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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,6 +1,4 @@ | ||
| #pragma once | ||
| #include <memory> | ||
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| #include "../macros.hpp" | ||
| class CWorkspace; | ||
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| typedef std::shared_ptr<CWorkspace> PHLWORKSPACE; | ||
| typedef SP<CWorkspace> PHLWORKSPACE; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| #pragma once | ||
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| #include <typeinfo> | ||
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| namespace CSharedPointer_ { | ||
| struct impl { | ||
| /* strong refcount */ | ||
| unsigned int ref = 0; | ||
| /* weak refcount */ | ||
| unsigned int weak = 0; | ||
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| /* the actual stored data */ | ||
| void* data = nullptr; | ||
| /* if the destructor was called, | ||
| creating shared_ptrs is no longer valid */ | ||
| bool destroying = false; | ||
| }; | ||
| }; | ||
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| template <typename T> | ||
| class CSharedPointer { | ||
| public: | ||
| template <typename X> | ||
| using validHierarchy = typename std::enable_if<std::is_assignable<T*, X*>::value>; | ||
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| /* creates a new shared pointer managing a resource | ||
| avoid calling. Could duplicate ownership. Prefer makeShared */ | ||
| explicit CSharedPointer(T* object) { | ||
| impl_ = new CSharedPointer_::impl(); | ||
| impl_->data = object; | ||
| increment(); | ||
| } | ||
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| /* creates a shared pointer from a reference */ | ||
| template <typename U, typename = validHierarchy<U>> | ||
| explicit CSharedPointer(const CSharedPointer<U>& ref) { | ||
| impl_ = ref.impl_; | ||
| increment(); | ||
| } | ||
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| /* allows weakPointer to create from an impl */ | ||
| explicit CSharedPointer(CSharedPointer_::impl* implementation) { | ||
| impl_ = implementation; | ||
| increment(); | ||
| } | ||
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| /* creates an empty shared pointer with no implementation */ | ||
| CSharedPointer() { | ||
| ; // empty | ||
| } | ||
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| /* creates an empty shared pointer with no implementation */ | ||
| CSharedPointer(std::nullptr_t) { | ||
| ; // empty | ||
| } | ||
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| ~CSharedPointer() { | ||
| // we do not decrement here, | ||
| // because we want to preserve the pointer | ||
| // in case this is the last owner. | ||
| if (impl_ && impl_->ref == 1) | ||
| destroyImpl(); | ||
| else | ||
| decrement(); | ||
| } | ||
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| template <typename U, typename = validHierarchy<U>> | ||
| CSharedPointer<T>& operator=(const CSharedPointer<U>& rhs) { | ||
| if (impl_ == rhs.impl_) | ||
| return *this; | ||
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| decrement(); | ||
| impl_ = rhs.impl_; | ||
| increment(); | ||
| } | ||
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| operator bool() const { | ||
| return impl_ && impl_->data; | ||
| } | ||
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| bool operator==(const CSharedPointer& rhs) const { | ||
| return impl_ == rhs.impl_; | ||
| } | ||
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| T* operator->() const { | ||
| return get(); | ||
| } | ||
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| T& operator*() const { | ||
| return *get(); | ||
| } | ||
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| void reset() { | ||
| decrement(); | ||
| impl_ = nullptr; | ||
| } | ||
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| T* get() const { | ||
| return (T*)(impl_ ? impl_->data : nullptr); | ||
| } | ||
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| unsigned int strongRef() const { | ||
| return impl_ ? impl_->ref : 0; | ||
| } | ||
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| CSharedPointer_::impl* impl_ = nullptr; | ||
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| private: | ||
| /* | ||
| no-op if there is no impl_ | ||
| may delete the stored object if ref == 0 | ||
| may delete and reset impl_ if ref == 0 and weak == 0 | ||
| */ | ||
| void decrement() { | ||
| if (!impl_) | ||
| return; | ||
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| impl_->ref--; | ||
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| // if ref == 0, we can destroy impl | ||
| if (impl_->ref == 0) | ||
| destroyImpl(); | ||
| } | ||
| /* no-op if there is no impl_ */ | ||
| void increment() { | ||
| if (!impl_) | ||
| return; | ||
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| impl_->ref++; | ||
| } | ||
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| /* destroy the pointed-to object | ||
| if able, will also destroy impl */ | ||
| void destroyImpl() { | ||
| // first, we destroy the data, but keep the pointer. | ||
| // this way, weak pointers will still be able to | ||
| // reference and use, but no longer create shared ones. | ||
| impl_->destroying = true; | ||
| delete (T*)impl_->data; | ||
| // now, we can reset the data and call it a day. | ||
| impl_->data = nullptr; | ||
| impl_->destroying = false; | ||
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| // check for weak refs, if zero, we can also delete impl_ | ||
| if (impl_->weak == 0) | ||
| delete impl_; | ||
| } | ||
| }; | ||
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| template <typename U, typename... Args> | ||
| static CSharedPointer<U> makeShared(Args&&... args) { | ||
| auto p = CSharedPointer<U>(new U(std::forward<Args>(args)...)); | ||
| return p; | ||
| } |
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