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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>Xapian: API Documentation: Xapian::Weight Class Reference</title>
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<li class="navelem"><a class="el" href="namespaceXapian.html">Xapian</a></li><li class="navelem"><a class="el" href="classXapian_1_1Weight.html">Weight</a></li> </ul>
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<a href="#pub-types">Public Types</a> |
<a href="#pub-methods">Public Member Functions</a> |
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<a href="#pro-methods">Protected Member Functions</a> |
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<div class="title">Xapian::Weight Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span></div> </div>
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<div class="contents">
<p>Abstract base class for weighting schemes.
<a href="classXapian_1_1Weight.html#details">More...</a></p>
<div id="dynsection-0" onclick="return toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;">
<img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for Xapian::Weight:</div>
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<div class="center"><img src="classXapian_1_1Weight__inherit__graph.png" border="0" usemap="#Xapian_1_1Weight_inherit__map" alt="Inheritance graph"/></div>
<map name="Xapian_1_1Weight_inherit__map" id="Xapian_1_1Weight_inherit__map">
<area shape="rect" id="node2" href="classXapian_1_1BB2Weight.html" title="This class implements the BB2 weighting scheme. " alt="" coords="181,5,317,32"/>
<area shape="rect" id="node3" href="classXapian_1_1BM25PlusWeight.html" title="Xapian::Weight subclass implementing the BM25+ probabilistic formula. " alt="" coords="164,56,335,83"/>
<area shape="rect" id="node4" href="classXapian_1_1BM25Weight.html" title="Xapian::Weight subclass implementing the BM25 probabilistic formula. " alt="" coords="177,107,322,133"/>
<area shape="rect" id="node5" href="classXapian_1_1BoolWeight.html" title="Class implementing a "boolean" weighting scheme. " alt="" coords="181,157,318,184"/>
<area shape="rect" id="node6" href="classXapian_1_1CoordWeight.html" title="Xapian::Weight subclass implementing Coordinate Matching. " alt="" coords="176,208,323,235"/>
<area shape="rect" id="node7" href="classXapian_1_1DLHWeight.html" title="This class implements the DLH weighting scheme, which is a representative scheme of the Divergence fr..." alt="" coords="180,259,319,285"/>
<area shape="rect" id="node8" href="classXapian_1_1DPHWeight.html" title="This class implements the DPH weighting scheme. " alt="" coords="179,309,319,336"/>
<area shape="rect" id="node9" href="classXapian_1_1IfB2Weight.html" title="This class implements the IfB2 weighting scheme. " alt="" coords="182,360,317,387"/>
<area shape="rect" id="node10" href="classXapian_1_1IneB2Weight.html" title="This class implements the IneB2 weighting scheme. " alt="" coords="177,411,322,437"/>
<area shape="rect" id="node11" href="classXapian_1_1InL2Weight.html" title="This class implements the InL2 weighting scheme. " alt="" coords="181,461,317,488"/>
<area shape="rect" id="node12" href="classXapian_1_1LMWeight.html" title="Xapian::Weight subclass implementing the Language Model formula. " alt="" coords="185,512,314,539"/>
<area shape="rect" id="node13" href="classXapian_1_1PL2PlusWeight.html" title="Xapian::Weight subclass implementing the PL2+ probabilistic formula. " alt="" coords="169,563,329,589"/>
<area shape="rect" id="node14" href="classXapian_1_1PL2Weight.html" title="This class implements the PL2 weighting scheme. " alt="" coords="182,613,317,640"/>
<area shape="rect" id="node15" href="classXapian_1_1TfIdfWeight.html" title="Xapian::Weight subclass implementing the tf-idf weighting scheme. " alt="" coords="180,664,319,691"/>
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</map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr class="memitem:a3181bb7619bd560a3a2c21ece3213ce0"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a3181bb7619bd560a3a2c21ece3213ce0">type_smoothing</a> { <br />
  <b>TWO_STAGE_SMOOTHING</b> = 1,
<b>DIRICHLET_SMOOTHING</b> = 2,
<b>ABSOLUTE_DISCOUNT_SMOOTHING</b> = 3,
<b>JELINEK_MERCER_SMOOTHING</b> = 4,
<br />
  <b>DIRICHLET_PLUS_SMOOTHING</b> = 5
<br />
}<tr class="memdesc:a3181bb7619bd560a3a2c21ece3213ce0"><td class="mdescLeft"> </td><td class="mdescRight">Type of smoothing to use with the Language Model Weighting scheme. <a href="classXapian_1_1Weight.html#a3181bb7619bd560a3a2c21ece3213ce0">More...</a><br /></td></tr>
</td></tr>
<tr class="separator:a3181bb7619bd560a3a2c21ece3213ce0"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a48e8f4d351f2a090bcec111513833e0f"><td class="memItemLeft" align="right" valign="top"><a id="a48e8f4d351f2a090bcec111513833e0f"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a48e8f4d351f2a090bcec111513833e0f">Weight</a> ()</td></tr>
<tr class="memdesc:a48e8f4d351f2a090bcec111513833e0f"><td class="mdescLeft"> </td><td class="mdescRight">Default constructor, needed by subclass constructors. <br /></td></tr>
<tr class="separator:a48e8f4d351f2a090bcec111513833e0f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:adcc0dd3e0c762597e89720043440a0bd"><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#adcc0dd3e0c762597e89720043440a0bd">~Weight</a> ()</td></tr>
<tr class="memdesc:adcc0dd3e0c762597e89720043440a0bd"><td class="mdescLeft"> </td><td class="mdescRight">Virtual destructor, because we have virtual methods. <a href="#adcc0dd3e0c762597e89720043440a0bd">More...</a><br /></td></tr>
<tr class="separator:adcc0dd3e0c762597e89720043440a0bd"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5663bb152f93f08dcc07e0b4a39ddbc3"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="classXapian_1_1Weight.html">Weight</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a5663bb152f93f08dcc07e0b4a39ddbc3">clone</a> () const =0</td></tr>
<tr class="memdesc:a5663bb152f93f08dcc07e0b4a39ddbc3"><td class="mdescLeft"> </td><td class="mdescRight">Clone this object. <a href="#a5663bb152f93f08dcc07e0b4a39ddbc3">More...</a><br /></td></tr>
<tr class="separator:a5663bb152f93f08dcc07e0b4a39ddbc3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6106970d1a1e9600c9b32cc6ec96bf6b"><td class="memItemLeft" align="right" valign="top">virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a6106970d1a1e9600c9b32cc6ec96bf6b">name</a> () const</td></tr>
