Return from within a procedure

Posted by scosens on 14-Aug-2017 10:00

Hi,

This may be a simple question, but is it possible to 'return' from within a procedure to the calling program.  So ProgramA runs ProgramB which runs ProcedureC.  I want to return directly from ProcedureC directly to ProgramA.

Alternatively is it possible to trigger a block of code when returning?   Some sort of "on Return do....." I've got multiple times in my program where I'm 'Return'-ing from ProgramB to ProgramA, because of some failed validation etc, and want to make it do some tidying up when it returns, but without hard coding that every time.

Thanks,

SC

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Posted by Mike Fechner on 14-Aug-2017 11:04

For tidiyng up, you should have a look at finally blocks. To return a status from procedure C to B, use output parameters. For returning error states, undo, throw new AppError ("some return value").

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scosens

Hi,

This may be a simple question, but is it possible to 'return' from within a procedure to the calling program.  So ProgramA runs ProgramB which runs ProcedureC.  I want to return directly from ProcedureC directly to ProgramA.

Alternatively is it possible to trigger a block of code when returning?   Some sort of "on Return do....." I've got multiple times in my program where I'm 'Return'-ing from ProgramB to ProgramA, because of some failed validation etc, and want to make it do some tidying up when it returns, but without hard coding that every time.

Thanks,

SC

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Posted by Peter Judge on 14-Aug-2017 11:10

There’s no simple way to do what you want. Throwing errors - or rather, having them propogate their way up the stack – is a common way to do what you want.  Make sure you have BLOCK-LEVEL or ROUTINE-LEVEL directives everywhere when you do this.
 
The FINALLY block can help with cleanup etc. It’s pretty much always going to run  and is good for deleting handles, clearing memptrs and other similar stuff.

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