[fpc-pascal] Boolean case statement

[Terry Kemp]

On Tue, 2006-12-05 at 22:44 +0100, Vincent Snijders wrote:
> Terry Kemp schreef:
> > Hi All
> > 
> > how do you do a case statement on a record of booleans e.g...
> > 

> You cannot use it like that. You would have to use an nested if then 
> statement like:
> 
> if EngMode.ManualOp then ManualRun
> else if EngMode.ManualOp then LeakTest
> else etc.
> 
> 
> I would use an enum:
> 
> type
>    TEngMode = (emManualOp, emLeakTest, emDrainFlush);
> 
> var
>    EngMode : TEngMode;
> 
> case EngMode of
>    emManualOp: ManualRun;
>    emLeakTest: LeakTestRun;
>    emDrainFlush: DrainFlushTest;
> end;
> 
> if several EngMode can occur at the same time (like can happen with 
> EngModeRec) you can use
> 
> type
>    TEngModeSet = set of TEngMode;
> 
> But then you cannot use case anymore to do the tests.
> 
> HTH,
> Vincent

Hey! I like this enum method - the 'states' are to be mutually exclusive
so this works great.

thanks alot