1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> 4<title>Macro BOOST_CONTRACT_ON_MISSING_CHECK_DECL</title> 5<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="index.html" title="Chapter 1. Boost.Contract 1.0.0"> 8<link rel="up" href="reference.html#header.boost.contract.core.config_hpp" title="Header <boost/contract/core/config.hpp>"> 9<link rel="prev" href="BOOST_CONTRACT_PERMISSIVE.html" title="Macro BOOST_CONTRACT_PERMISSIVE"> 10<link rel="next" href="BOOST_CO_idm45394999685184.html" title="Macro BOOST_CONTRACT_PRECONDITIONS_DISABLE_NO_ASSERTION"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> 15<td align="center"><a href="../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="BOOST_CONTRACT_PERMISSIVE.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="reference.html#header.boost.contract.core.config_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="BOOST_CO_idm45394999685184.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="refentry"> 26<a name="BOOST_CO_idm45394999694064"></a><div class="titlepage"></div> 27<div class="refnamediv"> 28<h2><span class="refentrytitle">Macro BOOST_CONTRACT_ON_MISSING_CHECK_DECL</span></h2> 29<p>BOOST_CONTRACT_ON_MISSING_CHECK_DECL — 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> 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: <<a class="link" href="reference.html#header.boost.contract.core.config_hpp" title="Header <boost/contract/core/config.hpp>">boost/contract/core/config.hpp</a>> 33 34</span>BOOST_CONTRACT_ON_MISSING_CHECK_DECL</pre></div> 35<div class="refsect1"> 36<a name="idm45707996829472"></a><h2>Description</h2> 37<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> 38<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> 39<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> 40</pre> 41<p><span class="bold"><strong>See Also:</strong></span></p> 42<p> <a class="link" href="boost_contract/tutorial.html" title="Tutorial"> Tutorial</a> </p> 43<p> 44</p> 45<p> 46</p> 47</div> 48</div> 49<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 50<td align="left"></td> 51<td align="right"><div class="copyright-footer">Copyright © 2008-2019 Lorenzo Caminiti<p> 52 Distributed under the Boost Software License, Version 1.0 (see accompanying 53 file LICENSE_1_0.txt or a copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 54 </p> 55</div></td> 56</tr></table> 57<hr> 58<div class="spirit-nav"> 59<a accesskey="p" href="BOOST_CONTRACT_PERMISSIVE.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="reference.html#header.boost.contract.core.config_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="BOOST_CO_idm45394999685184.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 60</div> 61</body> 62</html> 63
