Question

Suppose I have two different structures, Struct1 and Struct2. They both have different elements in them.
What happens if I compare them like this:

if((Struct1) && (Struct2))
{
    doSomething();
}

I just found some code with this logic and was wondering what was happening.
Thanks!

EDIT: Struct1 and Struct2 are both pointers to two different structures, not structures themselves.

Answer 1

For that to work, you must have pointers, not structures. That is, the code might be:

void somefunc(struct structA *Struct1, struct structB *Struct2)
{
    if (Struct1 && Struct2)
    {
        doSomething(Struct1, Struct2);
    }
}

This checks that neither of the pointers is NULL before using them. You cannot compare structures directly, so if the code were:

void somefunc(struct structA Struct1, struct structB Struct2)
{
    if (Struct1 && Struct2)
    {
        doSomething(Struct1, Struct2);
    }
}

you would have a semantic error; you simply cannot compare whole structures with anything.

The capitalization of the variables is aconventional.