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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="math_toolkit.main_overview.pol_overview"></a><a class="link" href="pol_overview.html" title="Configuration and Policies"> Configuration |
| and Policies</a> |
| </h3></div></div></div> |
| <p> |
| </p> |
| <p> |
| Policies are a powerful fine-grain mechanism that allow you to customise |
| the behaviour of this library according to your needs. There is more information |
| available in the <a class="link" href="../policy/pol_tutorial.html" title="Policy Tutorial">policy |
| tutorial</a> and the <a class="link" href="../policy/pol_ref.html" title="Policy Reference">policy |
| reference</a>. |
| </p> |
| <p> |
| </p> |
| <p> |
| Generally speaking, unless you find that the <a class="link" href="../policy/pol_tutorial/policy_tut_defaults.html" title="Policies Have Sensible Defaults">default |
| policy behaviour</a> when encountering 'bad' argument values does not |
| meet your needs, you should not need to worry about policies. |
| </p> |
| <p> |
| </p> |
| <p> |
| Policies are a compile-time mechanism that allow you to change error-handling |
| or calculation precision either program wide, or at the call site. |
| </p> |
| <p> |
| </p> |
| <p> |
| Although the policy mechanism itself is rather complicated, in practice |
| it is easy to use, and very flexible. |
| </p> |
| <p> |
| </p> |
| <p> |
| Using policies you can control: |
| </p> |
| <p> |
| </p> |
| <div class="itemizedlist"><ul type="disc"> |
| <li> |
| <a class="link" href="../policy/pol_ref/error_handling_policies.html" title="Error Handling Policies">How |
| results from 'bad' arguments are handled</a>, including those that |
| cannot be fully evaluated. |
| </li> |
| <li> |
| How <a class="link" href="../policy/pol_ref/internal_promotion.html" title="Internal Floating-point Promotion Policies">accuracy |
| is controlled by internal promotion</a> to use more precise types. |
| </li> |
| <li> |
| What working <a class="link" href="../policy/pol_ref/precision_pol.html" title="Precision Policies">precision</a> |
| should be used to calculate results. |
| </li> |
| <li> |
| What to do when a <a class="link" href="../policy/pol_ref/assert_undefined.html" title="Mathematically Undefined Function Policies">mathematically |
| undefined function</a> is used: Should this raise a run-time or |
| compile-time error? |
| </li> |
| <li> |
| Whether <a class="link" href="../policy/pol_ref/discrete_quant_ref.html" title="Discrete Quantile Policies">discrete |
| functions</a>, like the binomial, should return real or only integral |
| values, and how they are rounded. |
| </li> |
| <li> |
| How many iterations a special function is permitted to perform in a |
| series evaluation or root finding algorithm before it gives up and |
| raises an <a class="link" href="error_handling.html#evaluation_error">evaluation_error</a>. |
| </li> |
| </ul></div> |
| <p> |
| </p> |
| <p> |
| You can control policies: |
| </p> |
| <p> |
| </p> |
| <div class="itemizedlist"><ul type="disc"> |
| <li> |
| Using <a class="link" href="../policy/pol_ref/policy_defaults.html" title="Using macros to Change the Policy Defaults">macros</a> |
| to change any default policy: the is the prefered method for installation |
| wide policies. |
| </li> |
| <li> |
| At your chosen <a class="link" href="../policy/pol_ref/namespace_pol.html" title="Setting Polices at Namespace Scope">namespace |
| scope</a> for distributions and/or functions: this is the prefered |
| method for project, namespace, or translation unit scope policies. |
| </li> |
| <li> |
| In an ad-hoc manner <a class="link" href="../policy/pol_tutorial/ad_hoc_sf_policies.html" title="Changing the Policy on an Ad Hoc Basis for the Special Functions">by |
| passing a specific policy to a special function</a>, or to a <a class="link" href="../policy/pol_tutorial/ad_hoc_dist_policies.html" title="Setting Policies for Distributions on an Ad Hoc Basis">statistical |
| distribution</a>. |
| </li> |
| </ul></div> |
| <p> |
| </p> |
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| <td align="right"><div class="copyright-footer">Copyright © 2006 , 2007, 2008, 2009, 2010 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>) |
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