<tr class="memdesc:a6106970d1a1e9600c9b32cc6ec96bf6b"><td class="mdescLeft"> </td><td class="mdescRight">Return the name of this weighting scheme. <a href="#a6106970d1a1e9600c9b32cc6ec96bf6b">More...</a><br /></td></tr>
<tr class="separator:a6106970d1a1e9600c9b32cc6ec96bf6b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5162368a30a0fc10d69359665b5d8e0e"><td class="memItemLeft" align="right" valign="top">virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a5162368a30a0fc10d69359665b5d8e0e">serialise</a> () const</td></tr>
<tr class="memdesc:a5162368a30a0fc10d69359665b5d8e0e"><td class="mdescLeft"> </td><td class="mdescRight">Return this object's parameters serialised as a single string. <a href="#a5162368a30a0fc10d69359665b5d8e0e">More...</a><br /></td></tr>
<tr class="separator:a5162368a30a0fc10d69359665b5d8e0e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a61bf13e666fb72de2ccc150ce0c3310a"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="classXapian_1_1Weight.html">Weight</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a61bf13e666fb72de2ccc150ce0c3310a">unserialise</a> (const std::string &serialised) const</td></tr>
<tr class="memdesc:a61bf13e666fb72de2ccc150ce0c3310a"><td class="mdescLeft"> </td><td class="mdescRight">Unserialise parameters. <a href="#a61bf13e666fb72de2ccc150ce0c3310a">More...</a><br /></td></tr>
<tr class="separator:a61bf13e666fb72de2ccc150ce0c3310a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6b60672542f4252fd000641a359107a1"><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a6b60672542f4252fd000641a359107a1">get_sumpart</a> (<a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> wdf, <a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> doclen, <a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> uniqterms) const =0</td></tr>
<tr class="memdesc:a6b60672542f4252fd000641a359107a1"><td class="mdescLeft"> </td><td class="mdescRight">Calculate the weight contribution for this object's term to a document. <a href="#a6b60672542f4252fd000641a359107a1">More...</a><br /></td></tr>
<tr class="separator:a6b60672542f4252fd000641a359107a1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a791cd50a4ab7f2c4f1d9786433033d79"><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a791cd50a4ab7f2c4f1d9786433033d79">get_maxpart</a> () const =0</td></tr>
<tr class="memdesc:a791cd50a4ab7f2c4f1d9786433033d79"><td class="mdescLeft"> </td><td class="mdescRight">Return an upper bound on what <a class="el" href="classXapian_1_1Weight.html#a6b60672542f4252fd000641a359107a1" title="Calculate the weight contribution for this object's term to a document. ">get_sumpart()</a> can return for any document. <a href="#a791cd50a4ab7f2c4f1d9786433033d79">More...</a><br /></td></tr>
<tr class="separator:a791cd50a4ab7f2c4f1d9786433033d79"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a77d87bf5be452399b7c9f72f3b41e5c0"><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a77d87bf5be452399b7c9f72f3b41e5c0">get_sumextra</a> (<a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> doclen, <a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> uniqterms) const =0</td></tr>
<tr class="memdesc:a77d87bf5be452399b7c9f72f3b41e5c0"><td class="mdescLeft"> </td><td class="mdescRight">Calculate the term-independent weight component for a document. <a href="#a77d87bf5be452399b7c9f72f3b41e5c0">More...</a><br /></td></tr>
<tr class="separator:a77d87bf5be452399b7c9f72f3b41e5c0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a019d010275b6e8130a4c5c746fdf32a1"><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a019d010275b6e8130a4c5c746fdf32a1">get_maxextra</a> () const =0</td></tr>
<tr class="memdesc:a019d010275b6e8130a4c5c746fdf32a1"><td class="mdescLeft"> </td><td class="mdescRight">Return an upper bound on what <a class="el" href="classXapian_1_1Weight.html#a77d87bf5be452399b7c9f72f3b41e5c0" title="Calculate the term-independent weight component for a document. ">get_sumextra()</a> can return for any document. <a href="#a019d010275b6e8130a4c5c746fdf32a1">More...</a><br /></td></tr>
<tr class="separator:a019d010275b6e8130a4c5c746fdf32a1"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-types"></a>
Protected Types</h2></td></tr>
<tr class="memitem:ae3c11f1d2d96a18e0eb9b9b31c5c5479"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479">stat_flags</a> { <br />
  <a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479abce4fe48f6f680644bd352acc937856e">COLLECTION_SIZE</a> = 1,
<a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479a632727fa617eec2dfa9ad19e6adcb926">RSET_SIZE</a> = 2,
<a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479a5ce8ff7822abec06e0f5ac956d7b247e">AVERAGE_LENGTH</a> = 4,
<a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479ab2b087be2c0ffd8a2ea214298156f99b">TERMFREQ</a> = 8,
<br />
  <a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479afd0979b74a0cf07991edc4af31ed55be">RELTERMFREQ</a> = 16,
<a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479a1a95530f6aa2ca909e4c1620aed8192b">QUERY_LENGTH</a> = 32,
<a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479ab383711f122cf1927e418dc94e8ed1a7">WQF</a> = 64,
<a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479afe84a106f8ec14c79acdfc29d9378aa2">WDF</a> = 128,
<br />
  <a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479a92ac55fbe32f39c3b4cdcab135ac0722">DOC_LENGTH</a> = 256,
<a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479ac9f88f7ca707347bcce2c1ad0abdf531">DOC_LENGTH_MIN</a> = 512,
<a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479a8f07b317ab1fca84d17cab78aa412e37">DOC_LENGTH_MAX</a> = 1024,
<a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479abe608cc5dc83deef0f35c13a69aa15dc">WDF_MAX</a> = 2048,
<br />
  <a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479ad923b48160007ce82f9db96f4f44c700">COLLECTION_FREQ</a> = 4096,
<a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479a429d945066f46ee1449e1be35f897bf2">UNIQUE_TERMS</a> = 8192
<br />
}<tr class="memdesc:ae3c11f1d2d96a18e0eb9b9b31c5c5479"><td class="mdescLeft"> </td><td class="mdescRight">Stats which the weighting scheme can use (see <em><a class="el" href="classXapian_1_1Weight.html#a77b1424d5f5a5b2d4848175979da6475" title="Tell Xapian that your subclass will want a particular statistic. ">need_stat()</a></em>). <a href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479">More...</a><br /></td></tr>
