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

[Hans Johnson]

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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