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<title>Xapian: API Documentation: Xapian::ValuePostingSource 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_1ValuePostingSource.html">ValuePostingSource</a></li> </ul>
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<div class="title">Xapian::ValuePostingSource Class Reference</div> </div>
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<p>A posting source which generates weights from a value slot.
<a href="classXapian_1_1ValuePostingSource.html#details">More...</a></p>
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<img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for Xapian::ValuePostingSource:</div>
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<area shape="rect" id="node4" href="classXapian_1_1LatLongDistancePostingSource.html" title="Posting source which returns a weight based on geospatial distance. " alt="" coords="623,5,835,47"/>
<area shape="rect" id="node5" href="classXapian_1_1ValueMapPostingSource.html" title="A posting source which looks up weights in a map using values as the key. " alt="" coords="623,71,836,98"/>
<area shape="rect" id="node6" href="classXapian_1_1ValueWeightPostingSource.html" title="A posting source which reads weights from a value slot. " alt="" coords="635,123,823,164"/>
<area shape="rect" id="node2" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. " alt="" coords="184,71,339,98"/>
<area shape="rect" id="node7" href="classXapian_1_1DecreasingValueWeightPostingSource.html" title="Read weights from a value which is known to decrease as docid increases. " alt="" coords="884,123,1095,164"/>
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<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:accbffc6b7f573e9a41fc234a410a1ec3"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#accbffc6b7f573e9a41fc234a410a1ec3">ValuePostingSource</a> (<a class="el" href="namespaceXapian.html#a94a899651fa920c72ffa9635bde630ea">Xapian::valueno</a> slot_)</td></tr>
<tr class="memdesc:accbffc6b7f573e9a41fc234a410a1ec3"><td class="mdescLeft"> </td><td class="mdescRight">Construct a <a class="el" href="classXapian_1_1ValuePostingSource.html" title="A posting source which generates weights from a value slot. ">ValuePostingSource</a>. <a href="#accbffc6b7f573e9a41fc234a410a1ec3">More...</a><br /></td></tr>
<tr class="separator:accbffc6b7f573e9a41fc234a410a1ec3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa952a93fa1c80f8f8ee5b7e59b87d147"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#aa952a93fa1c80f8f8ee5b7e59b87d147">get_termfreq_min</a> () const</td></tr>
<tr class="memdesc:aa952a93fa1c80f8f8ee5b7e59b87d147"><td class="mdescLeft"> </td><td class="mdescRight">A lower bound on the number of documents this object can return. <a href="#aa952a93fa1c80f8f8ee5b7e59b87d147">More...</a><br /></td></tr>
<tr class="separator:aa952a93fa1c80f8f8ee5b7e59b87d147"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a518d58643220e417e9affda5170b1096"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a518d58643220e417e9affda5170b1096">get_termfreq_est</a> () const</td></tr>
<tr class="memdesc:a518d58643220e417e9affda5170b1096"><td class="mdescLeft"> </td><td class="mdescRight">An estimate of the number of documents this object can return. <a href="#a518d58643220e417e9affda5170b1096">More...</a><br /></td></tr>
<tr class="separator:a518d58643220e417e9affda5170b1096"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5264a143aef0e447260adc70ce225a43"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a5264a143aef0e447260adc70ce225a43">get_termfreq_max</a> () const</td></tr>
<tr class="memdesc:a5264a143aef0e447260adc70ce225a43"><td class="mdescLeft"> </td><td class="mdescRight">An upper bound on the number of documents this object can return. <a href="#a5264a143aef0e447260adc70ce225a43">More...</a><br /></td></tr>
<tr class="separator:a5264a143aef0e447260adc70ce225a43"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a560f89bad687164dd139f9025d2bb1db"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a560f89bad687164dd139f9025d2bb1db">next</a> (double min_wt)</td></tr>
<tr class="memdesc:a560f89bad687164dd139f9025d2bb1db"><td class="mdescLeft"> </td><td class="mdescRight">Advance the current position to the next matching document. <a href="#a560f89bad687164dd139f9025d2bb1db">More...</a><br /></td></tr>
<tr class="separator:a560f89bad687164dd139f9025d2bb1db"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a27b5b12089a98975ad29bbcd0922556e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e">skip_to</a> (<a class="el" href="namespaceXapian.html#ad8f7a78bc920532b7d2baa3281b33e2f">Xapian::docid</a> min_docid, double min_wt)</td></tr>
<tr class="memdesc:a27b5b12089a98975ad29bbcd0922556e"><td class="mdescLeft"> </td><td class="mdescRight">Advance to the specified docid. <a href="#a27b5b12089a98975ad29bbcd0922556e">More...</a><br /></td></tr>
<tr class="separator:a27b5b12089a98975ad29bbcd0922556e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab222fd63a80cb7c329b8ab4cc27405b8"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#ab222fd63a80cb7c329b8ab4cc27405b8">check</a> (<a class="el" href="namespaceXapian.html#ad8f7a78bc920532b7d2baa3281b33e2f">Xapian::docid</a> min_docid, double min_wt)</td></tr>
<tr class="memdesc:ab222fd63a80cb7c329b8ab4cc27405b8"><td class="mdescLeft"> </td><td class="mdescRight">Check if the specified docid occurs. <a href="#ab222fd63a80cb7c329b8ab4cc27405b8">More...</a><br /></td></tr>
<tr class="separator:ab222fd63a80cb7c329b8ab4cc27405b8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a53d851ba1e75670c28c9508921273dc0"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a53d851ba1e75670c28c9508921273dc0">at_end</a> () const</td></tr>
<tr class="memdesc:a53d851ba1e75670c28c9508921273dc0"><td class="mdescLeft"> </td><td class="mdescRight">Return true if the current position is past the last entry in this list. <a href="#a53d851ba1e75670c28c9508921273dc0">More...</a><br /></td></tr>
<tr class="separator:a53d851ba1e75670c28c9508921273dc0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad9a4ca847b1a444a42f76ac7b1c27752"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#ad8f7a78bc920532b7d2baa3281b33e2f">Xapian::docid</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#ad9a4ca847b1a444a42f76ac7b1c27752">get_docid</a> () const</td></tr>
