On Wed, 10 Dec 2014 17:04:42 -0500 Uri Guttman <u...@stemsystems.com> wrote:
> it is called magic goto for that reason. it isn't really a sub call > but a replacement of the current sub with the called one. no stack > work is done and @_ is passed as is. it is very valuable when used > like that but rarely needed. when you see newbies making calls like > foo; and not know why that is dangerous, you have to teach them about > it. It's based on the idea of continuations, for those you want to know the theory behind it. A continuation is passing a code reference to a sub for it to "return" to rather than using the call stack. It works well with exceptions: the first parameter to every sub is the normal execution and the second is the exception handler. (The rest of the parameters would be the regular parameters of the sub call.) https://en.wikipedia.org/wiki/Continuation -- Don't stop where the ink does. Shawn -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
