BestPractices: To raise, or not to raise ... an Exception in a class constructor

[Rollo62 536]

10 hours ago, Lars Fosdal said:

Sliding into off-topic, but I avoid parameters to constructors.

... and there we are again with Uwe's Initialize and my Conf_Setup_ scheme  ...

I like that approach too, because of the clear separation, but its hard to say where I should use that or better constructor parameters.

Maybe the experienced developer has always the right answer, but not me, I usually try and rework my classes many many times,

until I find a stable, acceptable final design.

Would be great to have some rules in what situations such separation makes sense, you gave already a good hint to that.

 

I like to use the Conf_Setup scheme in combination with the fluent interface, which makes class creation, or class builder, more nice and well readable.

begin
    LMyObj := TMyObj.Create
    {} .Conf_Setup_Begin
    {} .Conf_Setup_Color(  clBlue      )
    {} .Conf_Setup_Events( EvOnChange  )
     ...
    {} .Conf_Setup_End
    {} ;
    

end;

Most of the time I use class functions in those "Builders", which encapsulates class creation within the class itself.

Another step of separation creation and initialization within the "Builder".

 

 

 

[Attila Kovacs 629]

What is the problem with conventional coding? Why the ascii art and why not use some properties and a normal try finally?

 

 

[Anders Melander 1784]

3 hours ago, Attila Kovacs said:

What is the problem with conventional coding?

It's not "clever".

If real problems gets too hard to solve just invent some easy ones.