group_session : <span><a href="../Types/OutboundGroupSession/index.html#type-t">Types.OutboundGroupSession.t</a> Ctypes_static.ptr</span> <span>&#45;&gt;</span> Unsigned.size_t</code></dt><dd><p><code>clear_outbound_group_session sess</code></p><p>Initialise an outbound group session object using the supplied memory The supplied memory should be at least olm_outbound_group_session_size() bytes.</p></dd></dl><dl><dt class="spec value" id="val-pickle_outbound_group_session_length"><a href="#val-pickle_outboun