Function Overloading for the standard library functions in C++

Question

I have a free function as part of a class. In the constructor for the class i am doing some malloc operations . So in the destructor i am trying to free that memory. But VS10 compiler complains that the

free(pointer);

doesn't match the signature of the free function of my class.

So question is In a class wherein if we have implemented methods which have same names as that of standard library functions . How to call one over the other.

Regards,

You might want to post the your free function's signature. — André Caron
– André Caron, Commented Feb 3, 2012 at 8:29
1. You should be using new/delete. 2. The code might be useful at this end to comment further. — Ed Heal
– Ed Heal, Commented Feb 3, 2012 at 8:29

Some programmer dude · Accepted Answer · 2012-02-03 08:31:15Z

8

You have to use the scope operator to get the correct scope of the free function:

::free(pointer);

Having :: at the beginning tells the compiler to look for the free function at the global scope, not the closest scope which is your class.

answered Feb 3, 2012 at 8:31

Some programmer dude

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Comments

Mat · Accepted Answer · 2012-02-03 08:31:53Z

5

You should qualify your call to the function:

void YourClass::free(args) {
  ::free(your_member);
}

This will pick up the free function in the global namespace and not in your class.

#include <cstdio> also puts free and malloc into the std namespace, so std::free and std::malloc will also work.

(Use of new/delete should also be considered, as well as smart pointers.)

answered Feb 3, 2012 at 8:31

Mat

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