---

CTBclone Class Template Reference

Function object for the `clone or copy' paradigma. More...

#include <CTBclone.hxx>

List of all members.

Public Methods
T *	operator() (const T &src) const

---

Detailed Description

template<class T>
class CTBclone< T >

Function object for the `clone or copy' paradigma.

Often the need arises to duplicate an object. In many cases a simple copy construct is sufficient. However, this is not possible if the object is for example only known through a pointer to a base class. In those cases the object can't be copied but must be cloned.

In templatized classes one faces the problem to use depending on the type of the object either the copy or the clone approach, the former for simple classes which don't have a clone method, the later for example for abstract base classes.

The classes CTBclone and a helper class CTBcloneable provide a function object interface for such a `clone or copy' functionality:

• The class CTBclone provides the interface. The operator()() returns a new'ed copy or clone of the object passed as first argument.
• The actual implementation of CTBclone uses copy semantics and provides the default for all simple classes.
• The helper class CTBcloneable has the same interface as CTBclone , its implementation uses clone semantics and expects a Clone() method to exists.
• To get clone rather copy semantics for a type T one has to overwrite the definition of CTBclone<T> by providing a specialization of CTBclone. If T has a Clone() method this can simply be done by deriving a specialization of CTBclone from CTBcloneable like

     class foo {
       public:
         foo*     Clone() const;
       ...
     };
  
     class CTBclone<foo> : public CTBcloneable<foo> {};

  In other cases one has to define a specialization of CTBclone with the same interface and give an implemenation with whatever the class provides for cloning.

  Note, that the specialization of CTBclone has to be declared in all derived classes, it is not sufficient to do this just for the base class.

Requirements:

• T(const T&)

Definition at line 17 of file CTBclone.hxx.

---

Member Function Documentation

template<class T> T * CTBclone< T >::operator() (  const T & src )  const [inline]

Create a new object of type T as a copy of src. Definition at line 68 of file CTBclone.icc.

---

The documentation for this class was generated from the following files:

• CTBclone.hxx
• CTBclone.icc

---