</td></tr>
<tr class="separator:ae3c11f1d2d96a18e0eb9b9b31c5c5479"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr class="memitem:a77b1424d5f5a5b2d4848175979da6475"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a77b1424d5f5a5b2d4848175979da6475">need_stat</a> (<a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479">stat_flags</a> flag)</td></tr>
<tr class="memdesc:a77b1424d5f5a5b2d4848175979da6475"><td class="mdescLeft"> </td><td class="mdescRight">Tell <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> that your subclass will want a particular statistic. <a href="#a77b1424d5f5a5b2d4848175979da6475">More...</a><br /></td></tr>
<tr class="separator:a77b1424d5f5a5b2d4848175979da6475"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a71cd77c24183e837313ec13d967ddf2c"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a71cd77c24183e837313ec13d967ddf2c">init</a> (double factor)=0</td></tr>
<tr class="memdesc:a71cd77c24183e837313ec13d967ddf2c"><td class="mdescLeft"> </td><td class="mdescRight">Allow the subclass to perform any initialisation it needs to. <a href="#a71cd77c24183e837313ec13d967ddf2c">More...</a><br /></td></tr>
<tr class="separator:a71cd77c24183e837313ec13d967ddf2c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa7acc105949dcb3b8b343a598dd01487"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#aa7acc105949dcb3b8b343a598dd01487">Weight</a> (const <a class="el" href="classXapian_1_1Weight.html">Weight</a> &)</td></tr>
<tr class="memdesc:aa7acc105949dcb3b8b343a598dd01487"><td class="mdescLeft"> </td><td class="mdescRight">Don't allow copying. <a href="#aa7acc105949dcb3b8b343a598dd01487">More...</a><br /></td></tr>
<tr class="separator:aa7acc105949dcb3b8b343a598dd01487"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa0c27dd474ebbf95c8b3247c2a49686f"><td class="memItemLeft" align="right" valign="top"><a id="aa0c27dd474ebbf95c8b3247c2a49686f"></a>
<a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#aa0c27dd474ebbf95c8b3247c2a49686f">get_collection_size</a> () const</td></tr>
<tr class="memdesc:aa0c27dd474ebbf95c8b3247c2a49686f"><td class="mdescLeft"> </td><td class="mdescRight">The number of documents in the collection. <br /></td></tr>
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<tr class="memitem:a7d32c6eb63d262e27c8e06b6254dc2ae"><td class="memItemLeft" align="right" valign="top"><a id="a7d32c6eb63d262e27c8e06b6254dc2ae"></a>
<a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a7d32c6eb63d262e27c8e06b6254dc2ae">get_rset_size</a> () const</td></tr>
<tr class="memdesc:a7d32c6eb63d262e27c8e06b6254dc2ae"><td class="mdescLeft"> </td><td class="mdescRight">The number of documents marked as relevant. <br /></td></tr>
<tr class="separator:a7d32c6eb63d262e27c8e06b6254dc2ae"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aac08743bb731357a46f58bc1c9dd8739"><td class="memItemLeft" align="right" valign="top"><a id="aac08743bb731357a46f58bc1c9dd8739"></a>
<a class="el" href="namespaceXapian.html#a63b13d3a36fcab9975658e32643d86b5">Xapian::doclength</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#aac08743bb731357a46f58bc1c9dd8739">get_average_length</a> () const</td></tr>
<tr class="memdesc:aac08743bb731357a46f58bc1c9dd8739"><td class="mdescLeft"> </td><td class="mdescRight">The average length of a document in the collection. <br /></td></tr>
<tr class="separator:aac08743bb731357a46f58bc1c9dd8739"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4e8361381e8111e5c0936bef91637d20"><td class="memItemLeft" align="right" valign="top"><a id="a4e8361381e8111e5c0936bef91637d20"></a>
<a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a4e8361381e8111e5c0936bef91637d20">get_termfreq</a> () const</td></tr>
<tr class="memdesc:a4e8361381e8111e5c0936bef91637d20"><td class="mdescLeft"> </td><td class="mdescRight">The number of documents which this term indexes. <br /></td></tr>
<tr class="separator:a4e8361381e8111e5c0936bef91637d20"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a31d2eb808f1d13419c5148b334cdb702"><td class="memItemLeft" align="right" valign="top"><a id="a31d2eb808f1d13419c5148b334cdb702"></a>
<a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a31d2eb808f1d13419c5148b334cdb702">get_reltermfreq</a> () const</td></tr>
<tr class="memdesc:a31d2eb808f1d13419c5148b334cdb702"><td class="mdescLeft"> </td><td class="mdescRight">The number of relevant documents which this term indexes. <br /></td></tr>
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<tr class="memitem:a8b889fbca34923d6077b3d8e39d08cc9"><td class="memItemLeft" align="right" valign="top"><a id="a8b889fbca34923d6077b3d8e39d08cc9"></a>
<a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a8b889fbca34923d6077b3d8e39d08cc9">get_collection_freq</a> () const</td></tr>
<tr class="memdesc:a8b889fbca34923d6077b3d8e39d08cc9"><td class="mdescLeft"> </td><td class="mdescRight">The collection frequency of the term. <br /></td></tr>
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<tr class="memitem:a0b1a15b14be112f56d1fea7557b39484"><td class="memItemLeft" align="right" valign="top"><a id="a0b1a15b14be112f56d1fea7557b39484"></a>
<a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a0b1a15b14be112f56d1fea7557b39484">get_query_length</a> () const</td></tr>
<tr class="memdesc:a0b1a15b14be112f56d1fea7557b39484"><td class="mdescLeft"> </td><td class="mdescRight">The length of the query. <br /></td></tr>
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<a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a88dd563e37f13c30075159ad58682f88">get_wqf</a> () const</td></tr>
<tr class="memdesc:a88dd563e37f13c30075159ad58682f88"><td class="mdescLeft"> </td><td class="mdescRight">The within-query-frequency of this term. <br /></td></tr>
<tr class="separator:a88dd563e37f13c30075159ad58682f88"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad26c71f5932cf020463a6566df03baa9"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#ad26c71f5932cf020463a6566df03baa9">get_doclength_upper_bound</a> () const</td></tr>
<tr class="memdesc:ad26c71f5932cf020463a6566df03baa9"><td class="mdescLeft"> </td><td class="mdescRight">An upper bound on the maximum length of any document in the database. <a href="#ad26c71f5932cf020463a6566df03baa9">More...</a><br /></td></tr>
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<tr class="memitem:a206b260ee9e90ebc5cc8de6f8fd6e2c5"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#a206b260ee9e90ebc5cc8de6f8fd6e2c5">get_doclength_lower_bound</a> () const</td></tr>
