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52 lines
2.6 KiB
HTML
52 lines
2.6 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_REQUIRE_PREDICATE( predicate, arity, arguments_list ) </H3>
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<P class="first-line-indented">This tool is used to validate the supplied predicate and abort the current
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test case processing if it fails. This test tool is generic. It allows to validate arbitrary one or
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two arity predicate. To validate zero or more then two arity predicate use <A href="BOOST_REQUIRE.html" target="descr">BOOST_REQUIRE</A>
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tool. The advantage of this tool is that shows arguments values in case of predicate failure.</P>
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<P class="first-line-indented">If predicate evaluates to <I> true</I>, the tool produces a confirmation
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message (note: to manage what messages appear in the test output stream set the proper log level),
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in other case it produces an error message in a form "error in <test case name>: test <predicate>(
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arguments_list ) fail for (arguments values)" and abort the current test case processing.</P>
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<H4>Example: test.cpp</H4>
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<PRE class="code"><SPAN class="cpp-type">int</SPAN> test.cpp( <SPAN class="cpp-type">int</SPAN>, <SPAN class="cpp-type">char</SPAN>* [] ) {
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<SPAN class="cpp-type">double</SPAN> fp1 = <SPAN class="literal">1.23456e-10</SPAN>;
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<SPAN class="cpp-type">double</SPAN> fp2 = <SPAN class="literal">1.23457e-10</SPAN>;
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<SPAN class="cpp-type">double</SPAN> epsilon = <SPAN class="literal">8.1e-6</SPAN>;
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<SPAN class="comment">// check weak closeness </SPAN>
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BOOST_REQUIRE_PREDICATE( close_at_tolerance<double>( epsilon, <SPAN class="reserv-word">false</SPAN> ),
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<SPAN class="literal">2</SPAN>, ( fp1, fp2 ) ); <SPAN class="comment">// should pass</SPAN>
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<SPAN class="reserv-word">return</SPAN> <SPAN class="literal">0</SPAN>;
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}
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</PRE>
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<H4>Output:</H4>
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<P class="test-output"> </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_REQUIRE.html" target="descr">BOOST_REQUIRE</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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