[Insight-users] Defining a map of IndexTypes

[Luis Ibanez]

mm, Interesting...

Could you advice Matthias on what
the original compilation error is then ?

Maybe he is not passing the pointer
to the function ?


   Thanks


           Luis


-----------------------------------------------------------------------
On Wed, Oct 28, 2009 at 12:30 AM, Karthik Krishnan
<karthik.krishnan at kitware.com> wrote:
> Luis:
>
> The comparator can not only be a class (functor), but It can also be a
> function pointer with the exact signature that Matt described. In the
> latter case, the function pointer type is the third template argument
> and the function pointer must be passed in via the constructor.
>
> thx
> --
> karthik
>
>
> On Tue, Oct 27, 2009 at 10:10 PM, Luis Ibanez <luis.ibanez at kitware.com> wrote:
>> Hi Matthias,
>>
>> You are mis-constructing the map type.
>>
>> The code that you need is like the following:
>>
>> --------------------------------------------------------------------------
>> #include "itkImage.h"
>>
>> template <class TImageType>
>> class TEST
>> {
>> typedef typename    TImageType::IndexType       IndexType;
>>
>> struct ltstr
>> {
>>  bool operator()(const IndexType& lhs, const IndexType& rhs) const
>>    {
>>    //y1 is lower y2
>>    if(lhs[1]<rhs[1])return true;
>>    //y1==y2 and x1 < x2
>>    if((lhs[1]==rhs[1])&&(lhs[0]<rhs[0]))return true;
>>    //else
>>    return false;
>>    }
>> };
>>
>>
>> std::map<IndexType, bool, ltstr> recursionPoints;
>>
>> };
>>
>> int main()
>> {
>> return 0;
>> }
>>
>>
>>
>> Note that the comparator, the third template argument
>> of the std::map is actually a class, that has a method
>> operator().
>>
>> More at:
>> http://www.sgi.com/tech/stl/Map.html
>>
>>
>>      Regards,
>>
>>
>>             Luis
>>
>>
>> ---------------------------------
>> On Tue, Oct 27, 2009 at 12:00 PM, Matthias Dodt
>> <matthias.dodt at mdc-berlin.de> wrote:
>>> Hi there!
>>>
>>> I want to store IndexTypes in a map (as keys). I got the following code:
>>>          ...
>>>
>>>           typedef typename    TImageType::IndexType       IndexType;
>>>
>>>           bool fless(const IndexType& lhs, const IndexType& rhs) const
>>>           {
>>>             //y1 is lower y2
>>>             if(lhs[1]<rhs[1])return true;
>>>             //y1==y2 and x1 < x2
>>>             if((lhs[1]==rhs[1])&&(lhs[0]<rhs[0]))return true;
>>>             //else
>>>             return false;
>>>           }
>>>
>>>           typedef bool (*comp_t)( IndexType const &, IndexType const & );
>>>
>>>           std::map<IndexType, bool, comp_t> recursionPoints(fless);
>>>
>>> ...
>>>
>>> Anyway- i get an error saying that fless has no type. I think the problem is
>>> that IndexType is a template type...
>>>
>>> thanks!
>>>
>>>
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>