传入和修改函数中的数组

Question

I have been looking at other posts and trying to get this working for a bit, but can't seem to manage it.

Basically I want to pass a "char myArray[10]" though into a function, have the function assign the values and then hand it back. It generally looks like this at the moment:

int MyClass::GetArray(char array[10])
{   
    char p[10];
    ... // a value is assigned to p
    memcpy(&array, &p, sizeof(p)); // Here array ends up being 0x3232323232323232 <Error reading characters of string.>

    return 0;
}

Called with:

    char array[10];
    myclass.GetArray(array);

So, I assume I need to pass the array through as a reference to the array[10] created before calling the function. But for that I am unsure how to create a pointer to a fixed array without making it either a general char* pointer or a pointer to an array of chars.

Secondly is the memcpy error (in the code comments above). I'm not sure if that is related or not though.

Answer 1

Then thing is that when you pass an array to a function, it decays to a pointer. So when you use the address-of operator & on array in the function, you're taking the address of the pointer, meaning you get a pointer to a pointer.

That, by the way, leads to undefined behavior .

Other than that it's all okay, you don't have to pass the array (or rather, pointer) by reference. It's just not very... C++-ish. :)