<tr class="memdesc:ad9a4ca847b1a444a42f76ac7b1c27752"><td class="mdescLeft"> </td><td class="mdescRight">Return the current docid. <a href="#ad9a4ca847b1a444a42f76ac7b1c27752">More...</a><br /></td></tr>
<tr class="separator:ad9a4ca847b1a444a42f76ac7b1c27752"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a764328b2a7085e24393a94eb1d2b91e0"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0">init</a> (const <a class="el" href="classXapian_1_1Database.html">Database</a> &db_)</td></tr>
<tr class="memdesc:a764328b2a7085e24393a94eb1d2b91e0"><td class="mdescLeft"> </td><td class="mdescRight">Set this <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> to the start of the list of postings. <a href="#a764328b2a7085e24393a94eb1d2b91e0">More...</a><br /></td></tr>
<tr class="separator:a764328b2a7085e24393a94eb1d2b91e0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6d4b124a53e83bfd2bcd3a5322273f57"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classXapian_1_1Database.html">Xapian::Database</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a6d4b124a53e83bfd2bcd3a5322273f57">get_database</a> () const</td></tr>
<tr class="memdesc:a6d4b124a53e83bfd2bcd3a5322273f57"><td class="mdescLeft"> </td><td class="mdescRight">The database we're reading values from. <a href="#a6d4b124a53e83bfd2bcd3a5322273f57">More...</a><br /></td></tr>
<tr class="separator:a6d4b124a53e83bfd2bcd3a5322273f57"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ae5245e693baae3871fc289af32637f15"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a94a899651fa920c72ffa9635bde630ea">Xapian::valueno</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#ae5245e693baae3871fc289af32637f15">get_slot</a> () const</td></tr>
<tr class="memdesc:ae5245e693baae3871fc289af32637f15"><td class="mdescLeft"> </td><td class="mdescRight">The slot we're reading values from. <a href="#ae5245e693baae3871fc289af32637f15">More...</a><br /></td></tr>
<tr class="separator:ae5245e693baae3871fc289af32637f15"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad64852538c6a36e3099ff75fe8d74ab3"><td class="memItemLeft" align="right" valign="top">std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#ad64852538c6a36e3099ff75fe8d74ab3">get_value</a> () const</td></tr>
<tr class="memdesc:ad64852538c6a36e3099ff75fe8d74ab3"><td class="mdescLeft"> </td><td class="mdescRight">Read current value. <a href="#ad64852538c6a36e3099ff75fe8d74ab3">More...</a><br /></td></tr>
<tr class="separator:ad64852538c6a36e3099ff75fe8d74ab3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aeae75a9b595b361b3e6c28be23048014"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#aeae75a9b595b361b3e6c28be23048014">done</a> ()</td></tr>
<tr class="memdesc:aeae75a9b595b361b3e6c28be23048014"><td class="mdescLeft"> </td><td class="mdescRight">End the iteration. <a href="#aeae75a9b595b361b3e6c28be23048014">More...</a><br /></td></tr>
<tr class="separator:aeae75a9b595b361b3e6c28be23048014"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8bb798e2c4cbc9184befb750410e7398"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a8bb798e2c4cbc9184befb750410e7398">get_started</a> () const</td></tr>
<tr class="memdesc:a8bb798e2c4cbc9184befb750410e7398"><td class="mdescLeft"> </td><td class="mdescRight">Flag indicating if we've started (true if we have). <a href="#a8bb798e2c4cbc9184befb750410e7398">More...</a><br /></td></tr>
<tr class="separator:a8bb798e2c4cbc9184befb750410e7398"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a32e275c815ab07a5e2c2fb02da9f1928"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a32e275c815ab07a5e2c2fb02da9f1928">set_termfreq_min</a> (<a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> termfreq_min_)</td></tr>
<tr class="memdesc:a32e275c815ab07a5e2c2fb02da9f1928"><td class="mdescLeft"> </td><td class="mdescRight">Set a lower bound on the term frequency. <a href="#a32e275c815ab07a5e2c2fb02da9f1928">More...</a><br /></td></tr>
<tr class="separator:a32e275c815ab07a5e2c2fb02da9f1928"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a7851aeed5774dbdd6b5692828730e3fc"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a7851aeed5774dbdd6b5692828730e3fc">set_termfreq_est</a> (<a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> termfreq_est_)</td></tr>
<tr class="memdesc:a7851aeed5774dbdd6b5692828730e3fc"><td class="mdescLeft"> </td><td class="mdescRight">An estimate of the term frequency. <a href="#a7851aeed5774dbdd6b5692828730e3fc">More...</a><br /></td></tr>
<tr class="separator:a7851aeed5774dbdd6b5692828730e3fc"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:acfdc1178868ae3600c3aeb291c450b32"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#acfdc1178868ae3600c3aeb291c450b32">set_termfreq_max</a> (<a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> termfreq_max_)</td></tr>
<tr class="memdesc:acfdc1178868ae3600c3aeb291c450b32"><td class="mdescLeft"> </td><td class="mdescRight">An upper bound on the term frequency. <a href="#acfdc1178868ae3600c3aeb291c450b32">More...</a><br /></td></tr>
<tr class="separator:acfdc1178868ae3600c3aeb291c450b32"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_classXapian_1_1PostingSource"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classXapian_1_1PostingSource')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="classXapian_1_1PostingSource.html">Xapian::PostingSource</a></td></tr>
<tr class="memitem:a82e85d6113d9c8e72cbbf4b3362f3fd6 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top"><a id="a82e85d6113d9c8e72cbbf4b3362f3fd6"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a82e85d6113d9c8e72cbbf4b3362f3fd6">PostingSource</a> ()</td></tr>
<tr class="memdesc:a82e85d6113d9c8e72cbbf4b3362f3fd6 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Allow subclasses to be instantiated. <br /></td></tr>
<tr class="separator:a82e85d6113d9c8e72cbbf4b3362f3fd6 inherit pub_methods_classXapian_1_1PostingSource"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a7201a6a189625b17f501561dcc3ea8a1 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a7201a6a189625b17f501561dcc3ea8a1">set_maxweight</a> (double max_weight)</td></tr>
