43 lines
2.5 KiB
C++
43 lines
2.5 KiB
C++
#pragma once
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#include <concepts>
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#include <tuple>
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namespace Seele {
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template <typename... Types> struct Dependencies;
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template <> struct Dependencies<> {
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int x;
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template <typename... Right> Dependencies<Right...> operator|(const Dependencies<Right...>&) { return Dependencies<Right...>(); }
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};
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template <typename This, typename... Rest> struct Dependencies<This, Rest...> : public Dependencies<Rest...> {
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template <typename... Right> Dependencies<This, Rest..., Right...> operator|(const Dependencies<Right...>&) {
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return Dependencies<This, Rest..., Right...>();
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}
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int x;
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};
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namespace Component {
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template <typename Comp> Comp& getComponent();
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}
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template <typename Comp>
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concept has_dependencies = requires(Comp) { Comp::dependencies; };
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#define REQUIRE_COMPONENT(x) \
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private: \
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x& get##x() { return getComponent<x>(); } \
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const x& get##x() const { return getComponent<x>(); } \
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\
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public: \
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constexpr static Dependencies<x> dependencies = {};
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#define DECLARE_COMPONENT(x) \
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void accessComponent(x& val); \
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template <> x& getComponent<x>();
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#define DEFINE_COMPONENT(x) \
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thread_local x* tl_##x = nullptr; \
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void Seele::Component::accessComponent(x& ref) { tl_##x = &ref; } \
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template <> x& Seele::Component::getComponent<x>() { return *tl_##x; }
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} // namespace Seele
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