Event.h

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#pragma once
#include "common/Setup.h"
#include <functional>
#include <unordered_map>
 
namespace mana
{
    using EventNameType = uint32_t;
    static constexpr EventNameType EventInvalidName = 0;
 
    template <typename... Arguments>
    class Event : Noncopyable
    {
    public:
        using FunctionType = void(Arguments...);
 
    public:
        Event() = default;
        virtual ~Event() = default;
 
        [[nodiscard]] EventNameType Add(const std::function<FunctionType>& function)
        {
            static EventNameType index = 1;
            mFunction[index] = function;
            return index++;
        }
 
        void Remove(const EventNameType name)
        {
            mFunction.erase(name);
        }
 
        [[nodiscard]] bool Contain(const EventNameType name) const
        {
            return mFunction.contain(name);
        }
 
        void Broadcast(Arguments... arguments) const
        {
            for (const auto& function : mFunction)
            {
                function.second(arguments...);
            }
        }
 
    private:
        std::unordered_map<EventNameType, std::function<FunctionType>> mFunction;
    };
}