          dynamic_io_fnobj&lt;png_read_is_supported, png_reader&gt; op(<span class="keyword">this</span>);
<a name="l00097"></a>00097             <a class="code" href="group___variant.html#g3dc0a90911c08815be11e1e49ec06037" title="Invokes a generic constant operation (represented as a binary function object) on...">apply_operation</a>(<a class="code" href="g_i_l_0135.html#g55e45a15dddfc0d870c2f7fb9739cb2e" title="Returns the non-constant-pixel view of any image. The returned view is any view.">view</a>(im),