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  28 <h2><span class="refentrytitle">Macro BOOST_CONTRACT_POSTCONDITION</span></h2>
  29 <p>BOOST_CONTRACT_POSTCONDITION &#8212; Program postconditions that can be completely disabled at compile-time. </p>
  30 </div>
  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="reference.html#header.boost.contract_macro_hpp" title="Header &lt;boost/contract_macro.hpp&gt;">boost/contract_macro.hpp</a>&gt;
  33
  34 </span>BOOST_CONTRACT_POSTCONDITION(...)</pre></div>
  35 <div class="refsect1">
  36 <a name="idm45751726534672"></a><h2>Description</h2>
  37 <p><code class="computeroutput">BOOST_CONTRACT_POSTCONDITION(f)</code> expands to code equivalent to the following (note that no code is generated when  <code class="computeroutput"><a class="link" href="BOOST_CO_idm45123870511440.html" title="Macro BOOST_CONTRACT_NO_POSTCONDITIONS">BOOST_CONTRACT_NO_POSTCONDITIONS</a></code> is defined):</p>
  38 <pre class="programlisting"><span class="preprocessor">#ifndef</span> <span class="identifier">BOOST_CONTRACT_NO_POSTCONDITIONS</span>
  39     <span class="special">.</span><span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span>
  40 <span class="preprocessor">#endif</span>
  41 </pre>
  42 <p>Where:</p>
  43 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><code class="computeroutput"><span class="bold"><strong>f</strong></span></code> is the functor called by this library to check postconditions <code class="computeroutput">f(...)</code>. Assertions within this functor are usually programmed using  <code class="computeroutput"><a class="link" href="BOOST_CONTRACT_ASSERT.html" title="Macro BOOST_CONTRACT_ASSERT">BOOST_CONTRACT_ASSERT</a></code>, but any exception thrown by a call to this functor indicates a contract assertion failure (and will result in this library calling  <code class="computeroutput"><a class="link" href="boost/contract/postcondition_failure.html" title="Function postcondition_failure">boost::contract::postcondition_failure</a></code>). This functor should capture variables by (constant) references (to access the values they will have at function exit). This functor takes the return value (preferably by <code class="computeroutput">const&amp;</code>) as its one single parameter but only for virtual public functions and public functions overrides, otherwise it takes no parameter. (This is a variadic macro parameter so it can contain commas not protected by round parenthesis.)</p></li></ul></div>
  44 <p>
  45 </p>
  46 <p><span class="bold"><strong>See Also:</strong></span></p>
  47 <p> <a class="link" href="boost_contract/extras.html#boost_contract.extras.disable_contract_compilation__macro_interface_" title="Disable Contract Compilation (Macro Interface)">
  48         Disable Contract Compilation</a>,  <a class="link" href="boost_contract/tutorial.html#boost_contract.tutorial.postconditions" title="Postconditions"> Postconditions</a> </p>
  49 <p>
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