boost_1_45_0/libs/numeric/interval/doc/policies.htm - nest-learning-thermostat/5.0/boost - Git at Google

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   <h1>Policies</h1>

   <p>The <code>interval</code> template requires two arguments. The first
   corresponds to the base type chosen for the bounds. And the second defines
   the <a href="rounding.htm">rounding</a> and <a href=
   "checking.htm">checking</a> behaviors of the newly constructed class. This
   second argument is not mandatory but may need some customizations. In order
   to ease the manipulations, some helper templates are provided in
   <code>interval/policies.hpp</code>.</p>
   <pre>
 namespace boost {
 namespace numeric {
 namespace interval_lib {

 template&lt;class Rounding, class Checking&gt;
 struct policies {
   typedef Rounding rounding;
   typedef Checking checking;
 };

 template&lt;class OldInterval, class NewRounding&gt;
 struct change_rounding {
   typedef ... type;
 };

 template&lt;class OldInterval, class NewChecking&gt;
 struct change_checking {
   typedef ... type;
 };

 template&lt;class OldInterval&gt;
 struct unprotect {
   typedef ... type;
 };

 } // namespace interval_lib
 } // namespace numeric
 } // namespace boost
 </pre>

   <p>The <code>policies</code> template should be used whenever the user
   needs to define a policy structure for an <code>interval</code> class.
   <code>change_rounding</code> and <code>change_checking</code> can be used
   to get the type of a new interval by changing one of the policies of an old
   interval; the new type is available thanks to the type definition
   <code>type</code>. Finally, <code>unprotect</code> looks like
   <code>change_rounding</code> and directly changes the rounding of an
   interval to its unprotected version (a better explanation is available
   <a href="rounding.htm#perfexp">here</a>).</p>
   <hr>

   <p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
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   <p>Revised
   <!--webbot bot="Timestamp" s-type="EDITED" s-format="%Y-%m-%d" startspan -->2006-12-24<!--webbot bot="Timestamp" endspan i-checksum="12172" --></p>

   <p><i>Copyright &copy; 2002 Guillaume Melquiond, Sylvain Pion, Herv&eacute;
   Br&ouml;nnimann, Polytechnic University</i></p>

   <p><i>Distributed under the Boost Software License, Version 1.0. (See
   accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a>
   or copy at <a href=
   "http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
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	<title>Policies</title>
	</head>

	<body lang="en">
	<h1>Policies</h1>

	<p>The <code>interval</code> template requires two arguments. The first
	corresponds to the base type chosen for the bounds. And the second defines
	the <a href="rounding.htm">rounding</a> and <a href=
	"checking.htm">checking</a> behaviors of the newly constructed class. This
	second argument is not mandatory but may need some customizations. In order
	to ease the manipulations, some helper templates are provided in
	<code>interval/policies.hpp</code>.</p>
	<pre>
	namespace boost {
	namespace numeric {
	namespace interval_lib {

	template<class Rounding, class Checking>
	struct policies {
	typedef Rounding rounding;
	typedef Checking checking;
	};

	template<class OldInterval, class NewRounding>
	struct change_rounding {
	typedef ... type;
	};

	template<class OldInterval, class NewChecking>
	struct change_checking {
	typedef ... type;
	};

	template<class OldInterval>
	struct unprotect {
	typedef ... type;
	};

	} // namespace interval_lib
	} // namespace numeric
	} // namespace boost
	</pre>

	<p>The <code>policies</code> template should be used whenever the user
	needs to define a policy structure for an <code>interval</code> class.
	<code>change_rounding</code> and <code>change_checking</code> can be used
	to get the type of a new interval by changing one of the policies of an old
	interval; the new type is available thanks to the type definition
	<code>type</code>. Finally, <code>unprotect</code> looks like
	<code>change_rounding</code> and directly changes the rounding of an
	interval to its unprotected version (a better explanation is available
	<a href="rounding.htm#perfexp">here</a>).</p>
	<hr>

	<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
	"../../../../doc/images/valid-html401.png" alt="Valid HTML 4.01 Transitional"
	height="31" width="88"></a></p>

	<p>Revised
	<!--webbot bot="Timestamp" s-type="EDITED" s-format="%Y-%m-%d" startspan -->2006-12-24<!--webbot bot="Timestamp" endspan i-checksum="12172" --></p>

	<p><i>Copyright © 2002 Guillaume Melquiond, Sylvain Pion, Hervé
	Brönnimann, Polytechnic University</i></p>

	<p><i>Distributed under the Boost Software License, Version 1.0. (See
	accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a>
	or copy at <a href=
	"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
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