typename T>
class Sub
{
    friend void Si::Pub<T>(const T& data);
    using Callback = std::function<void(const T&)>;
 
public:
    explicit Sub(Callback func)
        : Func(func)
    {
        Sub<T>::Subscribers.push_back(NotNull<Sub<T>*>(this));
    }
 
    ~Sub()
    {
        const auto& i = std::find(Sub<T>::Subscribers.begin(), Sub<T>::Subscribers.end(), this);
 
        if (i != Sub<T>::Subscribers.end())
            Sub<T>::Subscribers.erase(i);
    }
 
private:
    static std::vector<NotNull<Sub<T>*>> Subscribers;
    Callback Func;
};
 
template <class T>
void Pub(const T& data)
{
    for (Sub<T>* i : Sub<T>::Subscribers) {
        i->Func(data);
    }
}
 
template <typename T>
std::vector<NotNull<Sub<T>*>> Sub<T>::Subscribers;
 
}
 
#endif // SILICON_EVENT_HPP