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50 lines
2.2 KiB
HTML
50 lines
2.2 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_WARN_SMALL( val, tolerance )<BR>
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BOOST_CHECK_CLOSE( val, tolerance )<BR>
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BOOST_REQUIRE_CLOSE( val, tolerance )</H3>
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<P class="first-line-indented">These tools are used to check that supplied
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values is small enough. The "smallness" is defined by absolute
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value of the tolerance supplied as a second argument. Note that to use these
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tools you need to include additional header<A href="../../../../../../boost/test/floating_point_comparison.hpp">
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floating_point_comparison.hpp</A>. Use these tools with caution. To compare
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to values on closeness it's preferable to use <A href="BOOST_CHECK_CLOSE.html">BOOST_<level>_CLOSE</A> tools. </P>
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<P class="first-line-indented">The first parameter is the value to check. The
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second parameter is the tolerance .</P>
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<H4>Example: test.cpp</H4>
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<PRE class="code"><SPAN class="cpp-type">int</SPAN> test_main( <SPAN class="cpp-type">int</SPAN>, <SPAN class="cpp-type">char</SPAN>* [] ) {
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<SPAN class="cpp-type">double</SPAN> v = -<SPAN class="literal">1.23456e-3</SPAN>;
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BOOST_CHECK_SMALL( v, <SPAN class="literal">0.000001</SPAN> );
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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(4) : error in test_main: absolute value of
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v{1.23456e-3} exeeds 1e-06</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_CLOSE.html" target="descr">BOOST_CHECK_CLOSE</A>,
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<A href="../floating_point_comparison.html" target="_top">Floating point
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comparison algorithms</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 2001-2005.
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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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