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	<title>BOOST_PP_SUB_D</title>
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		The <b>BOOST_PP_SUB_D</b> macro expands to the difference between its second and third arguments.&nbsp;
		It reenters <b>BOOST_PP_WHILE</b> with maximum efficiency.
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	<h4>Usage</h4>
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			<b>BOOST_PP_SUB_D</b>(<i>d</i>, <i>x</i>, <i>y</i>)
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	<h4>Arguments</h4>
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			<dt>d</dt>
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				The next available <b>BOOST