ecs_utils.hpp

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#pragma once 
 
#include <concepts>
#include <functional>
#include <tuple>
#include "ecs_CONSTANTS.hpp"
 
namespace ecs
{
    template <typename I>
    concept ValidEntity = std::integral<I> && std::unsigned_integral<I>;
 
    template <typename T, typename... Ts>
    concept is_any = std::disjunction_v<std::is_same<T, Ts>...>;
 
    template <typename... Args>
    struct IndexOf
    {
        template <typename T> requires is_any<T, Args...>
        static size_t get()
        {
            static size_t local_index = index++;
 
            return local_index;
        }
    private:
        static size_t index;
    };
 
    template <typename... Args>
    size_t IndexOf<Args...>::index = 0;
}