#include <boost/bit_logic/bit_vector.hpp> 
   iterator insert ( iterator loc , bool val ) ;
   void insert ( iterator loc, std::size_t num, bool val ) ; 
   std::size_t insert ( std::size_t insert_idx , BitTypeT const & insert_val ) ;

The insert() function inserts data into a bit_vector at a given location, shifting any bits above that location up to accomodate the size of the inserted data.

 bit_vector<> v ( 4 ) ; 
 bit_array<4> a ; 
 a = "1111" ;
 v.insert ( v.size(), a ) ; 
 cout << hex << v ;

This code produces the following output:

 f0

bit_logic::bit_out_of_range	insert location outside of valid range of
std::runtime_error	Bad iterators that aren't within the valid iterator range