</span> mpl::bool_&lt;png_write_support&lt;View&gt;::is_supported&gt; {};
<a name="l00048"></a>00048 };
<a name="l00049"></a>00049 
<a name="l00050"></a>00050 <span class="keyword">class </span>png_writer_dynamic : <span class="keyword">public</span> png_writer {
<a name="l00051"></a>00051 <span class="keyword">public</span>:
<a name="l00052"></a>00052     png_writer_dynamic(FILE* file          ) : png_writer(file)    {}
<a name="l00053"></a>00053     png_writer_dynamic(<span class="keyword">const</span> <s