System.hpp

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#ifndef GALAXY_SYSTEMS_SYSTEM_HPP_
#define GALAXY_SYSTEMS_SYSTEM_HPP_
 
#include <concepts>
#include <string>
 
#include <entt/entity/registry.hpp>
 
namespace galaxy
{
    namespace systems
    {
        class System
        {
        public:
            virtual ~System() noexcept;
 
            virtual void update(entt::registry& registry) = 0;
 
            [[nodiscard]]
            const std::string& id() const noexcept;
 
        protected:
            System(const std::string& id) noexcept;
 
        private:
            System() = delete;
 
        protected:
            std::string m_id;
        };
        class System {…};
    } // namespace systems
 
    namespace meta
    {
        template<typename Type>
        concept is_system = std::derived_from<Type, systems::System>;
    } // namespace meta
} // namespace galaxy
 
#endif