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src/Engine/Component/Component.h

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+#pragma once
+#include <concepts>
+#include <tuple>
+
+namespace Seele
+{
+template<typename... Types>
+struct Dependencies;
+template<>
+struct Dependencies<>
+{};
+template<typename This, typename... Rest>
+struct Dependencies<This, Rest...> : public Dependencies<Rest...>
+{
+    template<typename... Right>
+    Dependencies<This, Rest..., Right...> operator|(const Dependencies<Right...>& other)
+    {
+        return Dependencies<This, Rest..., Right...>();
+    }
+};
+
+namespace Component
+{
+#pragma warning(disable: 4505)
+template<typename Comp>
+static int accessComponent(Comp& comp);
+}
+
+template<typename T, typename... Deps>
+concept is_component = std::same_as<decltype(T::dependencies), Dependencies<Deps...>>;
+
+#define REQUIRE_COMPONENT(x) \
+    private: \
+    x& get##x() { return *tl_##x; } \
+    const x& get##x() const { return *tl_##x; }; \
+    public: \
+    static Dependencies<x> dependencies;
+
+#define DECLARE_COMPONENT(x) \
+    thread_local extern x* tl_##x; \
+    template<> \
+    int accessComponent<x>(x& val) { tl_##x = &val; return 0; }
+
+#define DEFINE_COMPONENT(x) \
+    thread_local x* Seele::Component::tl_##x;
+
+} // namespace Seele