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+<a href="../session/intro.html"><h2>Session Module C Interface</h2></a><h2>Invert A Changeset</h2><blockquote><pre>int sqlite3changeset_invert(
+  int nIn, const void *pIn,       /* Input changeset */
+  int *pnOut, void **ppOut        /* OUT: Inverse of input */
+);
+</pre></blockquote><p>
+This function is used to "invert" a changeset object. Applying an inverted
+changeset to a database reverses the effects of applying the uninverted
+changeset. Specifically:</p>
+
+<p><ul>
+  <li> Each DELETE change is changed to an INSERT, and
+  <li> Each INSERT change is changed to a DELETE, and
+  <li> For each UPDATE change, the old.* and new.* values are exchanged.
+</ul></p>
+
+<p>This function does not change the order in which changes appear within
+the changeset. It merely reverses the sense of each individual change.</p>
+
+<p>If successful, a pointer to a buffer containing the inverted changeset
+is stored in *ppOut, the size of the same buffer is stored in *pnOut, and
+SQLITE_OK is returned. If an error occurs, both *pnOut and *ppOut are
+zeroed and an SQLite error code returned.</p>
+
+<p>It is the responsibility of the caller to eventually call sqlite3_free()
+on the *ppOut pointer to free the buffer allocation following a successful 
+call to this function.</p>
+
+<p>WARNING/TODO: This function currently assumes that the input is a valid
+changeset. If it is not, the results are undefined.
+</p><p>See also lists of
+  <a href="../session/objlist.html">Objects</a>,
+  <a href="../session/constlist.html">Constants</a>, and
+  <a href="../session/funclist.html">Functions</a>.</p>
+