Performance penalty for using ranges

[Joseph Rushton Wakeling]

On 25/08/13 20:07, Paul Jurczak wrote:
> What is the purpose of "immutable _;" above? Why not "i;"?

It's never used, so notating it like this means you'll never clash with another 
variable name by accident (e.g. if somewhere else in the function you declare an 
int i).

Had never thought of that before but it's a handy trick, I'll have to make use 
of it in my own code ...