Operator[] works for eigen vectors, the following is taken from the online
documentation
"The operator[] is also overloaded for index-based access in vectors, but
keep in mind that C++ doesn't allow operator[] to take more than one
argument. We restrict operator[] to vectors, because an awkwardness in the
C++ language would make matrix[i,j] compile to the same thing as matrix[j]
!"
Lorenzo
On Oct 27, 2012 1:31 AM, "Lei Shi" <stonesz...@gmail.com> wrote:
> Sorry for the late.
>
> It seems that in order to provide backward compatible APIs, we need such
> kind of shim class. Roy, What is your final decision?
>
> Sincerely Yours,
>
> Lei Shi
> ----------
>
>
> On Thu, Oct 25, 2012 at 1:21 PM, Roy Stogner <royst...@ices.utexas.edu>wrote:
>
>>
>> On Thu, 25 Oct 2012, Boyce Griffith wrote:
>>
>> Libraries like Eigen and Blitz++ use operator() for accessors rather
>>> than operator[]. How horrible would it be to go ahead and change to
>>> operator() when making this change to LibMeshNArray?
>>>
>>
>> Hmmm... it would mean that we couldn't get away with starting with
>> just a typedef, we'd actually have to build a basic shim class right
>> from the start, and it would be much more of a pain in the neck for
>> user codes to upgrade.
>>
>> On the other hand, if we did want to keep operator[] support around
>> indefinitely and we end up with a target class that doesn't support
>> it, that would mean we'd have to keep a shim class around
>> indefinitely... *and* we'd make it much less convenient to use a
>> different-semantic operator[] from the target class, e.g. the Blitz++
>> component accessor.
>>
>> More opinions would be welcome; I'm not even sure what I'd prefer yet.
>> ---
>> Roy
>>
>
>
>
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