Casting byte[] to int/long

[Henrik]

Hello!

If I have a dynamic array of bytes, say

byte[] a; a = [1,2,3,4];

Is it possible to somehow cast a number of these bytes into an int or a long,
like so;

int b = cast(int)a[0..2];
long c = cast(long)a;

or something? The goal is to convert 2 * 8 bit into 1 * 16 bit or 4 * 8 bit
into 1 * 64 bit. 1) Is it possible? 2) Is it possible without confusing the
GC? 3) How? ;)