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62 lines
3.3 KiB
HTML
62 lines
3.3 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>The Test Tools</TITLE>
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<LINK rel="stylesheet" type="text/css" href="../../../style/btl.css" media="screen">
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<LINK rel="stylesheet" type="text/css" href="../../../style/btl-print.css" media="print">
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<META http-equiv="Content-Language" content="en-us">
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<META http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<STYLE type="text/css">
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H4
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{
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margin: 0px;
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}
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</STYLE>
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</HEAD>
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<BODY>
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<DIV class="body">
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<H3>BOOST_CHECK_EXCEPTION( statement, exception, predicate )</H3>
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<P class="first-line-indented">This tool is used to perform an exception detection
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and validation check. The tool executes the supplied statement and check
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that it throw the supplied exception or it's child and that exception comply
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to the supplied predicate. If the statement throw any other unrelated exception,
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doesn't throw at all or predicate evaluates to <I>false</I> with caught
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exception, check fails. In comparison with BOOST_CHECK_THROW this tool
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allows to perform more fine grained checks, for example that expected exception
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has specific error message etc.</P>
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<P class="first-line-indented">If check is successful, the tool produces a confirmation message (note:
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to manage what messages appear in the test output stream set the proper log level). In case if no
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exception thrown it produces an error message in a form "error in <test case name>: exception
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<<I>exception</I>> expected. In case if exception does not comply to specified predicate the
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tool produces an error message in a form "error in <test case name>: incorrect exception
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<<I>exception</I>> is caught.</P>
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<P class="first-line-indented">The tool's first parameter is the statement to execute while checking
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for exception. Use block statement if you want to execute more than one statement. The tool's second
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parameter is an expected exception. The last third parameter is a predicate function used to validate
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caught exception.</P>
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<H4>Example: test.cpp</H4>
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<PRE class="code"><SPAN class="reserv-word">struct</SPAN> my_exception {
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<SPAN class="reserv-word">explicit</SPAN> my_exception( <SPAN class="cpp-type">int</SPAN> ec = <SPAN class="literal">0</SPAN> ) : m_error_code( EC ) {}
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<SPAN class="cpp-type">int</SPAN> m_error_code;
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};
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<SPAN class="cpp-type">bool</SPAN> is_critical( my_exception <SPAN class="reserv-word">const</SPAN>& ex ) { <SPAN class="reserv-word">return </SPAN>ex.m_error_code < <SPAN class="literal">0</SPAN>; }
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<SPAN class="reserv-word">
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</SPAN><SPAN class="cpp-type">int</SPAN> test_main( <SPAN class="cpp-type">int</SPAN>, <SPAN class="cpp-type">char</SPAN>* [] ) {
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BOOST_CHECK_EXCEPTION( throw my_exception( 1 ), my_exception, is_critical );
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<SPAN class="reserv-word">return</SPAN> <SPAN class="literal">0</SPAN>;
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}</PRE>
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<H4>Output:</H4>
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<P class="test-output">test.cpp(9) : error in test_main: incorrect exception my_exception is caught</P>
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<DIV class="see_also">
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<H4>See Also</H4>
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<P class="see-also-content"><A href="BOOST_CHECK_THROW.html" target="descr">BOOST_CHECK_THROW</A></P>
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</DIV>
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</DIV>
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</BODY>
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</HTML>
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<!-- Copyright Gennadiy Rozental 2001-2004.
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or copy at www.boost.org/LICENSE_1_0.txt) -->
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