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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>libinfinity-0.6 Reference Manual: InfAdoptedOperation</title>
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<div class="refentry">
<a name="InfAdoptedOperation"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="InfAdoptedOperation.top_of_page"></a>InfAdoptedOperation</span></h2>
<p>InfAdoptedOperation — Operation that can be processed by
<a class="link" href="InfAdoptedAlgorithm.html" title="InfAdoptedAlgorithm"><span class="type">InfAdoptedAlgorithm</span></a>.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="InfAdoptedOperation.stability-level"></a><h2>Stability Level</h2>
<a href="http://foldoc.org/Unstable"><span class="acronym">Unstable</span></a>, unless otherwise indicated
</div>
<div class="refsect1">
<a name="InfAdoptedOperation.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-need-concurrency-id" title="inf_adopted_operation_need_concurrency_id ()">inf_adopted_operation_need_concurrency_id</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="returnvalue">InfAdoptedOperation</span></a> *
</td>
<td class="function_name">
<a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-transform" title="inf_adopted_operation_transform ()">inf_adopted_operation_transform</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="returnvalue">InfAdoptedOperation</span></a> *
</td>
<td class="function_name">
<a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-copy" title="inf_adopted_operation_copy ()">inf_adopted_operation_copy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="InfAdoptedOperation.html#InfAdoptedOperationFlags" title="enum InfAdoptedOperationFlags"><span class="returnvalue">InfAdoptedOperationFlags</span></a>
</td>
<td class="function_name">
<a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-get-flags" title="inf_adopted_operation_get_flags ()">inf_adopted_operation_get_flags</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-apply" title="inf_adopted_operation_apply ()">inf_adopted_operation_apply</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="returnvalue">InfAdoptedOperation</span></a> *
</td>
<td class="function_name">
<a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-apply-transformed" title="inf_adopted_operation_apply_transformed ()">inf_adopted_operation_apply_transformed</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-is-reversible" title="inf_adopted_operation_is_reversible ()">inf_adopted_operation_is_reversible</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="returnvalue">InfAdoptedOperation</span></a> *
</td>
<td class="function_name">
<a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-revert" title="inf_adopted_operation_revert ()">inf_adopted_operation_revert</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="InfAdoptedOperation.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="InfAdoptedOperation.html#InfAdoptedOperation-struct" title="InfAdoptedOperation">InfAdoptedOperation</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="InfAdoptedOperation.html#InfAdoptedOperationIface" title="struct InfAdoptedOperationIface">InfAdoptedOperationIface</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="InfAdoptedOperation.html#InfAdoptedOperationFlags" title="enum InfAdoptedOperationFlags">InfAdoptedOperationFlags</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="InfAdoptedOperation.html#InfAdoptedConcurrencyId" title="enum InfAdoptedConcurrencyId">InfAdoptedConcurrencyId</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="InfAdoptedOperation.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    GEnum
    <span class="lineart">╰──</span> InfAdoptedConcurrencyId
    GFlags
    <span class="lineart">╰──</span> InfAdoptedOperationFlags
    GInterface
    <span class="lineart">╰──</span> InfAdoptedOperation
</pre>
</div>
<div class="refsect1">
<a name="InfAdoptedOperation.prerequisites"></a><h2>Prerequisites</h2>
<p>
InfAdoptedOperation requires
 GObject.</p>
</div>
<div class="refsect1">
<a name="InfAdoptedOperation.implementations"></a><h2>Known Implementations</h2>
<p>
InfAdoptedOperation is implemented by
 <a class="link" href="InfAdoptedNoOperation.html" title="InfAdoptedNoOperation">InfAdoptedNoOperation</a> and  <a class="link" href="InfAdoptedSplitOperation.html" title="InfAdoptedSplitOperation">InfAdoptedSplitOperation</a>.</p>
</div>
<div class="refsect1">
<a name="InfAdoptedOperation.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;libinfinity/adopted/inf-adopted-operation.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="InfAdoptedOperation.description"></a><h2>Description</h2>
