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<H3>BOOST_WARN_SMALL( val, tolerance )<BR>
BOOST_CHECK_CLOSE( val, tolerance )<BR>
BOOST_REQUIRE_CLOSE( val, tolerance )</H3>
<P class="first-line-indented">These tools are used to check that supplied
values is small enough. The "smallness" is defined by absolute
value of the tolerance supplied as a second argument. Note that to use these
tools you need to include additional header<A href="../../../../../../boost/test/floating_point_comparison.hpp">
floating_point_comparison.hpp</A>. Use these tools with caution. To compare
to values on closeness it's preferable to use <A href="BOOST_CHECK_CLOSE.html">BOOST_<level>_CLOSE</A> tools. </P>
<P class="first-line-indented">The first parameter is the value to check. The
second parameter is the tolerance .</P>
<H4>Example: test.cpp</H4>
<PRE class="code"><SPAN class="cpp-type">int</SPAN> test_main( <SPAN class="cpp-type">int</SPAN>, <SPAN class="cpp-type">char</SPAN>* [] ) {
<SPAN class="cpp-type">double</SPAN> v = -<SPAN class="literal">1.23456e-3</SPAN>;
BOOST_CHECK_SMALL( v, <SPAN class="literal">0.000001</SPAN> );
<SPAN class="reserv-word">return</SPAN> <SPAN class="literal">0</SPAN>;
}</PRE>
<H4>Output:</H4>
<P class="test-output">test.cpp(4) : error in test_main: absolute value of
v{1.23456e-3} exeeds 1e-06</P>
<DIV class="see_also">
<H4>See Also</H4>
<P class="see-also-content"><A href="BOOST_CHECK_CLOSE.html" target="descr">BOOST_CHECK_CLOSE</A>,
<A href="../floating_point_comparison.html" target="_top">Floating point
comparison algorithms</A></P>
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