<tr class="memdesc:a7201a6a189625b17f501561dcc3ea8a1 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Specify an upper bound on what <a class="el" href="classXapian_1_1PostingSource.html#a3922b7e3572eea6d3e39fc26cc7fed7a" title="Return the weight contribution for the current document. ">get_weight()</a> will return from now on. <a href="classXapian_1_1PostingSource.html#a7201a6a189625b17f501561dcc3ea8a1">More...</a><br /></td></tr>
<tr class="separator:a7201a6a189625b17f501561dcc3ea8a1 inherit pub_methods_classXapian_1_1PostingSource"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a1a447843283a8ef88b3d4662c97c87b4 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top"><a id="a1a447843283a8ef88b3d4662c97c87b4"></a>
double </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a1a447843283a8ef88b3d4662c97c87b4">get_maxweight</a> () const</td></tr>
<tr class="memdesc:a1a447843283a8ef88b3d4662c97c87b4 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Return the currently set upper bound on what <a class="el" href="classXapian_1_1PostingSource.html#a3922b7e3572eea6d3e39fc26cc7fed7a" title="Return the weight contribution for the current document. ">get_weight()</a> can return. <br /></td></tr>
<tr class="separator:a1a447843283a8ef88b3d4662c97c87b4 inherit pub_methods_classXapian_1_1PostingSource"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a3922b7e3572eea6d3e39fc26cc7fed7a inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a3922b7e3572eea6d3e39fc26cc7fed7a">get_weight</a> () const</td></tr>
<tr class="memdesc:a3922b7e3572eea6d3e39fc26cc7fed7a inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Return the weight contribution for the current document. <a href="classXapian_1_1PostingSource.html#a3922b7e3572eea6d3e39fc26cc7fed7a">More...</a><br /></td></tr>
<tr class="separator:a3922b7e3572eea6d3e39fc26cc7fed7a inherit pub_methods_classXapian_1_1PostingSource"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab41013bf3d3dc7d433430a69466b8582 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="classXapian_1_1PostingSource.html">PostingSource</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#ab41013bf3d3dc7d433430a69466b8582">clone</a> () const</td></tr>
<tr class="memdesc:ab41013bf3d3dc7d433430a69466b8582 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Clone the posting source. <a href="classXapian_1_1PostingSource.html#ab41013bf3d3dc7d433430a69466b8582">More...</a><br /></td></tr>
<tr class="separator:ab41013bf3d3dc7d433430a69466b8582 inherit pub_methods_classXapian_1_1PostingSource"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6cbbe96a7bb0d2a8c9de3d5d8b99675d inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top">virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a6cbbe96a7bb0d2a8c9de3d5d8b99675d">name</a> () const</td></tr>
<tr class="memdesc:a6cbbe96a7bb0d2a8c9de3d5d8b99675d inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Name of the posting source class. <a href="classXapian_1_1PostingSource.html#a6cbbe96a7bb0d2a8c9de3d5d8b99675d">More...</a><br /></td></tr>
<tr class="separator:a6cbbe96a7bb0d2a8c9de3d5d8b99675d inherit pub_methods_classXapian_1_1PostingSource"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0ad6b98d6b5e79a37b7a1d7874725894 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top">virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a0ad6b98d6b5e79a37b7a1d7874725894">serialise</a> () const</td></tr>
<tr class="memdesc:a0ad6b98d6b5e79a37b7a1d7874725894 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Serialise object parameters into a string. <a href="classXapian_1_1PostingSource.html#a0ad6b98d6b5e79a37b7a1d7874725894">More...</a><br /></td></tr>
<tr class="separator:a0ad6b98d6b5e79a37b7a1d7874725894 inherit pub_methods_classXapian_1_1PostingSource"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6aa8602abb801a2a366a6328d36ba4a9 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="classXapian_1_1PostingSource.html">PostingSource</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a6aa8602abb801a2a366a6328d36ba4a9">unserialise</a> (const std::string &serialised) const</td></tr>
<tr class="memdesc:a6aa8602abb801a2a366a6328d36ba4a9 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Create object given string serialisation returned by <a class="el" href="classXapian_1_1PostingSource.html#a0ad6b98d6b5e79a37b7a1d7874725894" title="Serialise object parameters into a string. ">serialise()</a>. <a href="classXapian_1_1PostingSource.html#a6aa8602abb801a2a366a6328d36ba4a9">More...</a><br /></td></tr>
<tr class="separator:a6aa8602abb801a2a366a6328d36ba4a9 inherit pub_methods_classXapian_1_1PostingSource"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4cadf2ff56f9e456e1f5a6b684cdb128 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="classXapian_1_1PostingSource.html">PostingSource</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a4cadf2ff56f9e456e1f5a6b684cdb128">unserialise_with_registry</a> (const std::string &serialised, const <a class="el" href="classXapian_1_1Registry.html">Registry</a> &registry) const</td></tr>
<tr class="memdesc:a4cadf2ff56f9e456e1f5a6b684cdb128 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Create object given string serialisation returned by <a class="el" href="classXapian_1_1PostingSource.html#a0ad6b98d6b5e79a37b7a1d7874725894" title="Serialise object parameters into a string. ">serialise()</a>. <a href="classXapian_1_1PostingSource.html#a4cadf2ff56f9e456e1f5a6b684cdb128">More...</a><br /></td></tr>
<tr class="separator:a4cadf2ff56f9e456e1f5a6b684cdb128 inherit pub_methods_classXapian_1_1PostingSource"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8a619b261e7d9db7cb7ccef9869afac8 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top">virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a8a619b261e7d9db7cb7ccef9869afac8">get_description</a> () const</td></tr>
<tr class="memdesc:a8a619b261e7d9db7cb7ccef9869afac8 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Return a string describing this object. <a href="classXapian_1_1PostingSource.html#a8a619b261e7d9db7cb7ccef9869afac8">More...</a><br /></td></tr>
<tr class="separator:a8a619b261e7d9db7cb7ccef9869afac8 inherit pub_methods_classXapian_1_1PostingSource"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a24d51135b279b59bccb37d42bc2062f1 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classXapian_1_1PostingSource.html">PostingSource</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a24d51135b279b59bccb37d42bc2062f1">release</a> ()</td></tr>
