d behavior. 
Therefore, there are specializations of <code>low_bits_mask_t</code> at
those bit counts.</p>

<h2><a name="example">Example</a></h2>

<blockquote><pre>
#include &lt;boost/integer/integer_mask.hpp&gt;

//...

int main()
{
    typedef boost::high_bit_mask_t&lt;29&gt;  mask1_type;
    typedef boost::low_bits_mask_t&lt;15&gt;  mask2_type;

    mask1_type::least  my_var1;
    mask2_type::fast   my_var2;
    //...

    my_var1 |= mask1_type::high_bit;
    my_var2 &amp;= mask2_type::sig_bits_fast;

 