an>&#160;</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;            <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="class_s_p_h_1_1fluid__dynamics_1_1_surface_norm_with_wall.html#aa1ea133666a12c5d53cbd54a0a450716">Interaction</a>(<span class="keywordtype">size_t</span> index_i, Real dt = 0.0) <span class="keyword">override</span>;</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;        };