<tr class="memdesc:a24d51135b279b59bccb37d42bc2062f1 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Start reference counting this object. <a href="classXapian_1_1PostingSource.html#a24d51135b279b59bccb37d42bc2062f1">More...</a><br /></td></tr>
<tr class="separator:a24d51135b279b59bccb37d42bc2062f1 inherit pub_methods_classXapian_1_1PostingSource"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a15a62840bd29a630b8641722c2b8cbf8 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classXapian_1_1PostingSource.html">PostingSource</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a15a62840bd29a630b8641722c2b8cbf8">release</a> () const</td></tr>
<tr class="memdesc:a15a62840bd29a630b8641722c2b8cbf8 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Start reference counting this object. <a href="classXapian_1_1PostingSource.html#a15a62840bd29a630b8641722c2b8cbf8">More...</a><br /></td></tr>
<tr class="separator:a15a62840bd29a630b8641722c2b8cbf8 inherit pub_methods_classXapian_1_1PostingSource"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-attribs"></a>
Protected Attributes</h2></td></tr>
<tr class="memitem:a3bbef981fa3fac528dfee36248e55f44"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classXapian_1_1Database.html">Xapian::Database</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a3bbef981fa3fac528dfee36248e55f44">db</a></td></tr>
<tr class="memdesc:a3bbef981fa3fac528dfee36248e55f44"><td class="mdescLeft"> </td><td class="mdescRight">The database we're reading values from. <a href="#a3bbef981fa3fac528dfee36248e55f44">More...</a><br /></td></tr>
<tr class="separator:a3bbef981fa3fac528dfee36248e55f44"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ac6102f72ea311d470d083859838bf9d8"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a94a899651fa920c72ffa9635bde630ea">Xapian::valueno</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#ac6102f72ea311d470d083859838bf9d8">slot</a></td></tr>
<tr class="memdesc:ac6102f72ea311d470d083859838bf9d8"><td class="mdescLeft"> </td><td class="mdescRight">The slot we're reading values from. <a href="#ac6102f72ea311d470d083859838bf9d8">More...</a><br /></td></tr>
<tr class="separator:ac6102f72ea311d470d083859838bf9d8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a650c27f6c7891bb2e0f4d96c6f743e04"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classXapian_1_1ValueIterator.html">Xapian::ValueIterator</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a650c27f6c7891bb2e0f4d96c6f743e04">value_it</a></td></tr>
<tr class="memdesc:a650c27f6c7891bb2e0f4d96c6f743e04"><td class="mdescLeft"> </td><td class="mdescRight">Value stream iterator. <a href="#a650c27f6c7891bb2e0f4d96c6f743e04">More...</a><br /></td></tr>
<tr class="separator:a650c27f6c7891bb2e0f4d96c6f743e04"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:adc20089597b9ff9993526bd95d2fb653"><td class="memItemLeft" align="right" valign="top">bool & </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#adc20089597b9ff9993526bd95d2fb653">started</a></td></tr>
<tr class="memdesc:adc20089597b9ff9993526bd95d2fb653"><td class="mdescLeft"> </td><td class="mdescRight">Flag indicating if we've started (true if we have). <a href="#adc20089597b9ff9993526bd95d2fb653">More...</a><br /></td></tr>
<tr class="separator:adc20089597b9ff9993526bd95d2fb653"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad04e70cdc505898beef5911130322746"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#ad04e70cdc505898beef5911130322746">termfreq_min</a></td></tr>
<tr class="memdesc:ad04e70cdc505898beef5911130322746"><td class="mdescLeft"> </td><td class="mdescRight">A lower bound on the term frequency. <a href="#ad04e70cdc505898beef5911130322746">More...</a><br /></td></tr>
<tr class="separator:ad04e70cdc505898beef5911130322746"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a3bcadb7f9aace4bf1b577b4318451df2"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a3bcadb7f9aace4bf1b577b4318451df2">termfreq_est</a></td></tr>
<tr class="memdesc:a3bcadb7f9aace4bf1b577b4318451df2"><td class="mdescLeft"> </td><td class="mdescRight">An estimate of the term frequency. <a href="#a3bcadb7f9aace4bf1b577b4318451df2">More...</a><br /></td></tr>
<tr class="separator:a3bcadb7f9aace4bf1b577b4318451df2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a897f7b589182ce1ca88ed027570b2d4e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1ValuePostingSource.html#a897f7b589182ce1ca88ed027570b2d4e">termfreq_max</a></td></tr>
<tr class="memdesc:a897f7b589182ce1ca88ed027570b2d4e"><td class="mdescLeft"> </td><td class="mdescRight">An upper bound on the term frequency. <a href="#a897f7b589182ce1ca88ed027570b2d4e">More...</a><br /></td></tr>
<tr class="separator:a897f7b589182ce1ca88ed027570b2d4e"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A posting source which generates weights from a value slot. </p>
<p>This is a base class for classes which generate weights using values stored in the specified slot. For example, <a class="el" href="classXapian_1_1ValueWeightPostingSource.html" title="A posting source which reads weights from a value slot. ">ValueWeightPostingSource</a> uses sortable_unserialise to convert values directly to weights.</p>
<p>The upper bound on the weight returned is set to DBL_MAX. Subclasses should call <a class="el" href="classXapian_1_1PostingSource.html#a7201a6a189625b17f501561dcc3ea8a1" title="Specify an upper bound on what get_weight() will return from now on. ">set_maxweight()</a> in their <a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0" title="Set this PostingSource to the start of the list of postings. ">init()</a> methods after calling <a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0" title="Set this PostingSource to the start of the list of postings. ">ValuePostingSource::init()</a> if they know a tighter bound on the weight. </p>
</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#accbffc6b7f573e9a41fc234a410a1ec3">◆ </a></span>ValuePostingSource()</h2>
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<td class="memname">Xapian::ValuePostingSource::ValuePostingSource </td>
<td>(</td>
