#include <boost/bit_logic/bit_array.hpp>
   bit_array ( ) ; 
   bit_array ( bool val = false ); 
   bit_array ( bit_array const & copy_bit_array ) ;
   ~bit_array ( ) ; 

N	Number of bits fixed size bit_array will contain.

The default bit_array construct a bit_array with all values set to 0. The copy constructor duplicates the original size and contents of the copied vector

For example:

 bit_array<16> simple ( ); 
 cout << simple << endl ;

This code would produce this output:

 0000000000000000

Now creating a bit_array with values defaulted to all 1's.

 bit_array<16> ba2 (true); 
 cout << ba2 << endl ;

This code would produce this output:

 1111111111111111