<p>The <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> interface must be implemented by operations that
are supposed to be used by <a class="link" href="InfAdoptedAlgorithm.html" title="InfAdoptedAlgorithm"><span class="type">InfAdoptedAlgorithm</span></a>. They basically need to
define transformation rules for transformation against other operations.</p>
</div>
<div class="refsect1">
<a name="InfAdoptedOperation.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="inf-adopted-operation-need-concurrency-id"></a><h3>inf_adopted_operation_need_concurrency_id ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
inf_adopted_operation_need_concurrency_id
                               (<em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *operation</code></em>,
                                <em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *against</code></em>);</pre>
<p>This function returns whether transforming <em class="parameter"><code>operation</code></em>
 against <em class="parameter"><code>against</code></em>

is not defined unambiguously. In that case, transformation requires a
so-called concurrency ID which determines which of the two operations
is transformed.</p>
<div class="refsect3">
<a name="id-1.4.9.11.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>operation</p></td>
<td class="parameter_description"><p>The <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> to transform.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>against</p></td>
<td class="parameter_description"><p>The operation to transform against.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.9.11.2.6"></a><h4>Returns</h4>
<p> Whether transformation of <em class="parameter"><code>operation</code></em>
against <em class="parameter"><code>against</code></em>
requires a
concurrency ID to be defined.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="inf-adopted-operation-transform"></a><h3>inf_adopted_operation_transform ()</h3>
<pre class="programlisting"><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="returnvalue">InfAdoptedOperation</span></a> *
inf_adopted_operation_transform (<em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *operation</code></em>,
                                 <em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *against</code></em>,
                                 <em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *operation_lcs</code></em>,
                                 <em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *against_lcs</code></em>,
                                 <em class="parameter"><code><span class="type">gint</span> concurrency_id</code></em>);</pre>
<p>Performs an inclusion transformation of <em class="parameter"><code>operation</code></em>
 against <em class="parameter"><code>against</code></em>
,
meaning that the effect of <em class="parameter"><code>against</code></em>
 is included in <em class="parameter"><code>operation</code></em>
.</p>
<p>If <a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-need-concurrency-id" title="inf_adopted_operation_need_concurrency_id ()"><code class="function">inf_adopted_operation_need_concurrency_id()</code></a> returns <code class="literal">TRUE</code> for <em class="parameter"><code>operation</code></em>

and <em class="parameter"><code>against</code></em>
, then <em class="parameter"><code>operation_lcs</code></em>
 and <em class="parameter"><code>against_lcs</code></em>
 must not be <code class="literal">NULL</code>. In
this case they must be the same operations as <em class="parameter"><code>operation</code></em>
 and <em class="parameter"><code>against</code></em>
 at
the earlierst state to which both of them can be transformed. This
information can then be used to resolve any conflicts in the transformation
of <em class="parameter"><code>operation</code></em>
 against <em class="parameter"><code>against</code></em>
.</p>
<p>The <em class="parameter"><code>concurrency_id</code></em>
 parameter is used if
<a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-need-concurrency-id" title="inf_adopted_operation_need_concurrency_id ()"><code class="function">inf_adopted_operation_need_concurrency_id()</code></a> returns <code class="literal">TRUE</code> and no conflict
resolution can be deduced from <em class="parameter"><code>operation_lcs</code></em>
 and <em class="parameter"><code>against_lcs</code></em>
. In this
case <em class="parameter"><code>concurrency_id</code></em>
 defines a unique way to transform the two operations.
