60 lines
1.4 KiB
C++
60 lines
1.4 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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{
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template<typename... Types>
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struct Dependencies;
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template<>
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struct Dependencies<>
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{
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int x;
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template<typename... Right>
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Dependencies<Right...> operator|(const Dependencies<Right...>& other)
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{
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return Dependencies<Right...>();
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}
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};
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template<typename This, typename... Rest>
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struct Dependencies<This, Rest...> : public Dependencies<Rest...>
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{
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template<typename... Right>
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Dependencies<This, Rest..., Right...> operator|(const Dependencies<Right...>& other)
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{
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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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{
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template<typename Comp>
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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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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<> \
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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<> \
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x& Seele::Component::getComponent<x>() { return *tl_##x; }
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} // namespace Seele
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