e</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#endif</span>
</pre>
<p>Or, use the <code class="computeroutput">boost/contract_macro.hpp</code> header and related macros instead (because the <code class="computeroutput">boost/contract_macro.hpp</code> header is already optimized to n