std::map < unsigned int, int/*dummy*/ >::const_iterator it;
std::map < unsigned int, int/*dummy*/ >::const_iterator it_min(a_data.begin());
std::map < unsigned int, int/*dummy*/ >::const_iterator it_max(a_data.end());
std::map < unsigned int, int/*dummy*/ >::const_iterator it;
std::map < unsigned int, int/*dummy*/ >::const_iterator it_min(a_data.begin());
std::map < unsigned int, int/*dummy*/ >::const_iterator it_max(a_data.end());