Passing dynamic arrays

[Jesse Phillips]

Jens Mueller Wrote:

> I like that explanation. Jonathan is saying the same, I think.

Yes, same thing.

> In C++ you cannot change a reference (I hope I'm right
> here.). When using a std::vector one does not need to think about this.

Don't know too much about C++ references, but as mentioned somewhere you can use the Array container which won't have this issue

> What's the general use of a = new A() in the above code? Where is it
> useful?
> 
> Jens

I don't really have any good use-case examples. Maybe an initialization function? Developed your own number object (big int) and were thinking in terms of it being a refrence you thought 

a = a + BigInt(7);

would result in a being resigned in the calling function. Or maybe just a function that swaps two class references:

void swap(T)(T a, T b) { // Correct void swap(T)(ref T a, ref T b) {
    auto tmp = a; a = b; b = tmp;
}

Actually that turned out to be a pretty good one.