class vector<bool, allocator<bool> > { typedef allocator<bool> A; public: class reference; typedef bool
const_reference; typedef T0 iterator; typedef T1 const_iterator; void flip(); static void swap(reference x,
reference y); // rest same as template class vector }; The class is a specialization of template class vector for elements of type bool. It alters the definition of four member
types (to optimize the packing and unpacking of elements) and adds two member functions. Its behavior is otherwise
the same as for template class vector.
In this implementation, if partial specializations are not supported or if bool is not a distinct type, the class should be
referred to by the synonym _Bvector.