<tr class="memdesc:a206b260ee9e90ebc5cc8de6f8fd6e2c5"><td class="mdescLeft"> </td><td class="mdescRight">A lower bound on the minimum length of any document in the database. <a href="#a206b260ee9e90ebc5cc8de6f8fd6e2c5">More...</a><br /></td></tr>
<tr class="separator:a206b260ee9e90ebc5cc8de6f8fd6e2c5"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aff00a44dc04eae5864de75f319889433"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1Weight.html#aff00a44dc04eae5864de75f319889433">get_wdf_upper_bound</a> () const</td></tr>
<tr class="memdesc:aff00a44dc04eae5864de75f319889433"><td class="mdescLeft"> </td><td class="mdescRight">An upper bound on the wdf of this term. <a href="#aff00a44dc04eae5864de75f319889433">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Abstract base class for weighting schemes. </p>
</div><h2 class="groupheader">Member Enumeration Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ae3c11f1d2d96a18e0eb9b9b31c5c5479">◆ </a></span>stat_flags</h2>
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<td class="memname">enum <a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479">Xapian::Weight::stat_flags</a></td>
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<p>Stats which the weighting scheme can use (see <em><a class="el" href="classXapian_1_1Weight.html#a77b1424d5f5a5b2d4848175979da6475" title="Tell Xapian that your subclass will want a particular statistic. ">need_stat()</a></em>). </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479abce4fe48f6f680644bd352acc937856e"></a>COLLECTION_SIZE </td><td class="fielddoc"><p>Number of documents in the collection. </p>
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<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479a632727fa617eec2dfa9ad19e6adcb926"></a>RSET_SIZE </td><td class="fielddoc"><p>Number of documents in the <a class="el" href="classXapian_1_1RSet.html" title="A relevance set (R-Set). ">RSet</a>. </p>
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<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479a5ce8ff7822abec06e0f5ac956d7b247e"></a>AVERAGE_LENGTH </td><td class="fielddoc"><p>Average length of documents in the collection. </p>
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<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479ab2b087be2c0ffd8a2ea214298156f99b"></a>TERMFREQ </td><td class="fielddoc"><p>How many documents the current term is in. </p>
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<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479afd0979b74a0cf07991edc4af31ed55be"></a>RELTERMFREQ </td><td class="fielddoc"><p>How many documents in the <a class="el" href="classXapian_1_1RSet.html" title="A relevance set (R-Set). ">RSet</a> the current term is in. </p>
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<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479a1a95530f6aa2ca909e4c1620aed8192b"></a>QUERY_LENGTH </td><td class="fielddoc"><p>Sum of wqf for terms in the query. </p>
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<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479ab383711f122cf1927e418dc94e8ed1a7"></a>WQF </td><td class="fielddoc"><p>Within-query-frequency of the current term. </p>
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<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479afe84a106f8ec14c79acdfc29d9378aa2"></a>WDF </td><td class="fielddoc"><p>Within-document-frequency of the current term in the current document. </p>
</td></tr>
<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479a92ac55fbe32f39c3b4cdcab135ac0722"></a>DOC_LENGTH </td><td class="fielddoc"><p>Length of the current document (sum wdf). </p>
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<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479ac9f88f7ca707347bcce2c1ad0abdf531"></a>DOC_LENGTH_MIN </td><td class="fielddoc"><p>Lower bound on (non-zero) document lengths. </p>
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<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479a8f07b317ab1fca84d17cab78aa412e37"></a>DOC_LENGTH_MAX </td><td class="fielddoc"><p>Upper bound on document lengths. </p>
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<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479abe608cc5dc83deef0f35c13a69aa15dc"></a>WDF_MAX </td><td class="fielddoc"><p>Upper bound on wdf. </p>
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<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479ad923b48160007ce82f9db96f4f44c700"></a>COLLECTION_FREQ </td><td class="fielddoc"><p>Sum of wdf over the whole collection for the current term. </p>
</td></tr>
<tr><td class="fieldname"><a id="ae3c11f1d2d96a18e0eb9b9b31c5c5479a429d945066f46ee1449e1be35f897bf2"></a>UNIQUE_TERMS </td><td class="fielddoc"><p>Number of unique terms in the current document. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a3181bb7619bd560a3a2c21ece3213ce0">◆ </a></span>type_smoothing</h2>
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<td class="memname">enum <a class="el" href="classXapian_1_1Weight.html#a3181bb7619bd560a3a2c21ece3213ce0">Xapian::Weight::type_smoothing</a></td>
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<p>Type of smoothing to use with the Language Model Weighting scheme. </p>
<p>Default is TWO_STAGE_SMOOTHING. </p>
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<h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#adcc0dd3e0c762597e89720043440a0bd">◆ </a></span>~Weight()</h2>
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<td class="memname">virtual Xapian::Weight::~Weight </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
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<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
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<p>Virtual destructor, because we have virtual methods. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#aa7acc105949dcb3b8b343a598dd01487">◆ </a></span>Weight()</h2>
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<td class="memname">Xapian::Weight::Weight </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classXapian_1_1Weight.html">Weight</a> & </td>
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<p>Don't allow copying. </p>
<p>This would ideally be private, but that causes a compilation error with GCC 4.1 (which appears to be a bug). </p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a5663bb152f93f08dcc07e0b4a39ddbc3">◆ </a></span>clone()</h2>