Usually, this is derived from the user IDs of the users who issued the two
conflicting operations.</p>
<div class="refsect3">
<a name="id-1.4.9.11.3.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>operation</p></td>
<td class="parameter_description"><p>The <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> to transform.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>against</p></td>
<td class="parameter_description"><p>The operation to transform against.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>operation_lcs</p></td>
<td class="parameter_description"><p>The operation at a previous state, or <code class="literal">NULL</code>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>against_lcs</p></td>
<td class="parameter_description"><p>The <em class="parameter"><code>against</code></em>
operation at a previous state, or <code class="literal">NULL</code>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>concurrency_id</p></td>
<td class="parameter_description"><p>The concurrency ID for the transformation.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.9.11.3.8"></a><h4>Returns</h4>
<p> The transformed <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a>, or <code class="literal">NULL</code> if the
transformation failed.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="inf-adopted-operation-copy"></a><h3>inf_adopted_operation_copy ()</h3>
<pre class="programlisting"><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="returnvalue">InfAdoptedOperation</span></a> *
inf_adopted_operation_copy (<em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *operation</code></em>);</pre>
<p>Returns a copy of <em class="parameter"><code>operation</code></em>
.</p>
<div class="refsect3">
<a name="id-1.4.9.11.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>operation</p></td>
<td class="parameter_description"><p>The <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> to copy.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.9.11.4.6"></a><h4>Returns</h4>
<p> A copy of <em class="parameter"><code>operation</code></em>
.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="inf-adopted-operation-get-flags"></a><h3>inf_adopted_operation_get_flags ()</h3>
<pre class="programlisting"><a class="link" href="InfAdoptedOperation.html#InfAdoptedOperationFlags" title="enum InfAdoptedOperationFlags"><span class="returnvalue">InfAdoptedOperationFlags</span></a>
inf_adopted_operation_get_flags (<em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *operation</code></em>);</pre>
<p>Returns the flags for <em class="parameter"><code>operation</code></em>
.</p>
<div class="refsect3">
<a name="id-1.4.9.11.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>operation</p></td>
<td class="parameter_description"><p>A <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.9.11.5.6"></a><h4>Returns</h4>
<p> <a class="link" href="InfAdoptedOperation.html#InfAdoptedOperationFlags" title="enum InfAdoptedOperationFlags"><span class="type">InfAdoptedOperationFlags</span></a> for <em class="parameter"><code>operation</code></em>
.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="inf-adopted-operation-apply"></a><h3>inf_adopted_operation_apply ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
inf_adopted_operation_apply (<em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *operation</code></em>,
                             <em class="parameter"><code><a class="link" href="InfAdoptedUser.html" title="InfAdoptedUser"><span class="type">InfAdoptedUser</span></a> *by</code></em>,
                             <em class="parameter"><code><a class="link" href="InfBuffer.html" title="InfBuffer"><span class="type">InfBuffer</span></a> *buffer</code></em>,
                             <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>Applies <em class="parameter"><code>operation</code></em>
 to <em class="parameter"><code>buffer</code></em>
. The operation is considered to be applied by
user <em class="parameter"><code>by</code></em>
. If the operation cannot be applied then <em class="parameter"><code>error</code></em>
 is set and the
function returns <code class="literal">FALSE</code>.</p>
<div class="refsect3">
<a name="id-1.4.9.11.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>operation</p></td>
<td class="parameter_description"><p>A <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>by</p></td>
<td class="parameter_description"><p>A <a class="link" href="InfAdoptedUser.html" title="InfAdoptedUser"><span class="type">InfAdoptedUser</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>The <a class="link" href="InfBuffer.html" title="InfBuffer"><span class="type">InfBuffer</span></a> to apply the operation to.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>Location to store error information, if any, or <code class="literal">NULL</code>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.9.11.6.6"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> on success or <code class="literal">FALSE</code> on error.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="inf-adopted-operation-apply-transformed"></a><h3>inf_adopted_operation_apply_transformed ()</h3>
<pre class="programlisting"><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="returnvalue">InfAdoptedOperation</span></a> *
inf_adopted_operation_apply_transformed
                               (<em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *operation</code></em>,
