Hello. I'm quite new to smart pointers and was trying to refactor some existing code to use auto_ptr. The question I have is about double pointers and their auto_ptr equivalent, if that makes sense.

I have a function that accepts a double pointer as its parameter and the function allocates resources for it:

void foo ( Image** img ) { ... *img = new Image(); ...}

This function is then used like this:

Image* img = NULL;
foo ( &img );
...
delete img;

I want to use auto_ptr to avoid having to call delete explicitly. Is the following correct?

void foo ( auto_ptr<Image>* img );

and then

auto_ptr<Image> img = NULL;
foo ( &img );

Thanks.