how to use map properly when passing through method inside class in c++ -

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i can't make map work class, what's wrong here? can't figure out, please help: 

#include <map> #include <iterator>  class base { public:      bool delete_lowest(map<char, double> &frequencies)     {         double min=1; char del ; box b1;         (iterator itr = frequencies.begin(); itr != frequencies.end(); ++itr)         {             if(itr->second < min)             {                 min= itr->second ;                 del= itr->first ;             }         }         frequencies.erase(del) ;         return true;     }

i getting errors "map not declared" , on. think way code not proper way. how proceed? thanks

map in std namespace. try

bool delete_lowest(std::map<char, double> &frequencies)

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