Concept definition

template<typename T, typename TSceneId, typename TInput>
concept rtk::Scene = 
    SceneIdentifier<TSceneId> &&
    requires(T &scene, EngineContext &context, const TInput &input, float dt) {
      { T::Type } -> std::convertible_to<TSceneId>;
      { scene.onEnter(context) } -> std::same_as<void>;
      {
        scene.onUpdate(context, input, dt)
      } -> std::same_as<std::optional<TSceneId>>;
      { scene.onExit(context) } -> std::same_as<void>;
    }

Detailed Description

Requirements for a scene managed by rtk::SceneManager.

A valid scene has a static Type identifier and the onEnter(), onUpdate() and onExit() methods. onUpdate() returns the identifier of the next scene, or std::nullopt to stay on the current one.

Template Parameters

T	Concrete scene type being validated.
TSceneId	Type used to identify scenes, usually an enum.
TInput	Type containing the input state passed to the scene.

static_assert(rtk::Scene<MenuScene, SceneType, rtk::InputState>);