<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>So How are Policies Used Anyway?</title> <link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.74.0"> <link rel="home" href="../../../index.html" title="Math Toolkit"> <link rel="up" href="../pol_tutorial.html" title="Policy Tutorial"> <link rel="prev" href="policy_tut_defaults.html" title="Policies Have Sensible Defaults"> <link rel="next" href="changing_policy_defaults.html" title="Changing the Policy Defaults"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td> <td align="center"><a href="../../../../../../../../index.html">Home</a></td> <td align="center"><a href="../../../../../../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="policy_tut_defaults.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../pol_tutorial.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="changing_policy_defaults.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section" lang="en"> <div class="titlepage"><div><div><h4 class="title"> <a name="math_toolkit.policy.pol_tutorial.policy_usage"></a><a class="link" href="policy_usage.html" title="So How are Policies Used Anyway?"> So How are Policies Used Anyway?</a> </h4></div></div></div> <p> The details follow later, but basically policies can be set by either: </p> <div class="itemizedlist"><ul type="disc"> <li> Defining some macros that change the default behaviour: <span class="bold"><strong>this is the recommended method for setting installation-wide policies</strong></span>. </li> <li> By instantiating a distribution object with an explicit policy: this is mainly reserved for ad hoc policy changes. </li> <li> By passing a policy to a special function as an optional final argument: this is mainly reserved for ad hoc policy changes. </li> <li> By using some helper macros to define a set of functions or distributions in the current namespace that use a specific policy: <span class="bold"><strong>this is the recommended method for setting policies on a project- or translation-unit-wide basis</strong></span>. </li> </ul></div> <p> The following sections introduce these methods in more detail. </p> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2006 , 2007, 2008, 2009 John Maddock, Paul A. Bristow, Hubert Holin, Xiaogang Zhang, Bruno Lalande, Johan Råde, Gautam Sewani and Thijs van den Berg<p> Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="policy_tut_defaults.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../pol_tutorial.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="changing_policy_defaults.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>