Re: [Toon-members] TooN bug? (affects libCVD)

[Ethan Eade]

This is because the return value of slice() is not a reference, and GCC 
isn't allowed to convert it to a non-const reference.  To get around 
this problem, I long ago added cast operators to DynamicMatrix, which 
just turn an instance into a non-const reference.  GCC is not 
technically supposed to use these, but it did anyway.  Now it is finally 
refusing to do so.  So the options are:

1.  Add operator methods directly to DynamicMatrix.
2.  Add a ref() method to DynamicMatrix which returns a reference to 
itself, and then do:
         m.slice(0,0,3,3).ref() += ....
     
   [This is what people do, using the flush() method, in order to use 
temporary ostreams:  (ostringstream().flush() << stuff_to_output).str() ]

3.  Define special operator functions that take wrapper objects to the 
things that slice() returns, and handles them appropriately

The first one will look nicer for the user, but will duplicate the 
operator code in TooN, and make maintenance difficult.  The second will 
be annoying and non-uniform for the user, but will work.  I haven't 
worked out the details of the third option.  How annoying.

- Ethan


Edward Rosten wrote:
> On Thu, 24 Jul 2008, Edward Rosten wrote:
>
> > The return type of .slice() is RefSkipMatrixRM, which is a 
> > DynamicMatrix<RefSkipMAccessor<RowMajor> > . I can't see how line 842 
> > isn't enough of a match. Any ideas?
>
> That shold be line 835
>
> -Ed
>
>
>
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