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Re: The problem with 'Null' [message #20467 is a reply to message #20452]

Fri, 20 March 2009 08:16

gridem
Messages: 45
Registered: August 2008

Member

Thank you very much for detailed answers! It's very useful for me to understanding intrinsics of Upp.

But let's me to understand my opinion. I think that Null approach is not narrow-minded but generic. It uses for Value, it uses for many simple types.

Because I use a lot the templates, overloaded functions and code generation I have to utilize the generic methods for every types that I want to use. And I use Null as some kind of parameter state that I can treat as:
1. Init/Non init
2. Error on function return.
3. Default values to call the function to distinguish it from nondefault values:

void some_fun(int a, int b = Null, bool c = Null, ...)
{
  if (b == Null)
    b = some_complex_calculated_value(a);
  ...
}

etc

So to see this approach for String's and Vector's I have to do workaround. May be I should not use the generics but another mechanism?

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[Message index]

		The problem with 'Null' By: gridem on Thu, 19 March 2009 08:04
		Re: The problem with 'Null' By: gridem on Thu, 19 March 2009 08:42
		Re: The problem with 'Null' By: cbpporter on Thu, 19 March 2009 08:45
		Re: The problem with 'Null' By: mirek on Thu, 19 March 2009 09:20
		Re: The problem with 'Null' By: gridem on Fri, 20 March 2009 08:16
		Re: The problem with 'Null' By: mirek on Fri, 20 March 2009 09:52
		Re: The problem with 'Null' By: gridem on Sun, 22 March 2009 09:15
		Re: The problem with 'Null' By: mirek on Mon, 23 March 2009 23:55
		Re: The problem with 'Null' By: gridem on Tue, 24 March 2009 08:41
		Re: The problem with 'Null' By: mirek on Tue, 24 March 2009 11:04
		Re: The problem with 'Null' By: mirek on Thu, 19 March 2009 09:16

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