Re: Smart Pointer problem

ppi <>
Fri, 27 Jun 2008 14:28:00 CST

We have our smart pointer implementation. But the operator -> is
creating problem in case of a const pointer. It's always returning a
non-const pointer, therefore, we are able to call a non const function
on a const pointer. How can we overcome this problem?
Smart pointer code.

const is part of the function signature in C++, hence you can write
your methods as:

T* operator->()
         return m_p;

const T *operator->() const
         return m_p;

if a const smartPointer is used a const pointer will be returned,
otherwise a regular pointer is used.
I used your code as follow:

template< class T

struct CSmartPointer
     CSmartPointer( T* loop ) : m_p( loop ){}
      * Returns the raw pointer for use in calling member functions.
     T* operator->()
         return m_p;

     const T *operator->() const
         return m_p;

     T* m_p;

class Test {
     void ChangeData(int a, int b)
         X = a;
         Y = b;
     int sum() const
         return X+Y;
     int X;
     int Y;

typedef CSmartPointer<Test> TestPtr;

void TestData(const TestPtr& test)
     TestPtr tmp( 0 ); // core ahead if run
     int x= 0;
     int y= 0;
     tmp->ChangeData(x, y);
     test->ChangeData(x, y);

Is that what you want to achieve ?

-- paulo

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