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76 lines
1.5 KiB
76 lines
1.5 KiB
#ifndef qwt3d_autoptr_h__2004_05_14_18_57_begin_guarded_code
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#define qwt3d_autoptr_h__2004_05_14_18_57_begin_guarded_code
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namespace Qwt3D
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{
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//! Simple Auto pointer providing deep copies for raw pointer
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/*!
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Requirements: \n
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virtual T* T::clone() const;\n
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T::destroy() const;
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virtual ~T() private/protected\n\n
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clone() is necessary for the pointer to preserve polymorphic behaviour.
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The pointer requires also heap based objects with regard to the template
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argument in order to be able to get ownership and control over destruction.
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*/
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template <typename T>
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class qwt3d_ptr
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{
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public:
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//! Standard ctor
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explicit qwt3d_ptr(T* ptr = 0)
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:rawptr_(ptr)
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{
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}
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//! Dtor (calls T::destroy)
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~qwt3d_ptr()
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{
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destroyRawPtr();
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}
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//! Copy ctor (calls (virtual) clone())
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qwt3d_ptr(qwt3d_ptr const& val)
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{
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rawptr_ = val.rawptr_->clone();
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}
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//! Assignment in the same spirit as copy ctor
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qwt3d_ptr<T>& operator=(qwt3d_ptr const& val)
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{
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if (this == &val)
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return *this;
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destroyRawPtr();
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rawptr_ = val.rawptr_->clone();
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return *this;
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}
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//! It's a pointerlike object, isn't it ?
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T* operator->() const
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{
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return rawptr_;
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}
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//! Dereferencing
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T& operator*() const
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{
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return *rawptr_;
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}
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private:
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T* rawptr_;
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void destroyRawPtr()
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{
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if (rawptr_)
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rawptr_->destroy();
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rawptr_ = 0;
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}
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};
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} // ns
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#endif /* include guarded */
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