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<td class="memname">virtual <a class="el" href="classXapian_1_1Weight.html">Weight</a>* Xapian::Weight::clone </td>
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<td class="paramname"></td><td>)</td>
<td> const</td>
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<p>Clone this object. </p>
<p>This method allocates and returns a copy of the object it is called on.</p>
<p>If your subclass is called FooWeight and has parameters a and b, then you would implement FooWeight::clone() like so:</p>
<p>FooWeight * FooWeight::clone() const { return new FooWeight(a, b); }</p>
<p>Note that the returned object will be deallocated by <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> after use with "delete". If you want to handle the deletion in a special way (for example when wrapping the <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> API for use from another language) then you can define a static <code>operator delete</code> method in your subclass as shown here: <a href="https://trac.xapian.org/ticket/554#comment:1">https://trac.xapian.org/ticket/554#comment:1</a> </p>
<p>Implemented in <a class="el" href="classXapian_1_1CoordWeight.html#a99a730e8ca6645800cfef8d1f04ecba0">Xapian::CoordWeight</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a206b260ee9e90ebc5cc8de6f8fd6e2c5">◆ </a></span>get_doclength_lower_bound()</h2>
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<td class="memname"><a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> Xapian::Weight::get_doclength_lower_bound </td>
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<p>A lower bound on the minimum length of any document in the database. </p>
<p>This bound does not include any zero-length documents.</p>
<p>This should only be used by <a class="el" href="classXapian_1_1Weight.html#a791cd50a4ab7f2c4f1d9786433033d79" title="Return an upper bound on what get_sumpart() can return for any document. ">get_maxpart()</a> and <a class="el" href="classXapian_1_1Weight.html#a019d010275b6e8130a4c5c746fdf32a1" title="Return an upper bound on what get_sumextra() can return for any document. ">get_maxextra()</a>. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ad26c71f5932cf020463a6566df03baa9">◆ </a></span>get_doclength_upper_bound()</h2>
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<td class="memname"><a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> Xapian::Weight::get_doclength_upper_bound </td>
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<p>An upper bound on the maximum length of any document in the database. </p>
<p>This should only be used by <a class="el" href="classXapian_1_1Weight.html#a791cd50a4ab7f2c4f1d9786433033d79" title="Return an upper bound on what get_sumpart() can return for any document. ">get_maxpart()</a> and <a class="el" href="classXapian_1_1Weight.html#a019d010275b6e8130a4c5c746fdf32a1" title="Return an upper bound on what get_sumextra() can return for any document. ">get_maxextra()</a>. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a019d010275b6e8130a4c5c746fdf32a1">◆ </a></span>get_maxextra()</h2>
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<td class="memname">virtual double Xapian::Weight::get_maxextra </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
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<p>Return an upper bound on what <a class="el" href="classXapian_1_1Weight.html#a77d87bf5be452399b7c9f72f3b41e5c0" title="Calculate the term-independent weight component for a document. ">get_sumextra()</a> can return for any document. </p>
<p>This information is used by the matcher to perform various optimisations, so strive to make the bound as tight as possible. </p>
<p>Implemented in <a class="el" href="classXapian_1_1CoordWeight.html#a3acbd3b7059c49c9cc982b33a19025c4">Xapian::CoordWeight</a>, <a class="el" href="classXapian_1_1LMWeight.html#a5fc3fa43cd95a418ceefc7fa01f50d9b">Xapian::LMWeight</a>, <a class="el" href="classXapian_1_1DPHWeight.html#ad104f3cb046ee4e78f89f66a1712a526">Xapian::DPHWeight</a>, <a class="el" href="classXapian_1_1PL2PlusWeight.html#abdac1ec6592ba025c3636410757f2747">Xapian::PL2PlusWeight</a>, <a class="el" href="classXapian_1_1PL2Weight.html#a673779be517e69ed764e3906977f899e">Xapian::PL2Weight</a>, <a class="el" href="classXapian_1_1DLHWeight.html#a774a5fa1cae3c3213c2a9708880d26f4">Xapian::DLHWeight</a>, <a class="el" href="classXapian_1_1BB2Weight.html#af93fd924084e5f1114498217284e649d">Xapian::BB2Weight</a>, <a class="el" href="classXapian_1_1IneB2Weight.html#a545d4308063949cbe1d36435ae404c1a">Xapian::IneB2Weight</a>, <a class="el" href="classXapian_1_1IfB2Weight.html#a6864001e411a5ea55c7a1601f5edd515">Xapian::IfB2Weight</a>, <a class="el" href="classXapian_1_1InL2Weight.html#a8afee9cc8b6d72ec2d7d3175cb8f61ba">Xapian::InL2Weight</a>, <a class="el" href="classXapian_1_1TradWeight.html#ad4158b46dfba942d6c928d0c1fee5c3f">Xapian::TradWeight</a>, <a class="el" href="classXapian_1_1BM25PlusWeight.html#ab326326a2a50cc91e066ad83cdf507eb">Xapian::BM25PlusWeight</a>, <a class="el" href="classXapian_1_1BM25Weight.html#a80712e2dc49bd5669b20c86c52b47307">Xapian::BM25Weight</a>, <a class="el" href="classXapian_1_1TfIdfWeight.html#af0bb215e6e60a771066f20298cd2529c">Xapian::TfIdfWeight</a>, and <a class="el" href="classXapian_1_1BoolWeight.html#af3cab034200cdb7f410cef2a8bb5d9a0">Xapian::BoolWeight</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a791cd50a4ab7f2c4f1d9786433033d79">◆ </a></span>get_maxpart()</h2>
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<td class="memname">virtual double Xapian::Weight::get_maxpart </td>
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<p>Return an upper bound on what <a class="el" href="classXapian_1_1Weight.html#a6b60672542f4252fd000641a359107a1" title="Calculate the weight contribution for this object's term to a document. ">get_sumpart()</a> can return for any document. </p>
<p>This information is used by the matcher to perform various optimisations, so strive to make the bound as tight as possible. </p>
