Not really. There are many ways depending on your needs. For example, you can partition your space first, then generate randomly inside each of the subspaces. Let's say I need 200 numbers from -1000 to 999. The first range will be 0 to +99, the second -1 to -100, then +100 to +199, and so on. So, to generate a random number I just need an index and the bounds.