 == 0</tt>.<br />
 <b>Throws:</b> nothing.

<hr />
<pre>
<a id="cons2">dynamic_bitset</a>(size_type num_bits,
               unsigned long value = 0,
               const Allocator&amp; alloc = Allocator())
</pre>

<b>Effects:</b> Constructs a bitset from an integer. The first
<tt>M</tt> bits are initialized to the corresponding bits in
<tt>value</tt> and all other bits, if any, to zero (where <tt>M =
min(num_bits, std::numeric_limits&lt;unsigned long&gt;::digits)</tt>). A copy of
the <tt>alloc</tt> object 