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

[Alex Afanasyev]

> 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> myMap;
> 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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