<p>Implemented in <a class="el" href="classXapian_1_1CoordWeight.html#ae1bffa1da1809b3d61c59ccca76b79d4">Xapian::CoordWeight</a>, <a class="el" href="classXapian_1_1LMWeight.html#a9247cd3ce88149f29841fdcf1744a2b1">Xapian::LMWeight</a>, <a class="el" href="classXapian_1_1DPHWeight.html#aa1109657e8096c2d42f623e3f10fa63b">Xapian::DPHWeight</a>, <a class="el" href="classXapian_1_1PL2PlusWeight.html#a35409d11a6f882f12255ba335e9c4261">Xapian::PL2PlusWeight</a>, <a class="el" href="classXapian_1_1PL2Weight.html#aed14b2badee8668e0d11b3d2702cf099">Xapian::PL2Weight</a>, <a class="el" href="classXapian_1_1DLHWeight.html#ac72efe80f1f498295004581083bbf805">Xapian::DLHWeight</a>, <a class="el" href="classXapian_1_1BB2Weight.html#a45de27d300acb87ebc33e87f579292f1">Xapian::BB2Weight</a>, <a class="el" href="classXapian_1_1IneB2Weight.html#a92e94b33703d0a19e04fc4d928900ef7">Xapian::IneB2Weight</a>, <a class="el" href="classXapian_1_1IfB2Weight.html#a8980831136104445cf4fb2f9b2500d5f">Xapian::IfB2Weight</a>, <a class="el" href="classXapian_1_1InL2Weight.html#a7b4efb816640a588718f62f15ed73c80">Xapian::InL2Weight</a>, <a class="el" href="classXapian_1_1TradWeight.html#a7279ea46b93f20519979559c040186b9">Xapian::TradWeight</a>, <a class="el" href="classXapian_1_1BM25PlusWeight.html#aa31188c0036ccaf9a0c00556a8dfb8bb">Xapian::BM25PlusWeight</a>, <a class="el" href="classXapian_1_1BM25Weight.html#a2e479a60835ed5242f70bb33b3822462">Xapian::BM25Weight</a>, <a class="el" href="classXapian_1_1TfIdfWeight.html#a361ae444e2b42d667a3fdd855926f3e3">Xapian::TfIdfWeight</a>, and <a class="el" href="classXapian_1_1BoolWeight.html#aedc104db9d7c80d9eea7da0c65bd8ff3">Xapian::BoolWeight</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a77d87bf5be452399b7c9f72f3b41e5c0">◆ </a></span>get_sumextra()</h2>
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<td class="memname">virtual double Xapian::Weight::get_sumextra </td>
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<td class="paramtype"><a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> </td>
<td class="paramname"><em>doclen</em>, </td>
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<td class="paramtype"><a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> </td>
<td class="paramname"><em>uniqterms</em> </td>
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<td>)</td>
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<p>Calculate the term-independent weight component for a document. </p>
<p>The parameter gives information about the document which may be used in the calculations:</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">doclen</td><td>The document's length (unnormalised). </td></tr>
<tr><td class="paramname">uniqterms</td><td>The number of unique terms in the document. </td></tr>
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<p>Implemented in <a class="el" href="classXapian_1_1CoordWeight.html#a4c4f09315989bf21fb7176929b10492d">Xapian::CoordWeight</a>, <a class="el" href="classXapian_1_1LMWeight.html#ab22425728aad1ffbf0d19a2d99064b92">Xapian::LMWeight</a>, <a class="el" href="classXapian_1_1DPHWeight.html#a579c1c159fbce83d0b83e45faede2d6f">Xapian::DPHWeight</a>, <a class="el" href="classXapian_1_1PL2PlusWeight.html#aacd38b642ea498b44310c8ac8d4cb3cf">Xapian::PL2PlusWeight</a>, <a class="el" href="classXapian_1_1PL2Weight.html#a0c829d93710e5b553778af942acdfe61">Xapian::PL2Weight</a>, <a class="el" href="classXapian_1_1DLHWeight.html#a066c237b703c4ede04722e389cca618b">Xapian::DLHWeight</a>, <a class="el" href="classXapian_1_1BB2Weight.html#acb066851e13883766cb3da7c7c5de06a">Xapian::BB2Weight</a>, <a class="el" href="classXapian_1_1IneB2Weight.html#a650e39a120fa64d76858fe9f38b43048">Xapian::IneB2Weight</a>, <a class="el" href="classXapian_1_1IfB2Weight.html#a564cbbd42dcae2666347d4871daa4a66">Xapian::IfB2Weight</a>, <a class="el" href="classXapian_1_1InL2Weight.html#a744ba9657c53fbf870c2c390fe9e5e7d">Xapian::InL2Weight</a>, <a class="el" href="classXapian_1_1TradWeight.html#a19ba54115378d41681ae590ce6781d0e">Xapian::TradWeight</a>, <a class="el" href="classXapian_1_1BM25PlusWeight.html#a61ead2c8f139895fc69c10f2c9952e59">Xapian::BM25PlusWeight</a>, <a class="el" href="classXapian_1_1BM25Weight.html#a25ce3f7cf862c6c1c80dbebe67c0024a">Xapian::BM25Weight</a>, <a class="el" href="classXapian_1_1TfIdfWeight.html#a07a0fc39ac9af19c9f4215c669a2b63e">Xapian::TfIdfWeight</a>, and <a class="el" href="classXapian_1_1BoolWeight.html#add3d75e416ae31f88759dabd1557fb3a">Xapian::BoolWeight</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a6b60672542f4252fd000641a359107a1">◆ </a></span>get_sumpart()</h2>
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<td class="memname">virtual double Xapian::Weight::get_sumpart </td>
<td>(</td>
<td class="paramtype"><a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> </td>
<td class="paramname"><em>wdf</em>, </td>
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<td class="paramtype"><a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> </td>
<td class="paramname"><em>doclen</em>, </td>
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<td class="paramtype"><a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> </td>
<td class="paramname"><em>uniqterms</em> </td>
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<p>Calculate the weight contribution for this object's term to a document. </p>
<p>The parameters give information about the document which may be used in the calculations:</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">wdf</td><td>The within document frequency of the term in the document. </td></tr>
<tr><td class="paramname">doclen</td><td>The document's length (unnormalised). </td></tr>
<tr><td class="paramname">uniqterms</td><td>Number of unique terms in the document (used for absolute smoothing). </td></tr>