<td class="paramtype"><a class="el" href="namespaceXapian.html#a94a899651fa920c72ffa9635bde630ea">Xapian::valueno</a> </td>
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<p>Construct a <a class="el" href="classXapian_1_1ValuePostingSource.html" title="A posting source which generates weights from a value slot. ">ValuePostingSource</a>. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">slot_</td><td>The value slot to read values from. </td></tr>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a53d851ba1e75670c28c9508921273dc0">◆ </a></span>at_end()</h2>
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<td class="memname">bool Xapian::ValuePostingSource::at_end </td>
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<p>Return true if the current position is past the last entry in this list. </p>
<p>At least one of <em><a class="el" href="classXapian_1_1ValuePostingSource.html#a560f89bad687164dd139f9025d2bb1db" title="Advance the current position to the next matching document. ">next()</a></em>, <em><a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e" title="Advance to the specified docid. ">skip_to()</a></em> or <em><a class="el" href="classXapian_1_1ValuePostingSource.html#ab222fd63a80cb7c329b8ab4cc27405b8" title="Check if the specified docid occurs. ">check()</a></em> will be called before this method is first called. </p>
<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a98831c9fdea1599f588cd9fef51bbeb5">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ab222fd63a80cb7c329b8ab4cc27405b8">◆ </a></span>check()</h2>
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<td class="memname">bool Xapian::ValuePostingSource::check </td>
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<td class="paramtype"><a class="el" href="namespaceXapian.html#ad8f7a78bc920532b7d2baa3281b33e2f">Xapian::docid</a> </td>
<td class="paramname"><em>did</em>, </td>
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<td class="paramtype">double </td>
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<p>Check if the specified docid occurs. </p>
<p>The caller is required to ensure that the specified document id <em>did</em> actually exists in the database. If it does, it must move to that document id, and return true. If it does not, it may either:</p>
<ul>
<li>return true, having moved to a definite position (including "at_end"), which must be the same position as <a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e" title="Advance to the specified docid. ">skip_to()</a> would have moved to.</li>
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<p>or</p>
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<li>return false, having moved to an "indeterminate" position, such that a subsequent call to <a class="el" href="classXapian_1_1ValuePostingSource.html#a560f89bad687164dd139f9025d2bb1db" title="Advance the current position to the next matching document. ">next()</a> or <a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e" title="Advance to the specified docid. ">skip_to()</a> will move to the next matching position after <em>did</em>.</li>
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<p>Generally, this method should act like <a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e" title="Advance to the specified docid. ">skip_to()</a> and return true if that can be done at little extra cost.</p>
<p>Otherwise it should simply check if a particular docid is present, returning true if it is, and false if it isn't.</p>
<p>The default implementation calls <a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e" title="Advance to the specified docid. ">skip_to()</a> and always returns true.</p>
<p><a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time.</p>
<p>Note: in the case of a multi-database search, the docid specified is the docid in the single subdatabase relevant to this posting source. See the <em><a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0" title="Set this PostingSource to the start of the list of postings. ">init()</a></em> method for details.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">did</td><td>The document id to check. </td></tr>
<tr><td class="paramname">min_wt</td><td>The minimum weight contribution that is needed (this is just a hint which subclasses may ignore). </td></tr>
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<p>Reimplemented from <a class="el" href="classXapian_1_1PostingSource.html#a964696f90b6485bf3c931ccf4546a273">Xapian::PostingSource</a>.</p>
<p>Reimplemented in <a class="el" href="classXapian_1_1DecreasingValueWeightPostingSource.html#a7e4738f89c9ff109acd8a6d6ed0e71c0">Xapian::DecreasingValueWeightPostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aeae75a9b595b361b3e6c28be23048014">◆ </a></span>done()</h2>
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<p>End the iteration. </p>
<p>Calls to <a class="el" href="classXapian_1_1ValuePostingSource.html#a53d851ba1e75670c28c9508921273dc0" title="Return true if the current position is past the last entry in this list. ">at_end()</a> will return true after calling this method.</p>
<p>Added in 1.2.23 and 1.3.5. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a6d4b124a53e83bfd2bcd3a5322273f57">◆ </a></span>get_database()</h2>
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<td class="memname"><a class="el" href="classXapian_1_1Database.html">Xapian::Database</a> Xapian::ValuePostingSource::get_database </td>
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<p>The database we're reading values from. </p>
<p>Added in 1.2.23 and 1.3.5. </p>
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<p>Return the current docid. </p>
<p>This method may assume that it will only be called when there is a "current document". See <em><a class="el" href="classXapian_1_1PostingSource.html#a3922b7e3572eea6d3e39fc26cc7fed7a" title="Return the weight contribution for the current document. ">get_weight()</a></em> for details.</p>
<p>Note: in the case of a multi-database search, the returned docid should be in the single subdatabase relevant to this posting source. See the <em><a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0" title="Set this PostingSource to the start of the list of postings. ">init()</a></em> method for details. </p>
