std::copy to std::cout for std::pair

Question

I have next code:

#include 
#include 
#include 

Answer 1

What you want is a transforming iterator. This kind of iterator wraps another iterator, forwards all positioning methods like operator++ and operator==, but redefines operator* and operator->.

Quick sketch :

template  
struct transformingIterator : private ITER {
    transformingIterator(ITER const& base) : ITER(base) {}
    transformingIterator& operator++() { ITER::operator++(); return *this; }
    std::string operator*() const
    {
        ITER::value_type const& v = ITER::operator*();
        return "[" + v->first +", " + v->second + "]";
    }
...