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<li><a class="el" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html">geos::index::quadtree::DoubleBits</a> </li>
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<a href="#pub-methods">Public Member Functions</a> |
<a href="#pub-static-methods">Static Public Member Functions</a> |
<a href="#pub-static-attribs">Static Public Attributes</a> </div>
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<h1>geos::index::quadtree::DoubleBits Class Reference</h1> </div>
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<!-- doxytag: class="geos::index::quadtree::DoubleBits" -->
<p><a class="el" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html" title="DoubleBits manipulates Double numbers by using bit manipulation and bit-field extraction.">DoubleBits</a> manipulates Double numbers by using bit manipulation and bit-field extraction.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="DoubleBits_8h_source.html">DoubleBits.h</a>></code></p>
<p><a href="classgeos_1_1index_1_1quadtree_1_1DoubleBits-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8820e3b716e42983d50ad72af874e0eb"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::DoubleBits" ref="a8820e3b716e42983d50ad72af874e0eb" args="(double nx)" -->
</td><td class="memItemRight" valign="bottom"><b>DoubleBits</b> (double nx)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a6670e4596f08d0d15105c4bb454d1682"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::getDouble" ref="a6670e4596f08d0d15105c4bb454d1682" args="() const " -->
double </td><td class="memItemRight" valign="bottom"><b>getDouble</b> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a017d2bdf360c8db4631cba0dab2d9b08"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::biasedExponent" ref="a017d2bdf360c8db4631cba0dab2d9b08" args="() const " -->
int64 </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html#a017d2bdf360c8db4631cba0dab2d9b08">biasedExponent</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Determines the exponent for the number. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af1167ee742f40b9adae353b9e340baca"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::getExponent" ref="af1167ee742f40b9adae353b9e340baca" args="() const " -->
int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html#af1167ee742f40b9adae353b9e340baca">getExponent</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Determines the exponent for the number. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3caa1e1abc70e8ed49a5692ac87a299a"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::zeroLowerBits" ref="a3caa1e1abc70e8ed49a5692ac87a299a" args="(int nBits)" -->
void </td><td class="memItemRight" valign="bottom"><b>zeroLowerBits</b> (int nBits)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a62fa562b5643c5f58c50a28942f0a802"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::getBit" ref="a62fa562b5643c5f58c50a28942f0a802" args="(int i) const " -->
int </td><td class="memItemRight" valign="bottom"><b>getBit</b> (int i) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html#a8ac3df9612e3831e7d28641fd77275b2">numCommonMantissaBits</a> (const <a class="el" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html">DoubleBits</a> &db) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">This computes the number of common most-significant bits in the mantissa. <a href="#a8ac3df9612e3831e7d28641fd77275b2"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af54c64b2c7e4110617c67881d9ad2463"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::toString" ref="af54c64b2c7e4110617c67881d9ad2463" args="() const " -->
std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html#af54c64b2c7e4110617c67881d9ad2463">toString</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A representation of the Double bits formatted for easy readability. <br/></td></tr>
<tr><td colspan="2"><h2><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a62ba7279e8d7967c9c456cb366c7b7e2"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::powerOf2" ref="a62ba7279e8d7967c9c456cb366c7b7e2" args="(int exp)" -->
static double </td><td class="memItemRight" valign="bottom"><b>powerOf2</b> (int exp)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3ed6a8e56ece0087401f781e3acf7568"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::exponent" ref="a3ed6a8e56ece0087401f781e3acf7568" args="(double d)" -->
static int </td><td class="memItemRight" valign="bottom"><b>exponent</b> (double d)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a63bc6a4c5bb097369b32247d371263d0"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::truncateToPowerOfTwo" ref="a63bc6a4c5bb097369b32247d371263d0" args="(double d)" -->
static double </td><td class="memItemRight" valign="bottom"><b>truncateToPowerOfTwo</b> (double d)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a4cb86f31f7c86c81db410207aa6aec8c"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::toBinaryString" ref="a4cb86f31f7c86c81db410207aa6aec8c" args="(double d)" -->
static std::string </td><td class="memItemRight" valign="bottom"><b>toBinaryString</b> (double d)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aec81346a758589ed33a92915a0307c8a"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::maximumCommonMantissa" ref="aec81346a758589ed33a92915a0307c8a" args="(double d1, double d2)" -->
static double </td><td class="memItemRight" valign="bottom"><b>maximumCommonMantissa</b> (double d1, double d2)</td></tr>
<tr><td colspan="2"><h2><a name="pub-static-attribs"></a>
Static Public Attributes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a14b2212b19ce4c82defdaebbbf0916c2"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::EXPONENT_BIAS" ref="a14b2212b19ce4c82defdaebbbf0916c2" args="" -->
static const int </td><td class="memItemRight" valign="bottom"><b>EXPONENT_BIAS</b> = 1023</td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p><a class="el" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html" title="DoubleBits manipulates Double numbers by using bit manipulation and bit-field extraction.">DoubleBits</a> manipulates Double numbers by using bit manipulation and bit-field extraction. </p>
<p>For some operations (such as determining the exponent) this is more accurate than using mathematical operations (which suffer from round-off error).</p>
<p>The algorithms and constants in this class apply only to IEEE-754 double-precision floating point format. </p>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a8ac3df9612e3831e7d28641fd77275b2"></a><!-- doxytag: member="geos::index::quadtree::DoubleBits::numCommonMantissaBits" ref="a8ac3df9612e3831e7d28641fd77275b2" args="(const DoubleBits &db) const " -->
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<td class="memname">int geos::index::quadtree::DoubleBits::numCommonMantissaBits </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classgeos_1_1index_1_1quadtree_1_1DoubleBits.html">DoubleBits</a> & </td>
<td class="paramname"> <em>db</em></td>
<td> ) </td>
<td> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>This computes the number of common most-significant bits in the mantissa. </p>
<p>It does not count the hidden bit, which is always 1. It does not determine whether the numbers have the same exponent; if they do not, the value computed by this function is meaningless.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>db</em> </td><td></td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>the number of common most-significant mantissa bits </dd></dl>
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="DoubleBits_8h_source.html">DoubleBits.h</a></li>
</ul>
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