[Insight-developers] Best method for a do-nothing return-valuefunction

[gang song]

Or you can try
return NumericTraits<TValue>::Zero;
if zero value looks more general to your case and this has to pass the
NumericTraits concept checking in compiling.


On Fri, Dec 17, 2010 at 9:03 PM, M Stauffer (V) <mstauff at verizon.net> wrote:
> Yes, it should simply return the input value. This is so the base class
> can be used by default w/out it actually doing anything.
>
> Cheers,
> Michael
>
>>-----Original Message-----
>>From: Hans Johnson [mailto:hans-johnson at uiowa.edu]
>>Sent: Friday, December 17, 2010 7:29 PM
>>To: M Stauffer (V); ITK
>>Subject: Re: [Insight-developers] Best method for a do-nothing
>>return-valuefunction
>>
>>Do you ever intend to use the base class Evaluate?  If not, you should
>>probably make it an abstract member function that only defines
>>the intended
>>interface.
>>
>>TValue Evaluate( TValue value ) = 0;
>>
>>Hans
>>--
>>Hans J. Johnson, Ph.D.
>>Hans-johnson at uiowa.edu
>>
>>278 GH
>>The University of Iowa
>>Iowa City, IA 52241
>>(319) 353 8587
>>
>>
>>> From: "M Stauffer (V)" <mstauff at verizon.net>
>>> Date: Fri, 17 Dec 2010 18:09:34 -0500
>>> To: ITK <insight-developers at itk.org>
>>> Subject: [Insight-developers] Best method for a do-nothing
>>> return-valuefunction
>>>
>>> Hi,
>>>
>>> I'm not sure how to phrase the subject. I'm creating a function base
>>> class whose "Evaluate", i.e. do-its-thing, method needs to
>>simply return
>>> the input value. Derived classes will modify the value in
>>some way, not
>>> surprisingly.
>>>
>>> Is there a more efficient way to implement this than what I
>>have below?
>>> I figure most compilers will actually make this inline, but maybe not
>>> all?
>>>
>>> < typename TValue >
>>> class FunctionBase {
>>>
>>> ...
>>>   inline TValue Evaluate( TValue value ) { return value; }
>>> ...
>>>
>>> };
>>>
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>
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