template<class DomainT , class CodomainT , class Traits , ITL_COMPARE Compare, 
         ITL_COMBINE Combine, ITL_SECTION Section, ITL_ALLOC Alloc> 
  itl::map< DomainT, CodomainT, Traits, Compare, Combine, Section, Alloc > & 
  operator&=(itl::map< DomainT, CodomainT, Traits, Compare, Combine, Section, Alloc > & object, 
             const typename itl::map< DomainT, CodomainT, Traits, Compare, Combine, Section, Alloc >::set_type & operand);