bool operator ==(const itor& it) { return m_ptr == it.m_ptr; } \
bool operator !=(const itor& it) { return m_ptr != it.m_ptr; } \
}; \
bool operator ==(const itor& it) { return m_ptr == it.m_ptr; } \
bool operator !=(const itor& it) { return m_ptr != it.m_ptr; } \
}; \