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<p>Implemented in <a class="el" href="classXapian_1_1CoordWeight.html#a2506a943101414aebef65478215a8047">Xapian::CoordWeight</a>, <a class="el" href="classXapian_1_1LMWeight.html#a8553032ac2fc305eae51f50ad24718f9">Xapian::LMWeight</a>, <a class="el" href="classXapian_1_1DPHWeight.html#afa33e831a5a8ce061339e6ea22a7062a">Xapian::DPHWeight</a>, <a class="el" href="classXapian_1_1PL2PlusWeight.html#a9c26ec6866d3878d5f408bc9627799d8">Xapian::PL2PlusWeight</a>, <a class="el" href="classXapian_1_1PL2Weight.html#a855a9e7d2dc0ae05c7531ed5bf407040">Xapian::PL2Weight</a>, <a class="el" href="classXapian_1_1DLHWeight.html#a345ad4130fe166bbdfd98e4aaa9679c4">Xapian::DLHWeight</a>, <a class="el" href="classXapian_1_1BB2Weight.html#ac6ad79b696b1cead49ea988680bd8df9">Xapian::BB2Weight</a>, <a class="el" href="classXapian_1_1IneB2Weight.html#ad04017eddbe3216d75e3165d9a48a52d">Xapian::IneB2Weight</a>, <a class="el" href="classXapian_1_1IfB2Weight.html#a15e690a8a767a5710de54526fa0d7090">Xapian::IfB2Weight</a>, <a class="el" href="classXapian_1_1InL2Weight.html#a69d36f15a85dfe6a40b21ae61ebc0643">Xapian::InL2Weight</a>, <a class="el" href="classXapian_1_1TradWeight.html#a07873ee01829db7da83ec8cf407f2396">Xapian::TradWeight</a>, <a class="el" href="classXapian_1_1BM25PlusWeight.html#aa38b5f0fc4dbf45eb876ca3552dc7871">Xapian::BM25PlusWeight</a>, <a class="el" href="classXapian_1_1BM25Weight.html#a57c10e8b9da01ad043e5519b8f01f23f">Xapian::BM25Weight</a>, <a class="el" href="classXapian_1_1TfIdfWeight.html#af2f13bf691af0320cbb2047d4e590582">Xapian::TfIdfWeight</a>, and <a class="el" href="classXapian_1_1BoolWeight.html#a1d675d43eb085751e5f5b760a664a3ef">Xapian::BoolWeight</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aff00a44dc04eae5864de75f319889433">◆ </a></span>get_wdf_upper_bound()</h2>
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<td class="memname"><a class="el" href="namespaceXapian.html#a4464380f6fa0055b5f26b8d03ae170e2">Xapian::termcount</a> Xapian::Weight::get_wdf_upper_bound </td>
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<p>An upper bound on the wdf of this term. </p>
<p>This should only be used by <a class="el" href="classXapian_1_1Weight.html#a791cd50a4ab7f2c4f1d9786433033d79" title="Return an upper bound on what get_sumpart() can return for any document. ">get_maxpart()</a> and <a class="el" href="classXapian_1_1Weight.html#a019d010275b6e8130a4c5c746fdf32a1" title="Return an upper bound on what get_sumextra() can return for any document. ">get_maxextra()</a>. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a71cd77c24183e837313ec13d967ddf2c">◆ </a></span>init()</h2>
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<td class="memname">virtual void Xapian::Weight::init </td>
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<p>Allow the subclass to perform any initialisation it needs to. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">factor</td><td>Any scaling factor (e.g. from OP_SCALE_WEIGHT). If the <a class="el" href="classXapian_1_1Weight.html" title="Abstract base class for weighting schemes. ">Weight</a> object is for the term-independent weight supplied by <a class="el" href="classXapian_1_1Weight.html#a77d87bf5be452399b7c9f72f3b41e5c0" title="Calculate the term-independent weight component for a document. ">get_sumextra()</a>/get_maxextra(), then init(0.0) is called (starting from <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> 1.2.11 and 1.3.1 - earlier versions failed to call <a class="el" href="classXapian_1_1Weight.html#a71cd77c24183e837313ec13d967ddf2c" title="Allow the subclass to perform any initialisation it needs to. ">init()</a> for such <a class="el" href="classXapian_1_1Weight.html" title="Abstract base class for weighting schemes. ">Weight</a> objects). </td></tr>
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<p>Implemented in <a class="el" href="classXapian_1_1CoordWeight.html#a9be9a0bbf23d57dfc7c855ccb68f2bb5">Xapian::CoordWeight</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a6106970d1a1e9600c9b32cc6ec96bf6b">◆ </a></span>name()</h2>
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<td class="memname">virtual std::string Xapian::Weight::name </td>
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<p>Return the name of this weighting scheme. </p>
<p>This name is used by the remote backend. It is passed along with the serialised parameters to the remote server so that it knows which class to create.</p>
<p>Return the full namespace-qualified name of your class here - if your class is called FooWeight, return "FooWeight" from this method (<a class="el" href="classXapian_1_1BM25Weight.html" title="Xapian::Weight subclass implementing the BM25 probabilistic formula. ">Xapian::BM25Weight</a> returns "Xapian::BM25Weight" here).</p>
<p>If you don't want to support the remote backend, you can use the default implementation which simply returns an empty string. </p>
<p>Reimplemented in <a class="el" href="classXapian_1_1CoordWeight.html#ad2a7fe941bd121f8a0905fc48b3ad4fd">Xapian::CoordWeight</a>, <a class="el" href="classXapian_1_1LMWeight.html#ac8bf794fc17edcff5513f3e2237ab1bb">Xapian::LMWeight</a>, <a class="el" href="classXapian_1_1DPHWeight.html#ab54bc48dd09f0572cafe4f2c75910bcd">Xapian::DPHWeight</a>, <a class="el" href="classXapian_1_1PL2PlusWeight.html#ac86eb422d8b88370f1bb1be811d5819b">Xapian::PL2PlusWeight</a>, <a class="el" href="classXapian_1_1PL2Weight.html#a809de45e643525e2dfa2c3d2d1e762bf">Xapian::PL2Weight</a>, <a class="el" href="classXapian_1_1DLHWeight.html#a2b5c9ca06a1c5277922f86ffa42a187c">Xapian::DLHWeight</a>, <a class="el" href="classXapian_1_1BB2Weight.html#a1a0954b1b48b5ea02a84c502e3e72836">Xapian::BB2Weight</a>, <a class="el" href="classXapian_1_1IneB2Weight.html#a28df82b3ec592a2f5fcad53b5785893e">Xapian::IneB2Weight</a>, <a class="el" href="classXapian_1_1IfB2Weight.html#ae050e02675753f52b1fc34069897d7d8">Xapian::IfB2Weight</a>, <a class="el" href="classXapian_1_1InL2Weight.html#a67c270ec72766cda01d953de91b7a8f2">Xapian::InL2Weight</a>, <a class="el" href="classXapian_1_1TradWeight.html#a3a193ffd7b50d8552bc83f26d72c913c">Xapian::TradWeight</a>, <a class="el" href="classXapian_1_1BM25PlusWeight.html#a456922fa3c01a6dcdca7c2d283786141">Xapian::BM25PlusWeight</a>, <a class="el" href="classXapian_1_1BM25Weight.html#a99e5a062caae46af83dd184fc531fedd">Xapian::BM25Weight</a>, <a class="el" href="classXapian_1_1TfIdfWeight.html#a5e64d2e2341805c1e7370de67ddeceec">Xapian::TfIdfWeight</a>, and <a class="el" href="classXapian_1_1BoolWeight.html#ad3bdc683dd2bab7eba190b27177c154e">Xapian::BoolWeight</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a77b1424d5f5a5b2d4848175979da6475">◆ </a></span>need_stat()</h2>
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<td class="memname">void Xapian::Weight::need_stat </td>
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<td class="paramtype"><a class="el" href="classXapian_1_1Weight.html#ae3c11f1d2d96a18e0eb9b9b31c5c5479">stat_flags</a> </td>
<td class="paramname"><em>flag</em></td><td>)</td>
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<p>Tell <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> that your subclass will want a particular statistic. </p>
