[Gambas-user] Optional parameters for Read accessors

[Benoît Minisini]

Le 21/06/2021 à 04:08, bb a écrit :
> I'm pushing the boundaries again.
> 
> Sometimes we have a property that has more than one state variable. An
> easy example is one where its original value or "at some point" is set
> by the property Write accessor and its current state variable value is
> variable perhaps based on user activity.
> 
> What I am trying to achieve is a way to have the property Read accessor
> accept on optional parameter that will determine which of those values
> is returned.
> 
> Of course, the obvious answer is to use another property or function to
> return a specific state variable.
> 
> However it would be "neater" to have this in the natural accessor
> method.
>    Private Sub MyProp_Read(Optional orig As Boolean=False) as Integer
>      If orig then
>        Return $originalValue
>      Else
>        Return $currentValue
>      EndIf
>    End
> or something like that. In my current case the situation is much more
> complex, hence the question, but that example encapsulates what I am
> trying to achieve.
> 
> At the moment, trying this results in a "_Read declaration does not
> match" error from the compiler, naturally.
> 
> Is this viable?
> Thoughts?
> 
> regards
> bruce
> 

Then you have to replace your "MyProp" property by a "GetMyProp" 
function with your optional parameter, like you would do in Java.

Regards,

-- 
Benoît Minisini