                                <em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *transformed</code></em>,
                                <em class="parameter"><code><a class="link" href="InfAdoptedUser.html" title="InfAdoptedUser"><span class="type">InfAdoptedUser</span></a> *by</code></em>,
                                <em class="parameter"><code><a class="link" href="InfBuffer.html" title="InfBuffer"><span class="type">InfBuffer</span></a> *buffer</code></em>,
                                <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>Applies <em class="parameter"><code>transformed</code></em>
 to <em class="parameter"><code>buffer</code></em>
. The operation is considered to be applied
by user <em class="parameter"><code>by</code></em>
. The operation <em class="parameter"><code>transformed</code></em>
 must have originated from
<em class="parameter"><code>operation</code></em>
 by transformation with <a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-transform" title="inf_adopted_operation_transform ()"><code class="function">inf_adopted_operation_transform()</code></a>.</p>
<p>If <em class="parameter"><code>operation</code></em>
 is reversible or does not affect the buffer (see
<a class="link" href="InfAdoptedOperation.html#InfAdoptedOperationFlags" title="enum InfAdoptedOperationFlags"><span class="type">InfAdoptedOperationFlags</span></a>), this function is equivalent to</p>
<code class="code">inf_adopted_operation_apply(transformed, by, buffer)</code>, with
<p>the exception of the return value. In that case the return value will be
<em class="parameter"><code>operation</code></em>
 itself, with a reference added.</p>
<p>However, if <em class="parameter"><code>operation</code></em>
 is not reversible and affects the buffer, the
function attempts to construct an operation which is identical to
<em class="parameter"><code>operation</code></em>
, but reversible, and returns it. The function can use
information from the transformed operation and the buffer to construct
the reversible operation. If a reversible operation cannot be constructed,
the function returns an additional reference on <em class="parameter"><code>operation</code></em>
, and still
applies the transformed operation
to the buffer.</p>
<p>For example, an operation that deletes text in a text editor would be
transmitting only the position and the length of the text to delete over
the network. From that information alone, the operation cannot be made
reversible. However, when the operation is applied to the buffer, the
actual text that is being removed can be restored by looking it up in
the buffer, making the operation reversible.</p>
<div class="refsect3">
<a name="id-1.4.9.11.7.10"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>operation</p></td>
<td class="parameter_description"><p>A <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>transformed</p></td>
<td class="parameter_description"><p>A transformed version of <em class="parameter"><code>operation</code></em>
.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>by</p></td>
<td class="parameter_description"><p>The <a class="link" href="InfAdoptedUser.html" title="InfAdoptedUser"><span class="type">InfAdoptedUser</span></a> applying the operation.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>The <a class="link" href="InfBuffer.html" title="InfBuffer"><span class="type">InfBuffer</span></a> to apply the operation to.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>Location to store error information, if any, or <code class="literal">NULL</code>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.9.11.7.11"></a><h4>Returns</h4>
<p> A <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a>, or <code class="literal">NULL</code> on error. Free with
<code class="function">g_object_unref()</code> when no longer needed.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="inf-adopted-operation-is-reversible"></a><h3>inf_adopted_operation_is_reversible ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
inf_adopted_operation_is_reversible (<em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *operation</code></em>);</pre>
<p>Returns whether <em class="parameter"><code>operation</code></em>
 is reversible.</p>
<div class="refsect3">
<a name="id-1.4.9.11.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>operation</p></td>
<td class="parameter_description"><p>A <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.9.11.8.6"></a><h4>Returns</h4>
<p> Whether <em class="parameter"><code>operation</code></em>
is reversible.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="inf-adopted-operation-revert"></a><h3>inf_adopted_operation_revert ()</h3>
<pre class="programlisting"><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="returnvalue">InfAdoptedOperation</span></a> *
inf_adopted_operation_revert (<em class="parameter"><code><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> *operation</code></em>);</pre>
<p>Returns a new <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> that undoes the effect of <em class="parameter"><code>operation</code></em>
. If
<em class="parameter"><code>operation</code></em>
 and then its reverse operation are applied to a buffer (in that
order), the buffer remains unchanged.</p>
<p><em class="parameter"><code>operation</code></em>
 must be reversible for this function to be called (i.e.