<p>Some of the statistics can be costly to fetch or calculate, so <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> needs to know which are actually going to be used. You should call <a class="el" href="classXapian_1_1Weight.html#a77b1424d5f5a5b2d4848175979da6475" title="Tell Xapian that your subclass will want a particular statistic. ">need_stat()</a> from your constructor for each such statistic.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">flag</td><td>The stat_flags value for a required statistic. </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a5162368a30a0fc10d69359665b5d8e0e">◆ </a></span>serialise()</h2>
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<td class="memname">virtual std::string Xapian::Weight::serialise </td>
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<p>Return this object's parameters serialised as a single string. </p>
<p>If you don't want to support the remote backend, you can use the default implementation which simply throws <a class="el" href="classXapian_1_1UnimplementedError.html" title="UnimplementedError indicates an attempt to use an unimplemented feature. ">Xapian::UnimplementedError</a>. </p>
<p>Reimplemented in <a class="el" href="classXapian_1_1CoordWeight.html#a83a93c1f2f564351d6441edd3fe9044d">Xapian::CoordWeight</a>, <a class="el" href="classXapian_1_1LMWeight.html#aee4755b8d116f0aa4272a06be9198738">Xapian::LMWeight</a>, <a class="el" href="classXapian_1_1DPHWeight.html#af3fb03e53a75b9432f06aa137e1cfe87">Xapian::DPHWeight</a>, <a class="el" href="classXapian_1_1PL2PlusWeight.html#ad898cc39b2e53afde6eacf229cfaa707">Xapian::PL2PlusWeight</a>, <a class="el" href="classXapian_1_1PL2Weight.html#a8060073fd9d314dbff9f18731b079f2e">Xapian::PL2Weight</a>, <a class="el" href="classXapian_1_1DLHWeight.html#aa46e4fbaa8c0c3761393e0a5e194ee48">Xapian::DLHWeight</a>, <a class="el" href="classXapian_1_1BB2Weight.html#a0e4b218afe0ea5da3347110ac11fc3f5">Xapian::BB2Weight</a>, <a class="el" href="classXapian_1_1IneB2Weight.html#a93a95a0e0cfd4129847b0c598ab7c744">Xapian::IneB2Weight</a>, <a class="el" href="classXapian_1_1IfB2Weight.html#a7518be701077144708e5c24b1ffa8923">Xapian::IfB2Weight</a>, <a class="el" href="classXapian_1_1InL2Weight.html#a91b19cd9fe25ddf7d147031f00f12313">Xapian::InL2Weight</a>, <a class="el" href="classXapian_1_1TradWeight.html#ab1c7d1f0a9277bad2b334def4fe21f83">Xapian::TradWeight</a>, <a class="el" href="classXapian_1_1BM25PlusWeight.html#a637b5ea25f921f36dfb8b36aafb407b4">Xapian::BM25PlusWeight</a>, <a class="el" href="classXapian_1_1BM25Weight.html#ab503b86e545c40ac97cf00c174770dd4">Xapian::BM25Weight</a>, <a class="el" href="classXapian_1_1TfIdfWeight.html#aa64d21f95f38fc19b49a7f6a5ac3cb95">Xapian::TfIdfWeight</a>, and <a class="el" href="classXapian_1_1BoolWeight.html#ab34268c0dffd820f89f65c556b94c159">Xapian::BoolWeight</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a61bf13e666fb72de2ccc150ce0c3310a">◆ </a></span>unserialise()</h2>
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<td class="memname">virtual <a class="el" href="classXapian_1_1Weight.html">Weight</a>* Xapian::Weight::unserialise </td>
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<p>Unserialise parameters. </p>
<p>This method unserialises parameters serialised by the <em><a class="el" href="classXapian_1_1Weight.html#a5162368a30a0fc10d69359665b5d8e0e" title="Return this object's parameters serialised as a single string. ">serialise()</a></em> method and allocates and returns a new object initialised with them.</p>
<p>If you don't want to support the remote backend, you can use the default implementation which simply throws <a class="el" href="classXapian_1_1UnimplementedError.html" title="UnimplementedError indicates an attempt to use an unimplemented feature. ">Xapian::UnimplementedError</a>.</p>
<p>Note that the returned object will be deallocated by <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> after use with "delete". If you want to handle the deletion in a special way (for example when wrapping the <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> API for use from another language) then you can define a static <code>operator delete</code> method in your subclass as shown here: <a href="https://trac.xapian.org/ticket/554#comment:1">https://trac.xapian.org/ticket/554#comment:1</a></p>
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<tr><td class="paramname">serialised</td><td>A string containing the serialised parameters. </td></tr>
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<p>Reimplemented in <a class="el" href="classXapian_1_1CoordWeight.html#acb749043fef63989b718303ded8eb5e4">Xapian::CoordWeight</a>, <a class="el" href="classXapian_1_1LMWeight.html#ab139806107e326f665b50bbd9820d02b">Xapian::LMWeight</a>, <a class="el" href="classXapian_1_1DPHWeight.html#ad489e634ccf070a167d62c4f91686080">Xapian::DPHWeight</a>, <a class="el" href="classXapian_1_1PL2PlusWeight.html#a706299a20d8dcc63b8f0f6704dafd5d5">Xapian::PL2PlusWeight</a>, <a class="el" href="classXapian_1_1PL2Weight.html#ae029f0cbf0852dcba18c18302c651b5e">Xapian::PL2Weight</a>, <a class="el" href="classXapian_1_1DLHWeight.html#ac36d872262863911bc967a15a7dfe276">Xapian::DLHWeight</a>, <a class="el" href="classXapian_1_1BB2Weight.html#a7e0493c347bbb7e1661daf5a88423f73">Xapian::BB2Weight</a>, <a class="el" href="classXapian_1_1IneB2Weight.html#a365ce6c8f05c7fb61c9f2eabcf87810d">Xapian::IneB2Weight</a>, <a class="el" href="classXapian_1_1IfB2Weight.html#a940faaf550ca090d8fdd742d063d9397">Xapian::IfB2Weight</a>, <a class="el" href="classXapian_1_1InL2Weight.html#a2657ece33c999fdc6e60cb8c28567a65">Xapian::InL2Weight</a>, <a class="el" href="classXapian_1_1TradWeight.html#a86b2a408c58a4a5a678273a553c1b0a1">Xapian::TradWeight</a>, <a class="el" href="classXapian_1_1BM25PlusWeight.html#a0ef93c4b2091371f9f6fa9e319943916">Xapian::BM25PlusWeight</a>, <a class="el" href="classXapian_1_1BM25Weight.html#a699c03da0b3bb4c0952f40119586ef3b">Xapian::BM25Weight</a>, <a class="el" href="classXapian_1_1TfIdfWeight.html#a1cf72daa110ca6c361a49f8a759b6e9e">Xapian::TfIdfWeight</a>, and <a class="el" href="classXapian_1_1BoolWeight.html#a6932677937b1a78d174aa48287d89d19">Xapian::BoolWeight</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>xapian/<a class="el" href="weight_8h.html">weight.h</a></li>
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Documentation for Xapian (version 1.4.3).<br>
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