[PyKDE] SmartPointer support

[mail at fkollmann.de]

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Hello there,

due the continous discussion about smart pointers I want to make an approach how an implementation might look like. The main point is that we do not want to have a smart pointer object at all in Python because it is not necessary - Python always uses smart pointer in some POV.

Of course this would require some new language features. Okay, generelly we have a class with two functions. One returning a smart pointer reference and the other simply a pointer:

%Import MySmartPointer.sip

class Test
{
public:
    MyClass* GetSmartPointer() /SmartPointerReturned=MySmartPointer/;
    MyClass* GetNoSmartPointer();
};

The same for function parameters:

%Import MySmartPointer.sip

class Test2
{
public:
    void SetSmartPointer (MyClass* /SmartPointer=MySmartPointer/);
    void SetNoSmartPointer (MyClass*);
};

And variables:

%Import MySmartPointer.sip

class Test3
{
public:
    MyClass* smartPtr /SmartPointer=MySmartPointer/;
};

It might be usefull to be able to specify a default for modules (may be overwritten at any time):

%Import MySmartPointer.sip
%DefaultSmartPointer MySmartPointer

class Test
{
public:
    MyClass* GetSmartPointer() /SmartPointerReturned/;
    MyClass* GetNoSmartPointer();
};

class Test2
{
public:
    void SetSmartPointer (MyClass* /SmartPointer/);
    void SetNoSmartPointer (MyClass*);
};

class Test3
{
public:
     MyClass* smartPtr /SmartPointer/;
};

Finally it is required to define a smart pointer:

%SmartPointer MySmartPointer
{
%CreateRefCode    // optional; this is the default
    /* arguments:
        MySmartPointer* sipCppPtr
        type = /in this case/ MyClass
        MyClass* sipInnerPtr
    */

   sipCppPtr = new MySmartCppPointer<type> (sipInnerPtr);
%End

%GetInnerRefCode    // optional; this is the default
    /* arguments:
        MySmartPointer& sipCppRef
        MyClass* sipInnerPtr
    */

    sipInnerPtr = &*sipCppRef;
%End

%IncRefCode        // required
    /* arguments:
        MySmartPointer& sipCppRef
    */

    sipCppRef->AddRef();
%End

%DecRefCode        // required
    /* arguments:
        MySmartPointer& sipCppRef
    */

    sipCppRef->Release();
%End
};

What do you think of it? cu Felix
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