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122 lines
4.0 KiB
122 lines
4.0 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 : public _cow_util::Span<T> {
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struct Fake;
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template<typename... Args>
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inline TypedCow(size_t sz, Args&&... args) : real(Cow(sz * sizeof(T))) { init_copy( T(std::forward<Args>(args)...) ); }
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inline TypedCow(size_t sz, const T& copy) : real(Cow(sz * sizeof(T))) { init_copy(copy); }
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inline TypedCow(size_t sz) : TypedCow(sz, T()){}
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inline virtual ~TypedCow() { uninit(); }
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inline virtual Fake clone() const { return Fake(*this); }
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inline virtual cow_t* raw() const { return real.raw(); }
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inline size_t size() const { return real.size() / sizeof(T); }
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protected:
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//inline explicit TypedCow(const TypedCow<T>& unsafeCopy) : real(Cow(unsafeCopy.real)){}
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inline virtual void* area() override { return reinterpret_cast<void*>( real.ptr() ); }
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inline virtual const void* area() const override { return reinterpret_cast<const void*>( real.ptr() ); }
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inline void init_copy(const T& copy_from) {
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T* ptr = this->ptr();
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for(size_t i=0;i<size();i++)
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new ((void*)(ptr+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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T* ptr = this->ptr();
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if(!ptr) return;
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for(size_t i=0;i<size();i++)
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(ptr+i)->~T();
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}
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private:
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Cow real;
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};
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template<typename T>
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struct TypedCow<T>::Fake : public TypedCow<T> {
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//XXX: How THE FUCK do we initialise base's `real` here?????
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Fake() = delete;
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inline Fake(const Fake& copy) : fake(cow_clone(copy.fake)){}
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inline Fake(Fake&& move) : fake(move.fake) { *const_cast<cow_t**>(&move.fake) = nullptr; }
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inline Fake(const TypedCow<T>& clone) : fake(cow_clone(clone.raw())){}
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inline cow_t* raw() const override { return fake; }
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inline Fake clone() const override { return Fake(*this); }
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inline ~Fake(){}
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inline size_t size() const override { return fake ? cow_size(fake) : 0; }
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protected:
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inline void* area() override { return fake ? cow_ptr(fake) : nullptr; }
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inline const void* area() const override { return fake ? cow_ptr_of(const void, fake) : nullptr; }
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private:
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cow_t* const fake;
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};
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#if 0
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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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virtual inline ~TypedCow() { uninit(); }
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inline Cow::Fake clone() const override { return Cow::clone(); }
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inline Fake clone() const { return Fake(Cow::clone()); }
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inline size_t size() const override { return Cow::size() / sizeof(T); }
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protected:
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inline void* area() override { return Cow::area(); }
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inline const void* area() const override { return Cow::area(); }
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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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T* ptr = _cow_util::Span<T>::ptr();
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for(size_t i=0;i<size();i++)
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new ((void*)(ptr+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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T* ptr = _cow_util::Span<T>::ptr();
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for(size_t i=0;i<size();i++)
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(ptr+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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Fake() = delete;
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explicit inline Fake(Cow::Fake&& untyped) : Cow::Fake(untyped){}
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inline Fake(const Fake& copy) : Fake(copy.Cow::Fake::clone()){}
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inline Fake(Fake&& move) : Cow::Fake(std::move(move)) {}
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inline ~Fake(){}
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inline size_t size() const override { return Cow::Fake::size(); }
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protected:
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inline const void* area() const override { return Cow::Fake::area(); }
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inline void* area() override { return Cow::Fake::area(); }
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};
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#endif
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