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<div class="title">Todo List </div> </div>
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<dt><a class="anchor" id="_todo000001"></a>Global <a class="el" href="group__mdb.html#gaf6dfd3df8c5c6f082c5befc585165747">MDB_rel_func</a> )(<a class="el" href="group__mdb.html#structMDB__val" title="Generic structure used for passing keys and data in and out of the database. ">MDB_val</a> *item, void *oldptr, void *newptr, void *relctx)</dt>
<dd>This feature is currently unimplemented. </dd>
<dt><a class="anchor" id="_todo000002"></a>Global <a class="el" href="group__internal.html#ga697d82c7afe79f142207ad5adcdebfeb">mdb_set_relfunc</a> (<a class="el" href="group__internal.html#structMDB__txn" title="Opaque structure for a transaction handle. ">MDB_txn</a> *txn, MDB_dbi dbi, MDB_rel_func *rel)</dt>
<dd>The relocation function is called whenever it is necessary to move the data of an item to a different position in the database (e.g. through tree balancing operations, shifts as a result of adds or deletes, etc.). It is intended to allow address/position-dependent data items to be stored in a database in an environment opened with the <a class="el" href="group__mdb__env.html#ga492952277c481bc4a6fa08ef71c29487">MDB_FIXEDMAP</a> option. Currently the relocation feature is unimplemented and setting this function has no effect. <dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">txn</td><td>A transaction handle returned by <a class="el" href="group__mdb.html#gad7ea55da06b77513609efebd44b26920" title="Create a transaction for use with the environment. ">mdb_txn_begin()</a> </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">dbi</td><td>A database handle returned by <a class="el" href="group__mdb.html#gac08cad5b096925642ca359a6d6f0562a" title="Open a database in the environment. ">mdb_dbi_open()</a> </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">rel</td><td>A <a class="el" href="group__mdb.html#gaf6dfd3df8c5c6f082c5befc585165747" title="A callback function used to relocate a position-dependent data item in a fixed-address database...">MDB_rel_func</a> function </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>A non-zero error value on failure and 0 on success. Some possible errors are: </dd></dl>
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