This still makes you put the execution as a macro argument, but the benefit comes from the fact that most of the time a loop can just go from 0 to a given numbe

This still makes you put the execution as a macro argument, but the benefit comes from the fact that most of the time a loop can just go from 0 to a given number. If just the for loop is in the macro you can put the braces in yourself. If the braces are up to you, nested loops are cleaner. DO(y,height) DO(x, width) blur(x,y);