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  2. RPG400-L
  3. November 2003

Re: Infinit loop in /free

Booth Martin wrote:

... Besides that, why have a never ending loop? I thought goto, leave, iter,
CAS**, and CAB** were all opcodes that had been disgraced and sent into
exile?

Ah, it must be friday! ;-)

First, disregarding such pedantries that there's really no such thing as a never ending loop, lots of applications are driven by a loop without any explicitly coded form of termination, and end when the operators decide to cancel them. For example, many IP servers are driven by a loop that waits on incoming requests and spins off threads to service the requests.

Second, while most recommend avoiding GOTO, CASxx, and CABxx for new code, there's absolutely nothing wrong with LEAVE and ITER. Even if you subscribe to the tenets of "structured programming", when using LEAVE or ITER, your loop still has a single entry and a single exit. By explicitly exiting a construct early, you can often avoid additional levels of nesting.

Cheers! Hans



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