One
template <class T> class One : private MoveableAndDeepCopyOption< One<T> >
T Type or base class of element stored in One.
One is a container capable of containing none or single element of type specified as template argument or derived from it.
One is moveable type with pick and optional deep copy transfer semantics. Calling methods of picked One is logic error with exception of
void operator=(pick_ One& v)
void operator<<=(const One& v) (defined using DeepCopyOption template base class)
void Clear()
bool IsPicked() const
Members
One()
Constructor. Constructs empty One.
One(T *newt)
Constructs One with content. Content is specified by pointer to object created using operator new. One takes over ownership of this this object.
One(pick_ One<T>& p)
Pick constructor. Transfers source One in low constant time, but destroys it by picking.
One(const One<T>& p, int)
Optional deep copy constructor.
Requires T to have deep copy constructor or optional deep copy constructor.
~One()
Destructor.
void Attach(T *data)
Assigns element to One. (Note: if there is content in One while calling this function, it is destroyed).
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data |
Pointer to the new element created using operator new. |
T *Detach() pick_
Removes content giving up ownership. Client is responsible for deletion of content.
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Return value |
Pointer to the content allocated on the heap. |
T *operator-() pick_
Same as Detach() (operator version).
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Return value |
Pointer to the content allocated on the heap. |
void Clear()
Removes and destroys content.
void operator=(T *data)
Same as Attach(data) (operator version).
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data |
Pointer to the new element created using operator new. |
void operator=(pick_ One<T>& d)
Pick operator. Transfers source One in low constant time, but destroys it by picking.
const T *operator->() const
Constant content access operator. Illegal if there is no content.
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Return value |
Returns constant pointer to content. |
T *operator->()
Content access operator. Illegal if there is no content.
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Return value |
Returns pointer to content. |
const T *operator~() const
Constant content pointer access.
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Return value |
Returns constant pointer to content or NULL when there is no content. |
T *operator~()
Content pointer access.
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Return value |
Returns pointer to content or NULL when there is no content. |
const T& operator*() const
Content constant reference access. Illegal if there is no content.
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Return value |
Constant reference to content. |
T& operator*()
Content reference access. Illegal if there is no content.
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Return value |
Reference to content. |
template <class TT> TT& Create()
Creates content in One. (Note: if there is content in One while calling this function, it is destroyed).
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TT |
Type of content. Must be equal to T or derived from it. |
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Return value |
Reference to actual content (of type TT). |
bool IsPicked() const
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Return value |
true if One is picked. |
bool IsEmpty() const
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Return value |
true if there is no content. |
operator bool() const
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Return value |
true if there is content. |
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