<a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-is-reversible" title="inf_adopted_operation_is_reversible ()"><code class="function">inf_adopted_operation_is_reversible()</code></a> must return TRUE).</p>
<div class="refsect3">
<a name="id-1.4.9.11.9.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>operation</p></td>
<td class="parameter_description"><p>A <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.9.11.9.7"></a><h4>Returns</h4>
<p> The reverse operation of <em class="parameter"><code>operation</code></em>
.</p>
<p></p>
</div>
</div>
</div>
<div class="refsect1">
<a name="InfAdoptedOperation.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="InfAdoptedOperation-struct"></a><h3>InfAdoptedOperation</h3>
<pre class="programlisting">typedef struct _InfAdoptedOperation InfAdoptedOperation;</pre>
<p><a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> is an opaque data type. You should only access it
via the public API functions.</p>
</div>
<hr>
<div class="refsect2">
<a name="InfAdoptedOperationIface"></a><h3>struct InfAdoptedOperationIface</h3>
<pre class="programlisting">struct InfAdoptedOperationIface {
  gboolean (*need_concurrency_id)(InfAdoptedOperation* operation,
                                  InfAdoptedOperation* against);

  InfAdoptedOperation* (*transform)(InfAdoptedOperation* operation,
                                    InfAdoptedOperation* against,
                                    InfAdoptedOperation* lcs_operation,
                                    InfAdoptedOperation* lcs_against,
                                    InfAdoptedConcurrencyId concurrency_id);

  InfAdoptedOperation* (*copy)(InfAdoptedOperation* operation);

  InfAdoptedOperationFlags (*get_flags)(InfAdoptedOperation* operation);

  gboolean (*apply)(InfAdoptedOperation* operation,
                    InfAdoptedUser* by,
                    InfBuffer* buffer,
                    GError** error);

  InfAdoptedOperation* (*apply_transformed)(InfAdoptedOperation* operation,
                                            InfAdoptedOperation* transformed,
                                            InfAdoptedUser* by,
                                            InfBuffer* buffer,
                                            GError** error);

  InfAdoptedOperation* (*revert)(InfAdoptedOperation* operation);
};
</pre>
<p>The virtual methods that need to be implemented by an operation to be used
with <a class="link" href="InfAdoptedAlgorithm.html" title="InfAdoptedAlgorithm"><span class="type">InfAdoptedAlgorithm</span></a>.</p>
<div class="refsect3">
<a name="id-1.4.9.12.3.5"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="InfAdoptedOperationIface.need-concurrency-id"></a>need_concurrency_id</code></em> ()</p></td>
<td class="struct_member_description"><p>Virtual function to determine whether a concurrency
ID is required to transform <em class="parameter"><code>operation</code></em>
against <em class="parameter"><code>against</code></em>
.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="InfAdoptedOperationIface.transform"></a>transform</code></em> ()</p></td>
<td class="struct_member_description"><p>Virtual function that transform <em class="parameter"><code>operation</code></em>
against <em class="parameter"><code>against</code></em>
and
returns a new <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a> as the result of the transformation.
