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C++ Bitsets [C++ Reference]
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<h1><a name="c_bitsets" id="c_bitsets">C++ Bitsets</a></h1>
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<p>
C++ Bitsets give the programmer a set of bits as a data structure. Bitsets can
be manipulated by various binary operators such as logical AND, OR, and so on.
</p>
<p>
The size of a C++ bitset is fixed at compile-time, and the size is the template
parameter to the bitset. If you wanted to use a bitset whose size you can fix at
runtime, you can use <a href="http://www.boost.org/doc/libs/1_42_0/libs/dynamic_bitset/dynamic_bitset.html" class="urlextern" title="http://www.boost.org/doc/libs/1_42_0/libs/dynamic_bitset/dynamic_bitset.html" rel="nofollow">dynamic_bitset</a> from the <a href="http://www.boost.org/" class="urlextern" title="http://www.boost.org/" rel="nofollow">Boost</a> library.
</p>
<table class="inline">
<tr class="row0">
<td class="col0"><a href="../../stl/bitset/bitset.html" class="wikilink1" title="stl:bitset:bitset_constructors">Constructors</a></td><td class="col1">create new bitsets</td>
</tr>
<tr class="row1">
<td class="col0"><a href="../../stl/bitset/operator.html" class="wikilink1" title="stl:bitset:bitset_operators">Operators</a></td><td class="col1">compare and assign bitsets</td>
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<td class="col0"><a href="../../stl/bitset/any.html" class="wikilink1" title="stl:bitset:any">any</a></td><td class="col1">true if any bits are set</td>
</tr>
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<td class="col0"><a href="../../stl/bitset/count.html" class="wikilink1" title="stl:bitset:count">count</a></td><td class="col1">returns the number of set bits</td>
</tr>
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<td class="col0"><a href="../../stl/bitset/flip.html" class="wikilink1" title="stl:bitset:flip">flip</a></td><td class="col1">reverses the bitset</td>
</tr>
<tr class="row5">
<td class="col0"><a href="../../stl/bitset/none.html" class="wikilink1" title="stl:bitset:none">none</a></td><td class="col1">true if no bits are set</td>
</tr>
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<td class="col0"><a href="../../stl/bitset/reset.html" class="wikilink1" title="stl:bitset:reset">reset</a></td><td class="col1">sets a single bit or all bits to zero</td>
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<td class="col0"><a href="../../stl/bitset/set.html" class="wikilink1" title="stl:bitset:set">set</a></td><td class="col1">sets a single bit or all bits</td>
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<td class="col0"><a href="../../stl/bitset/size.html" class="wikilink1" title="stl:bitset:size">size</a></td><td class="col1">number of bits that the bitset can hold</td>
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<td class="col0"><a href="../../stl/bitset/test.html" class="wikilink1" title="stl:bitset:test">test</a></td><td class="col1">returns the value of a given bit</td>
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<td class="col0"><a href="../../stl/bitset/to_string.html" class="wikilink1" title="stl:bitset:to_string">to_string</a></td><td class="col1">string representation of the bitset</td>
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<td class="col0"><a href="../../stl/bitset/to_ulong.html" class="wikilink1" title="stl:bitset:to_ulong">to_ulong</a></td><td class="col1">returns an integer representation of the bitset</td>
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<h3><a name="notes" id="notes">Notes:</a></h3>
<div class="level3">
<p>
Bit set is missing two boolean queries to compliment <a href="../../stl/bitset/any.html" class="wikilink1" title="stl:bitset:any">any</a> and <a href="../../stl/bitset/none.html" class="wikilink1" title="stl:bitset:none">none</a>: <code>all()</code> and <code>some()</code>.
</p>
<ul>
<li class="level1"><div class="li"> all: <code>(~bitset).none()</code></div>
</li>
<li class="level1"><div class="li"> some: <code>(~bitset).any()</code></div>
</li>
</ul>
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