sc::Ref(3)

NAME
sc::Ref - A template class that maintains references counts.

SYNOPSIS

#include <ref.h>

Inherits sc::RefBase.

  Public Member Functions
Ref ()
Create a reference to a null object.
Ref (T *a)
Create a reference to the object a.
Ref (const Ref< T > &a)
Create a reference to the object referred to by a.
template<class A> Ref (const Ref< A > &a)
Create a reference to the object referred to by a.
~Ref ()
Delete this reference to the object.
T * operator-> () const
Returns the reference counted object.
T * pointer () const
Returns a pointer the reference counted object.
RefCount * parentpointer () const
Implements the parentpointer pure virtual in the base class.
operator T * () const
T & operator * () const
Returns a C++ reference to the reference counted object.
int null () const
Return 1 if this is a reference to a null object.
int nonnull () const
Return !null().
template<class A> int operator== (const Ref< A > &a) const
A variety of ordering and equivalence operators are provided using the Identity class.
template<class A> int operator>= (const Ref< A > &a) const
template<class A> int operator<= (const Ref< A > &a) const
template<class A> int operator> (const Ref< A > &a) const
template<class A> int operator< (const Ref< A > &a) const
template<class A> int operator!= (const Ref< A > &a) const
int compare (const Ref< T > &a) const
Compare two objects returning -1, 0, or 1.
void clear ()
Refer to the null object.
Ref< T > & operator= (const Ref< T > &c)
Assignment to c.
template<class A> Ref< T > & operator= (const Ref< A > &c)
Assignment to c.
Ref< T > & operator<< (const RefBase &a)
Assignment to the object that a references using dynamic_cast.
Ref< T > & operator<< (RefCount *a)
Assigns to the given base class pointer using dynamic_cast.
Ref< T > & operator= (T *cr)
Assignment to cr.
void assign_pointer (T *cr)
Assignment to cr.
void check_pointer () const
Check the validity of the pointer.
void ref_info (std::ostream &os) const
Print information about the reference to os.
void warn (const char *s) const
Print a warning concerning the reference.

Detailed Description

  template<class T> class sc::Ref< T >
A template class that maintains references counts. Several of these operations can cause a reference to an object to be replaced by a reference to a different object. If a reference to a nonnull object is eliminated, the object's reference count is decremented and the object is deleted if the reference count becomes zero.

There also may be a to convert to T*, where T is the type of the object which Ref references. Some compilers have bugs that prevent the use of operator T*(). The pointer() member should be used instead.

Constructor & Destructor Documentation

  template<class T> sc::Ref< T >::~Ref () [inline]

Delete this reference to the object.

Decrement the object's reference count and delete the object if the count is zero.

Member Function Documentation

  template<class T> T* sc::Ref< T >::operator-> () const [inline]

Returns the reference counted object.

The behaviour is undefined if the object is null.

  template<class T> T& sc::Ref< T >::operator * () const [inline]

Returns a C++ reference to the reference counted object.

The behaviour is undefined if the object is null.

  template<class T> int sc::Ref< T >::null () const [inline]

Return 1 if this is a reference to a null object.

Otherwise return 0.

  template<class T> template<class A> int sc::Ref< T >::operator== (const Ref< A > & a) const [inline]

A variety of ordering and equivalence operators are provided using the Identity class.

  template<class T> int sc::Ref< T >::compare (const Ref< T > & a) const [inline]

Compare two objects returning -1, 0, or 1.

Similar to the C library routine strcmp.

  template<class T> Ref<T>& sc::Ref< T >::operator<< (RefCount * a) [inline]

Assigns to the given base class pointer using dynamic_cast.

If the dynamic_cast fails and the argument is nonnull and has a reference count of zero, then it is deleted.

Reimplemented in sc::RefSCDimension.

Author

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