m Boost 1.31.0</i></h4>
<ul>
<li>
The stream extractor has completely different semantics: as natural
for a dynamic structure, it now expands the bitset as needed during
extraction. The new behaviour mimics that of the <tt>basic_string</tt>
extractor but there are some differences the user should be aware of;
so, please, check the <a href="#op-in">documentation</a>. (One
difference concerns the case where <code>stream.width() &gt;
    bitset.max_size() &gt; 0</code>. In that circumstance the
extractor of <t