[Ndn-interest] Problem with Interest and Data structure in c++

[Matteo Bertolino]

Thank you for the advice!
If somebody had a similar problem, here there is my solution:

struct cmpInterests {
     bool operator()(const Interest& a, const Interest& b) const {
         return a.getName().compare(b.getName());
     }
};
std::map<Interest, int, cmpInterests> mappa;

I do not know if it is suitable for my purposes, but at least the  
compilation errors are solved.

Sincerely,
Matteo


Quoting Alex Afanasyev <aa at cs.ucla.edu>:

>
>> On Sep 20, 2016, at 9:41 AM, Matteo Bertolino   
>> <Matteo.Bertolino at eurecom.fr> wrote:
>>
>> Good morning to all,
>> I write in order to ask your help with a problem.
>> I would like to do a Map <Interest, int>.
>>
>> So I wrote:
>> std::map<Interest, int> mappa;
>> but each operation on it fails, like:
>> int numbEntries = mappa.count(nack.getInterest());
>> or
>> std::map<Interest,int>::iterator it = mappa.find (nack.getInterest());
>> or
>> Interest x: mappa[x] = 5;
>>
>> The error is always the same:
>> /usr/include/c++/4.9/bits/stl_function.h:371:20: error: no match  
>> for ‘operator<’ (operand types are ‘const ndn::Interest’ and ‘const  
>> ndn::Interest’)
>>       { return __x < __y; }
>>
>> Then I think to redefine operator "<" into interest.cpp, writing:
>> bool
>>  operator<(const ndn::Interest ones, const ndn::Interest other)
>>  {
>>    return ones.getName().compare(other.getName())<0;
>>  }
>
> For C++ to find the method, you need to define this operator in the   
> same namespace as Interest, e.g.,
>
> namespace ndn {
>
> bool
> operator<(const Interest& i1, const Interest& i2)
> {
>     ... // you may need to include additional comparisons in   
> addition to checking names
> }
>
> }
>
> ---
> Alex
>
>> But, also here, no effect.
>> Any idea?
>> Thank you,
>> Matteo
>>
>>
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>

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