</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;                <span class="keyword">typedef</span> <span class="keyword">typename</span> detail::interpolate&lt;T&gt;::type interpolate_type;</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;        <span class="keyword">public</span>:</div>
<div class="line"><a name="l00023"></a><span class="lineno">   