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<title>Macro BOOST_CONTRACT_ON_MISSING_CHECK_DECL</title>
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<h2><span class="refentrytitle">Macro BOOST_CONTRACT_ON_MISSING_CHECK_DECL</span></h2>
<p>BOOST_CONTRACT_ON_MISSING_CHECK_DECL &#8212; Code block to execute if contracts are not assigned to a  <code class="computeroutput"><a class="link" href="boost/contract/check.html" title="Class check">boost::contract::check</a></code> variable (undefined and executes <code class="computeroutput">BOOST_ASSERT(false)</code> by default). </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<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.core.config_hpp" title="Header &lt;boost/contract/core/config.hpp&gt;">boost/contract/core/config.hpp</a>&gt;

</span>BOOST_CONTRACT_ON_MISSING_CHECK_DECL</pre></div>
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<a name="idm45707996829472"></a><h2>Description</h2>
<p>In general, there is a logic error in the program when contracts are not explicitly assigned to a local variable of type  <code class="computeroutput"><a class="link" href="boost/contract/check.html" title="Class check">boost::contract::check</a></code> and without using C++11 <code class="computeroutput">auto</code> declarations (because that is a misuse of this library). Therefore, by default (i.e., when this macro is not defined) this library calls <code class="computeroutput">BOOST_ASSERT(false)</code> in those cases. If this macro is defined, this library will execute the code expanded by this macro instead of calling <code class="computeroutput">BOOST_ASSERT(false)</code> (if programmers prefer to throw an exception, etc.).</p>
<p>This macro can also be defined to be any block of code (and use empty curly brackets <code class="computeroutput">{}</code> to generate no error, not recommended), for example (on GCC): </p>
<pre class="programlisting"><span class="identifier">gcc</span> <span class="special">-</span><span class="identifier">DBOOST_CONTRACT_ON_MISSING_CHECK_DECL</span><span class="special">=</span><span class="char">'{ throw std::logic_error("missing contract check declaration"); }'</span> <span class="special">...</span>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2008-2019 Lorenzo Caminiti<p>
        Distributed under the Boost Software License, Version 1.0 (see accompanying
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