cientific</span><span class="special">;</span> <span class="special">}</span>
<span class="special">};</span>

<span class="comment">// define a new generator type based on the new policy</span>
<span class="keyword">typedef</span> <span class="identifier">real_generator</span><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">scientific_policy</span><span class="special">&lt;</span><span class="keyword">double</span><span class="speci