C++ idiom to avoid memory leaks?

Question

In the following code, there is a memory leak if Info::addPart1() is called multiple times by accident:

typedef struct
{
}part1;

typedef struct
{
}         


        

Answer 1

If you want it to have a lazy behavior you might consider this:

addPart1()
{
    if(_ptr1 == NULL) {
        _ptr1 = new part1;
    }
}

The way you suggested is also an alternative depending how you want it to behave. But other people have suggested better ways to do it, but as we really don't know why you made it this way and how the surrounding code works ...