[anonymoushn]

One example of a thing you want generics for is image processing procedures that operate on many different image formats with different color spaces. If you use the built-in image libraries (which is perhaps already a mistake), then you have an image that owns its channels, and you pass it to some resizing method or whatever, and then that resizing method's innermost loop chases pointers to find out which kind of image it was *for every pixel*. For performance reasons, you may not want to chase pointers in your innermost loop. Without generics, you need to copy and paste a bunch of code once per color space.