[ceph.git] / ceph / src / boost / libs / numeric / interval / doc / policies.htm

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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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7c673cae FG	1	<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
	2	"http://www.w3.org/TR/html4/loose.dtd">
	3
	4	<html>
	5	<head>
	6	<meta http-equiv="Content-Language" content="en-us">
	7	<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
	8	<link rel="stylesheet" type="text/css" href="../../../../boost.css">
	9
	10	<title>Policies</title>
	11	</head>
	12
	13	<body lang="en">
	14	<h1>Policies</h1>
	15
	16	<p>The <code>interval</code> template requires two arguments. The first
	17	corresponds to the base type chosen for the bounds. And the second defines
	18	the <a href="rounding.htm">rounding</a> and <a href=
	19	"checking.htm">checking</a> behaviors of the newly constructed class. This
	20	second argument is not mandatory but may need some customizations. In order
	21	to ease the manipulations, some helper templates are provided in
	22	<code>interval/policies.hpp</code>.</p>
	23	<pre>
	24	namespace boost {
	25	namespace numeric {
	26	namespace interval_lib {
	27
	28	template<class Rounding, class Checking>
	29	struct policies {
	30	typedef Rounding rounding;
	31	typedef Checking checking;
	32	};
	33
	34	template<class OldInterval, class NewRounding>
	35	struct change_rounding {
	36	typedef ... type;
	37	};
	38
	39	template<class OldInterval, class NewChecking>
	40	struct change_checking {
	41	typedef ... type;
	42	};
	43
	44	template<class OldInterval>
	45	struct unprotect {
	46	typedef ... type;
	47	};
	48
	49	} // namespace interval_lib
	50	} // namespace numeric
	51	} // namespace boost
	52	</pre>
	53
	54	<p>The <code>policies</code> template should be used whenever the user
	55	needs to define a policy structure for an <code>interval</code> class.
	56	<code>change_rounding</code> and <code>change_checking</code> can be used
	57	to get the type of a new interval by changing one of the policies of an old
	58	interval; the new type is available thanks to the type definition
	59	<code>type</code>. Finally, <code>unprotect</code> looks like
	60	<code>change_rounding</code> and directly changes the rounding of an
	61	interval to its unprotected version (a better explanation is available
	62	<a href="rounding.htm#perfexp">here</a>).</p>
	63	<hr>
	64
65	<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
66	"../../../../doc/images/valid-html401.png" alt="Valid HTML 4.01 Transitional"
67	height="31" width="88"></a></p>
68
69	<p>Revised
70	<!--webbot bot="Timestamp" s-type="EDITED" s-format="%Y-%m-%d" startspan -->2006-12-24<!--webbot bot="Timestamp" endspan i-checksum="12172" --></p>
71
72	<p><i>Copyright © 2002 Guillaume Melquiond, Sylvain Pion, Hervé
73	Brönnimann, Polytechnic University</i></p>
74
75	<p><i>Distributed under the Boost Software License, Version 1.0. (See
76	accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a>
77	or copy at <a href=
78	"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
79	</body>
80	</html>