<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a7b1bd1fcd07d69204f70155588ae544a">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ae5245e693baae3871fc289af32637f15">◆ </a></span>get_slot()</h2>
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<td class="memname"><a class="el" href="namespaceXapian.html#a94a899651fa920c72ffa9635bde630ea">Xapian::valueno</a> Xapian::ValuePostingSource::get_slot </td>
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<p>The slot we're reading values from. </p>
<p>Added in 1.2.23 and 1.3.5. </p>
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<p>Flag indicating if we've started (true if we have). </p>
<p>Added in 1.2.23 and 1.3.5. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a518d58643220e417e9affda5170b1096">◆ </a></span>get_termfreq_est()</h2>
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<td class="memname"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> Xapian::ValuePostingSource::get_termfreq_est </td>
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<p>An estimate of the number of documents this object can return. </p>
<p>It must always be true that:</p>
<p><a class="el" href="classXapian_1_1ValuePostingSource.html#aa952a93fa1c80f8f8ee5b7e59b87d147" title="A lower bound on the number of documents this object can return. ">get_termfreq_min()</a> <= <a class="el" href="classXapian_1_1ValuePostingSource.html#a518d58643220e417e9affda5170b1096" title="An estimate of the number of documents this object can return. ">get_termfreq_est()</a> <= <a class="el" href="classXapian_1_1ValuePostingSource.html#a5264a143aef0e447260adc70ce225a43" title="An upper bound on the number of documents this object can return. ">get_termfreq_max()</a></p>
<p><a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time. </p>
<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a0d67eda5783f82951d6c56ad7ff4205b">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a5264a143aef0e447260adc70ce225a43">◆ </a></span>get_termfreq_max()</h2>
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<p>An upper bound on the number of documents this object can return. </p>
<p><a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time. </p>
<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a17de27c84a052c51d62ad498151a4cab">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aa952a93fa1c80f8f8ee5b7e59b87d147">◆ </a></span>get_termfreq_min()</h2>
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<p>A lower bound on the number of documents this object can return. </p>
<p><a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time. </p>
<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a5ecf450314e8b266eb9c8fae78e141d3">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ad64852538c6a36e3099ff75fe8d74ab3">◆ </a></span>get_value()</h2>
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<p>Read current value. </p>
<p>Added in 1.2.23 and 1.3.5. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a764328b2a7085e24393a94eb1d2b91e0">◆ </a></span>init()</h2>
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<p>Set this <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> to the start of the list of postings. </p>
<p>This is called automatically by the matcher prior to each query being processed.</p>
<p>If a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> is used for multiple searches, <em><a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0" title="Set this PostingSource to the start of the list of postings. ">init()</a></em> will therefore be called multiple times, and must handle this by using the database passed in the most recent call.</p>
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<p>Note: in the case of a multi-database search, a separate <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> will be used for each database (the separate PostingSources will be obtained using <em><a class="el" href="classXapian_1_1PostingSource.html#ab41013bf3d3dc7d433430a69466b8582" title="Clone the posting source. ">clone()</a></em>), and each <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> will be passed one of the sub-databases as the <em>db</em> parameter here. The <em>db</em> parameter will therefore always refer to a single database. All docids passed to, or returned from, the <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> refer to docids in that single database, rather than in the multi-database. </p>
<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a81d793170b496022488c15c3508979b5">Xapian::PostingSource</a>.</p>
<p>Reimplemented in <a class="el" href="classXapian_1_1ValueMapPostingSource.html#ae76de9cb534e96b7a0cc827d89eea8fc">Xapian::ValueMapPostingSource</a>, <a class="el" href="classXapian_1_1DecreasingValueWeightPostingSource.html#aabbd9d95d77e2aa947377c44d1bb733c">Xapian::DecreasingValueWeightPostingSource</a>, and <a class="el" href="classXapian_1_1ValueWeightPostingSource.html#ac3844351e28448d1de38fe089d626db4">Xapian::ValueWeightPostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a560f89bad687164dd139f9025d2bb1db">◆ </a></span>next()</h2>
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<td class="memname">void Xapian::ValuePostingSource::next </td>
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<td class="paramtype">double </td>
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<p>Advance the current position to the next matching document. </p>
<p>The <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> starts before the first entry in the list, so <a class="el" href="classXapian_1_1ValuePostingSource.html#a560f89bad687164dd139f9025d2bb1db" title="Advance the current position to the next matching document. ">next()</a> must be called before any methods which need the context of the current position.</p>
<p><a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">min_wt</td><td>The minimum weight contribution that is needed (this is just a hint which subclasses may ignore). </td></tr>
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<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a150c4c07ff4e959f448dd8cf840968e8">Xapian::PostingSource</a>.</p>
<p>Reimplemented in <a class="el" href="classXapian_1_1DecreasingValueWeightPostingSource.html#a6b4a3f76964292eb8a04d20059852f3b">Xapian::DecreasingValueWeightPostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a7851aeed5774dbdd6b5692828730e3fc">◆ </a></span>set_termfreq_est()</h2>
