Re: Using unique with std::map

How can I use unique algorithm with map container?

I can't compile the following neither using STL Port, nor MSVC.8 STL
implementation:

#include <stdio.h>
#include <iostream>
#include <map>
#include <algorithm>

template <typename _PairType>
struct compare_second
{
        bool operator() (const _PairType& _left, const _PairType& _right)
const
        {
                return (_left.second == _right.second);
        }

};

typedef std::pair <int, std::string> PairType;
typedef std::map <int, std::string> MapType;

int main(int /*argc*/, char* /*argv[]*/)
{

        MapType m;

        const char* text[] =
        { "aaa"
        , "bbb"
        , "aaa"
        };

        for (int i=0; i < sizeof(text)/sizeof(text[0]);++i)
m.insert(std::make_pair(i,text[i]));

        //c:\msvs8.0\vc\include\algorithm(1150) : error C2582:
        //'operator =' function is unavailable in 'std::pair<_Ty1,_Ty2>'

        MapType::iterator end = std::unique(m.begin(), m.end(),
compare_second<PairType>());

        return 0;

}