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52 lines
1.8 KiB
52 lines
1.8 KiB
#pragma once
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#include <cow.hpp>
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#include <utility>
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template<typename T>
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struct TypedCow : private Cow, public _cow_util::Span<T> {
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struct Fake;
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friend class Fake;
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TypedCow() = delete;
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inline TypedCow(TypedCow<T>&& move) : Cow(std::move(move.super)) { /* Moves the shared_ptr. No need to move the elements. */ }
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// protected: copy
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inline TypedCow(size_t sz) : Cow(sz * sizeof(T)) { init_copy(T()); }
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inline TypedCow(size_t sz, const T& copy_from) : TypedCow(sz) { init_copy(copy_from); }
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template<typename... Args>
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inline TypedCow(size_t sz, Args&&... args) : TypedCow(sz) { init_copy( T(std::forward<Args>(args)...) ); }
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inline ~TypedCow() { uninit(); }
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inline void* area() { return Cow::area(); }
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inline const void* area() const { return Cow::area(); }
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inline size_t size() const override { return Cow::size() / sizeof(T); }
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inline T& operator[](size_t i) { if (i>=size()) throw "idx"; else return *reinterpret_cast<T*>(this->as_bytes() + (sizeof(T) * i)); }
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inline const T& operator[](size_t i) const { if (i>=size()) throw "idx"; else return *reinterpret_cast<const T*>(this->as_bytes() + (sizeof(T) * i)); }
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protected:
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// Should only be used for creating Fakes. Copies the refcounted pointer.
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inline TypedCow(const TypedCow<T>& copy) : Cow(copy.super) {}
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// UNSAFE: Placement-new's copys of `copy_from` into `0..size()` of this instance.
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inline void init_copy(const T& copy_from) {
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unsigned char* bytes = this->as_bytes();
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for(size_t i=0;i<size();i++)
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new ((void*)(bytes + (sizeof(T)*i))) T(copy_from);
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}
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// UNSAFE: Explicitly calls destructors of each element in this instance.
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inline void uninit() {
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unsigned char* bytes = this->as_bytes();
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for(size_t i=0;i<size();i++)
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reinterpret_cast<T*>(bytes + (sizeof(T)*i))->~T();
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}
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};
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template<typename T>
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struct TypedCow<T>::Fake : private Cow::Fake, public _cow_util::Span<T> {
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};
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