hrows:</b> Nothing unless the default constructor of
<tt>Allocator</tt> throws an exception.<br />
 (Required by <a href=
"https://boost.org/sgi/stl/DefaultConstructible.html">Default
Constructible</a>.)

<hr />
<pre>
<a id=
"cons1">dynamic_bitset</a>(const Allocator&amp; alloc)
</pre>

<b>Effects:</b> Constructs a bitset of size zero. A copy of the
<tt>alloc</tt> object will be used in subsequent bitset
operations such as <tt>resize</tt> to allocate memory.<br />
 <b>Postconditions:</b> <tt>this-&gt;size()