No, vector() returns a temporary vector, which means, it cycles through 64 pre-created vectors and returns a pointer to one of them (round robin style)

so if you remove a vector, you will most likely get a crash, but even if not, you won't get predictable behaviour and bugs one cannot comprehend

the function most likely looks something like this:

Code:
VECTOR storage[64];
int index = 0;

VECTOR * vector(var x, var y, var z)
{
    VECTOR * vec = &storage[index];
    index += 1;
    if(index >= 64)
        index = 0;
    vec->x = x;
    vec->y = y;
    vec->z = z;
    return vec;
}

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