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<td class="memname">void Xapian::ValuePostingSource::set_termfreq_est </td>
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<td class="paramtype"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td>
<td class="paramname"><em>termfreq_est_</em></td><td>)</td>
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<p>An estimate of the term frequency. </p>
<p>Subclasses should set this if they are overriding the <a class="el" href="classXapian_1_1ValuePostingSource.html#a560f89bad687164dd139f9025d2bb1db" title="Advance the current position to the next matching document. ">next()</a>, <a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e" title="Advance to the specified docid. ">skip_to()</a> or <a class="el" href="classXapian_1_1ValuePostingSource.html#ab222fd63a80cb7c329b8ab4cc27405b8" title="Check if the specified docid occurs. ">check()</a> methods.</p>
<p>Added in 1.2.23 and 1.3.5. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#acfdc1178868ae3600c3aeb291c450b32">◆ </a></span>set_termfreq_max()</h2>
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<td class="memname">void Xapian::ValuePostingSource::set_termfreq_max </td>
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<td class="paramtype"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td>
<td class="paramname"><em>termfreq_max_</em></td><td>)</td>
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<p>An upper bound on the term frequency. </p>
<p>Subclasses should set this if they are overriding the <a class="el" href="classXapian_1_1ValuePostingSource.html#a560f89bad687164dd139f9025d2bb1db" title="Advance the current position to the next matching document. ">next()</a>, <a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e" title="Advance to the specified docid. ">skip_to()</a> or <a class="el" href="classXapian_1_1ValuePostingSource.html#ab222fd63a80cb7c329b8ab4cc27405b8" title="Check if the specified docid occurs. ">check()</a> methods.</p>
<p>Added in 1.2.23 and 1.3.5. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a32e275c815ab07a5e2c2fb02da9f1928">◆ </a></span>set_termfreq_min()</h2>
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<td class="memname">void Xapian::ValuePostingSource::set_termfreq_min </td>
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<td class="paramtype"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td>
<td class="paramname"><em>termfreq_min_</em></td><td>)</td>
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<p>Set a lower bound on the term frequency. </p>
<p>Subclasses should set this if they are overriding the <a class="el" href="classXapian_1_1ValuePostingSource.html#a560f89bad687164dd139f9025d2bb1db" title="Advance the current position to the next matching document. ">next()</a>, <a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e" title="Advance to the specified docid. ">skip_to()</a> or <a class="el" href="classXapian_1_1ValuePostingSource.html#ab222fd63a80cb7c329b8ab4cc27405b8" title="Check if the specified docid occurs. ">check()</a> methods to return fewer documents.</p>
<p>Added in 1.2.23 and 1.3.5. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a27b5b12089a98975ad29bbcd0922556e">◆ </a></span>skip_to()</h2>
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<td class="memname">void Xapian::ValuePostingSource::skip_to </td>
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<td class="paramtype"><a class="el" href="namespaceXapian.html#ad8f7a78bc920532b7d2baa3281b33e2f">Xapian::docid</a> </td>
<td class="paramname"><em>did</em>, </td>
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<p>Advance to the specified docid. </p>
<p>If the specified docid isn't in the list, position ourselves on the first document after it (or <a class="el" href="classXapian_1_1ValuePostingSource.html#a53d851ba1e75670c28c9508921273dc0" title="Return true if the current position is past the last entry in this list. ">at_end()</a> if no greater docids are present).</p>
<p>If the current position is already the specified docid, this method will leave the position unmodified.</p>
<p>If the specified docid is earlier than the current position, the behaviour is unspecified. A sensible behaviour would be to leave the current position unmodified, but it is also reasonable to move to the specified docid.</p>
<p>The default implementation calls <a class="el" href="classXapian_1_1ValuePostingSource.html#a560f89bad687164dd139f9025d2bb1db" title="Advance the current position to the next matching document. ">next()</a> repeatedly, which works but <a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e" title="Advance to the specified docid. ">skip_to()</a> can often be implemented much more efficiently.</p>
<p><a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time.</p>
<p>Note: in the case of a multi-database search, the docid specified is the docid in the single subdatabase relevant to this posting source. See the <em><a class="el" href="classXapian_1_1ValuePostingSource.html#a764328b2a7085e24393a94eb1d2b91e0" title="Set this PostingSource to the start of the list of postings. ">init()</a></em> method for details.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">did</td><td>The document id to advance to. </td></tr>
<tr><td class="paramname">min_wt</td><td>The minimum weight contribution that is needed (this is just a hint which subclasses may ignore). </td></tr>
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<p>Reimplemented from <a class="el" href="classXapian_1_1PostingSource.html#acf18a9328d8e46c3a759a3a120009607">Xapian::PostingSource</a>.</p>
<p>Reimplemented in <a class="el" href="classXapian_1_1DecreasingValueWeightPostingSource.html#aa70bb8128fa24aa8940bb518c9c01905">Xapian::DecreasingValueWeightPostingSource</a>.</p>
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<h2 class="groupheader">Member Data Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a3bbef981fa3fac528dfee36248e55f44">◆ </a></span>db</h2>
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<td class="memname"><a class="el" href="classXapian_1_1Database.html">Xapian::Database</a>& Xapian::ValuePostingSource::db</td>