<em class="parameter"><code>concurrency_id</code></em>
is either 1 or -1 and can be used to make a decision in
case there is no other criteria to decide how to do the transformation, for
example when both <em class="parameter"><code>operation</code></em>
and <em class="parameter"><code>against</code></em>
are inserting text at the same
position in the buffer.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="InfAdoptedOperationIface.copy"></a>copy</code></em> ()</p></td>
<td class="struct_member_description"><p>Virtual function that returns a copy of the operation.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="InfAdoptedOperationIface.get-flags"></a>get_flags</code></em> ()</p></td>
<td class="struct_member_description"><p>Virtual function that returns the flags of the operation,
see <a class="link" href="InfAdoptedOperation.html#InfAdoptedOperationFlags" title="enum InfAdoptedOperationFlags"><span class="type">InfAdoptedOperationFlags</span></a>.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="InfAdoptedOperationIface.apply"></a>apply</code></em> ()</p></td>
<td class="struct_member_description"><p>Virtual function that applies the operation to the buffer. <em class="parameter"><code>by</code></em>
is
the user that applies the operation.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="InfAdoptedOperationIface.apply-transformed"></a>apply_transformed</code></em> ()</p></td>
<td class="struct_member_description"><p>Virtual function that applies a transformed version
of the operation to the buffer. It attempts to use information from the
buffer to make the original operation reversible, if it is not already.
The implementation of this function is optional, and only needs to be
implemented if the operation is not reversible but can be made reversible
with additional information from the buffer or the transformed operation.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="InfAdoptedOperationIface.revert"></a>revert</code></em> ()</p></td>
<td class="struct_member_description"><p>Virtual function that creates a new operation that undoes the
effect of the operation. If <em class="parameter"><code>get_flags</code></em>
does never return the
<a class="link" href="InfAdoptedOperation.html#INF-ADOPTED-OPERATION-REVERSIBLE:CAPS"><code class="literal">INF_ADOPTED_OPERATION_REVERSIBLE</code></a> flag set, then this is allowed to be
<code class="literal">NULL</code>.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="InfAdoptedOperationFlags"></a><h3>enum InfAdoptedOperationFlags</h3>
<p>Various flags for <a class="link" href="InfAdoptedOperation.html" title="InfAdoptedOperation"><span class="type">InfAdoptedOperation</span></a>.</p>
<div class="refsect3">
<a name="id-1.4.9.12.4.4"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="INF-ADOPTED-OPERATION-AFFECTS-BUFFER:CAPS"></a>INF_ADOPTED_OPERATION_AFFECTS_BUFFER</p></td>
<td class="enum_member_description">
<p>The operation changes the content of
the buffer.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="INF-ADOPTED-OPERATION-REVERSIBLE:CAPS"></a>INF_ADOPTED_OPERATION_REVERSIBLE</p></td>
<td class="enum_member_description">
<p>The operation is reversible, which means
that <a class="link" href="InfAdoptedOperation.html#inf-adopted-operation-revert" title="inf_adopted_operation_revert ()"><code class="function">inf_adopted_operation_revert()</code></a> can be called to generate an operation
that undoes the effect of the operation.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="InfAdoptedConcurrencyId"></a><h3>enum InfAdoptedConcurrencyId</h3>
<p>A concurrency ID is used to determine which operation to transform in case
two similar operations are transformed against each other.</p>
<div class="refsect3">
<a name="id-1.4.9.12.5.4"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="INF-ADOPTED-CONCURRENCY-SELF:CAPS"></a>INF_ADOPTED_CONCURRENCY_SELF</p></td>
<td class="enum_member_description">
<p>Transform the operation itself.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="INF-ADOPTED-CONCURRENCY-NONE:CAPS"></a>INF_ADOPTED_CONCURRENCY_NONE</p></td>
<td class="enum_member_description">
<p>Unspecified which operation to transform.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="INF-ADOPTED-CONCURRENCY-OTHER:CAPS"></a>INF_ADOPTED_CONCURRENCY_OTHER</p></td>
<td class="enum_member_description">
<p>Transform the other operation.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="InfAdoptedOperation.see-also"></a><h2>See Also</h2>
<p><a class="link" href="InfAdoptedRequest.html" title="InfAdoptedRequest"><span class="type">InfAdoptedRequest</span></a>, <a class="link" href="InfAdoptedAlgorithm.html" title="InfAdoptedAlgorithm"><span class="type">InfAdoptedAlgorithm</span></a></p>
</div>
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