44 lines
1.1 KiB
C++
44 lines
1.1 KiB
C++
#pragma once
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#include <typeinfo>
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#include "nf7.hh"
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namespace nf7 {
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template <typename Base, typename... I>
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struct PtrSelector final {
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public:
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PtrSelector(const std::type_info& t) noexcept : type_(&t) { }
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PtrSelector(const PtrSelector&) = delete;
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PtrSelector(PtrSelector&&) = delete;
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PtrSelector& operator=(const PtrSelector&) = delete;
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PtrSelector& operator=(PtrSelector&&) = delete;
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template <typename T1, typename... T2>
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Base* Select(T1 ptr1, T2... ptr2) noexcept {
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auto ptr = Get<T1, I...>(ptr1);
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return ptr? ptr: Select(ptr2...);
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}
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Base* Select() noexcept { return nullptr; }
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private:
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template <typename T, typename I1, typename... I2>
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Base* Get(T ptr) const noexcept {
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if constexpr (std::is_base_of<I1, std::remove_pointer_t<T>>::value) {
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if (*type_ == typeid(I1)) return static_cast<I1*>(ptr);
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}
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return Get<T, I2...>(ptr);
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}
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template <typename T>
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Base* Get(T) const noexcept { return nullptr; }
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const std::type_info* const type_;
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};
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template <typename... I>
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using InterfaceSelector = PtrSelector<File::Interface, I...>;
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} // namespace nf7
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