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<p>The database we're reading values from. </p>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000004">Deprecated:</a></b></dt><dd>Use <em><a class="el" href="classXapian_1_1ValuePostingSource.html#a6d4b124a53e83bfd2bcd3a5322273f57" title="The database we're reading values from. ">get_database()</a></em> in preference. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ac6102f72ea311d470d083859838bf9d8">◆ </a></span>slot</h2>
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<td class="memname"><a class="el" href="namespaceXapian.html#a94a899651fa920c72ffa9635bde630ea">Xapian::valueno</a>& Xapian::ValuePostingSource::slot</td>
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<p>The slot we're reading values from. </p>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000005">Deprecated:</a></b></dt><dd>Use <em><a class="el" href="classXapian_1_1ValuePostingSource.html#ae5245e693baae3871fc289af32637f15" title="The slot we're reading values from. ">get_slot()</a></em> in preference. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#adc20089597b9ff9993526bd95d2fb653">◆ </a></span>started</h2>
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<td class="memname">bool& Xapian::ValuePostingSource::started</td>
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<p>Flag indicating if we've started (true if we have). </p>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000007">Deprecated:</a></b></dt><dd>Use <em><a class="el" href="classXapian_1_1ValuePostingSource.html#a8bb798e2c4cbc9184befb750410e7398" title="Flag indicating if we've started (true if we have). ">get_started()</a></em> in preference. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a3bcadb7f9aace4bf1b577b4318451df2">◆ </a></span>termfreq_est</h2>
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<td class="memname"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a>& Xapian::ValuePostingSource::termfreq_est</td>
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<p>An estimate of the term frequency. </p>
<p>Subclasses should set this if they are overriding the <a class="el" href="classXapian_1_1ValuePostingSource.html#a560f89bad687164dd139f9025d2bb1db" title="Advance the current position to the next matching document. ">next()</a>, <a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e" title="Advance to the specified docid. ">skip_to()</a> or <a class="el" href="classXapian_1_1ValuePostingSource.html#ab222fd63a80cb7c329b8ab4cc27405b8" title="Check if the specified docid occurs. ">check()</a> methods.</p>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000009">Deprecated:</a></b></dt><dd>Use <em><a class="el" href="classXapian_1_1ValuePostingSource.html#a7851aeed5774dbdd6b5692828730e3fc" title="An estimate of the term frequency. ">set_termfreq_est()</a></em> in preference. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a897f7b589182ce1ca88ed027570b2d4e">◆ </a></span>termfreq_max</h2>
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<td class="memname"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a>& Xapian::ValuePostingSource::termfreq_max</td>
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<p>An upper bound on the term frequency. </p>
<p>Subclasses should set this if they are overriding the <a class="el" href="classXapian_1_1ValuePostingSource.html#a560f89bad687164dd139f9025d2bb1db" title="Advance the current position to the next matching document. ">next()</a>, <a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e" title="Advance to the specified docid. ">skip_to()</a> or <a class="el" href="classXapian_1_1ValuePostingSource.html#ab222fd63a80cb7c329b8ab4cc27405b8" title="Check if the specified docid occurs. ">check()</a> methods.</p>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000010">Deprecated:</a></b></dt><dd>Use <em><a class="el" href="classXapian_1_1ValuePostingSource.html#acfdc1178868ae3600c3aeb291c450b32" title="An upper bound on the term frequency. ">set_termfreq_max()</a></em> in preference. </dd></dl>
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<p>A lower bound on the term frequency. </p>
<p>Subclasses should set this if they are overriding the <a class="el" href="classXapian_1_1ValuePostingSource.html#a560f89bad687164dd139f9025d2bb1db" title="Advance the current position to the next matching document. ">next()</a>, <a class="el" href="classXapian_1_1ValuePostingSource.html#a27b5b12089a98975ad29bbcd0922556e" title="Advance to the specified docid. ">skip_to()</a> or <a class="el" href="classXapian_1_1ValuePostingSource.html#ab222fd63a80cb7c329b8ab4cc27405b8" title="Check if the specified docid occurs. ">check()</a> methods to return fewer documents.</p>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000008">Deprecated:</a></b></dt><dd>Use <em><a class="el" href="classXapian_1_1ValuePostingSource.html#a32e275c815ab07a5e2c2fb02da9f1928" title="Set a lower bound on the term frequency. ">set_termfreq_min()</a></em> in preference. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a650c27f6c7891bb2e0f4d96c6f743e04">◆ </a></span>value_it</h2>
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<td class="memname"><a class="el" href="classXapian_1_1ValueIterator.html">Xapian::ValueIterator</a>& Xapian::ValuePostingSource::value_it</td>
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<p>Value stream iterator. </p>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000006">Deprecated:</a></b></dt><dd>Use <em><a class="el" href="classXapian_1_1ValuePostingSource.html#ad64852538c6a36e3099ff75fe8d74ab3" title="Read current value. ">get_value()</a></em> in preference to *value_it, and other methods of <a class="el" href="classXapian_1_1ValuePostingSource.html" title="A posting source which generates weights from a value slot. ">ValuePostingSource</a> in preference to calling methods of value_it. </dd></dl>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>xapian/<a class="el" href="postingsource_8h.html">postingsource.h</a></li>
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Documentation for Xapian (version 1.4.3).<br>
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<a href="http://www.doxygen.org/">Doxygen 1.8.13</a>.
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