">   66</span>    </div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span>    <a class="code hl_typedef" href="namespacetram.html#a0ec6f1beb2db1148bf277a12019a7ac0">collision_callback</a> activation = <span class="keyword">nullptr</span>;</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span>    <a class="code hl_typedef" href="namespacetram.html#a0ec6f1beb2db1148bf277a12019a7ac0">collision_callback</a> deactivation = <span class="keywor