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/////////////////////////////////////////////////////////////////////////////
// Name: sharedptr.h
// Purpose: interface of wxSharedPtr<T>
// Author: wxWidgets team
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/**
A smart pointer with non-intrusive reference counting.
It is modelled after @c boost::shared_ptr<> and can be used with STL
containers and wxVector<T> unlike @c std::auto_ptr<> and wxScopedPtr<T>.
@library{wxbase}
@category{smartpointers}
@see wxScopedPtr<T>, wxWeakRef<T>, wxObjectDataPtr<T>
*/
template<typename T>
class wxSharedPtr<T>
{
public:
/**
Constructor.
Creates shared pointer from the raw pointer @a ptr and takes ownership
of it.
*/
wxEXPLICIT wxSharedPtr(T* ptr = NULL);
/**
Constructor.
Creates shared pointer from the raw pointer @a ptr and deleter @a d
and takes ownership of it.
@param ptr The raw pointer.
@param d Deleter - a functor that is called instead of delete to
free the @a ptr raw pointer when its reference count drops to
zero.
@since 3.0
*/
template<typename Deleter>
wxEXPLICIT wxSharedPtr(T* ptr, Deleter d);
/**
Copy constructor.
*/
wxSharedPtr(const wxSharedPtr<T>& tocopy);
/**
Destructor.
*/
~wxSharedPtr();
/**
Returns pointer to its object or @NULL.
*/
T* get() const;
/**
Conversion to a boolean expression (in a variant which is not
convertible to anything but a boolean expression).
If this class contains a valid pointer it will return @true, if it contains
a @NULL pointer it will return @false.
*/
operator unspecified_bool_type() const;
/**
Returns a reference to the object.
If the internal pointer is @NULL this method will cause an assert in debug mode.
*/
T operator*() const;
/**
Smart pointer member access. Returns pointer to its object.
If the internal pointer is @NULL this method will cause an assert in debug mode.
*/
T* operator->() const;
/**
Assignment operator.
Releases any previously held pointer and creates a reference to @a ptr.
*/
wxSharedPtr<T>& operator=(T* ptr);
/**
Assignment operator.
Releases any previously held pointer and creates a reference to the
same object as @a topcopy.
*/
wxSharedPtr<T>& operator=(const wxSharedPtr<T>& tocopy);
/**
Reset pointer to @a ptr.
If the reference count of the previously owned pointer was 1 it will be deleted.
*/
void reset(T* ptr = NULL);
/**
Reset pointer to @a ptr.
If the reference count of the previously owned pointer was 1 it will be deleted.
@param ptr The new raw pointer.
@param d Deleter - a functor that is called instead of delete to
free the @a ptr raw pointer when its reference count drops to
zero.
@since 3.0
*/
template<typename Deleter>
void reset(T* ptr, Deleter d);
/**
Returns @true if this is the only pointer pointing to its object.
*/
bool unique() const;
/**
Returns the number of pointers pointing to its object.
*/
long use_count() const;
};
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