onstructibleConcept&lt;D&gt;&gt;();</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        gil_function_requires&lt;boost::CopyConstructibleConcept&lt;D&gt;&gt;();</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;        gil_function_requires&lt;boost::AssignableConcept&lt;D&gt;&gt;();</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;</div><div class="line"><a name="l00070"></a><span class="lineno">   70<