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4 | <title>Policy Overview</title> | |
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8 | <link rel="up" href="../policy.html" title="Chapter 15. Policies: Controlling Precision, Error Handling etc"> | |
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24 | </div> | |
25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> | |
27 | <a name="math_toolkit.pol_overview"></a><a class="link" href="pol_overview.html" title="Policy Overview">Policy Overview</a> | |
28 | </h2></div></div></div> | |
29 | <p> | |
30 | Policies are a powerful fine-grain mechanism that allow you to customise the | |
31 | behaviour of this library according to your needs. There is more information | |
32 | available in the <a class="link" href="pol_tutorial.html" title="Policy Tutorial">policy tutorial</a> | |
33 | and the <a class="link" href="pol_ref.html" title="Policy Reference">policy reference</a>. | |
34 | </p> | |
35 | <p> | |
36 | Generally speaking, unless you find that the <a class="link" href="pol_tutorial/policy_tut_defaults.html" title="Policies Have Sensible Defaults">default | |
37 | policy behaviour</a> when encountering 'bad' argument values does not meet | |
38 | your needs, you should not need to worry about policies. | |
39 | </p> | |
40 | <p> | |
41 | Policies are a compile-time mechanism that allow you to change error-handling | |
42 | or calculation precision either program wide, or at the call site. | |
43 | </p> | |
44 | <p> | |
45 | Although the policy mechanism itself is rather complicated, in practice it | |
46 | is easy to use, and very flexible. | |
47 | </p> | |
48 | <p> | |
49 | Using policies you can control: | |
50 | </p> | |
51 | <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> | |
52 | <li class="listitem"> | |
53 | <a class="link" href="pol_ref/error_handling_policies.html" title="Error Handling Policies">How results | |
54 | from 'bad' arguments are handled</a>, including those that cannot be | |
55 | fully evaluated. | |
56 | </li> | |
57 | <li class="listitem"> | |
58 | How <a class="link" href="pol_ref/internal_promotion.html" title="Internal Floating-point Promotion Policies">accuracy is | |
59 | controlled by internal promotion</a> to use more precise types. | |
60 | </li> | |
61 | <li class="listitem"> | |
62 | What working <a class="link" href="pol_ref/precision_pol.html" title="Precision Policies">precision</a> | |
63 | should be used to calculate results. | |
64 | </li> | |
65 | <li class="listitem"> | |
66 | What to do when a <a class="link" href="pol_ref/assert_undefined.html" title="Mathematically Undefined Function Policies">mathematically | |
67 | undefined function</a> is used: Should this raise a run-time or compile-time | |
68 | error? | |
69 | </li> | |
70 | <li class="listitem"> | |
71 | Whether <a class="link" href="pol_ref/discrete_quant_ref.html" title="Discrete Quantile Policies">discrete | |
72 | functions</a>, like the binomial, should return real or only integral | |
73 | values, and how they are rounded. | |
74 | </li> | |
75 | <li class="listitem"> | |
76 | How many iterations a special function is permitted to perform in a series | |
77 | evaluation or root finding algorithm before it gives up and raises an | |
78 | <a class="link" href="error_handling.html#math_toolkit.error_handling.evaluation_error">evaluation_error</a>. | |
79 | </li> | |
80 | </ul></div> | |
81 | <p> | |
82 | You can control policies: | |
83 | </p> | |
84 | <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> | |
85 | <li class="listitem"> | |
86 | Using <a class="link" href="pol_ref/policy_defaults.html" title="Using Macros to Change the Policy Defaults">macros</a> | |
87 | to change any default policy: the is the preferred method for installation | |
88 | wide policies. | |
89 | </li> | |
90 | <li class="listitem"> | |
91 | At your chosen <a class="link" href="pol_ref/namespace_pol.html" title="Setting Polices at Namespace Scope">namespace | |
92 | scope</a> for distributions and/or functions: this is the preferred | |
93 | method for project, namespace, or translation unit scope policies. | |
94 | </li> | |
95 | <li class="listitem"> | |
96 | In an ad-hoc manner <a class="link" href="pol_tutorial/ad_hoc_sf_policies.html" title="Changing the Policy on an Ad Hoc Basis for the Special Functions">by | |
97 | passing a specific policy to a special function</a>, or to a <a class="link" href="pol_tutorial/ad_hoc_dist_policies.html" title="Setting Policies for Distributions on an Ad Hoc Basis">statistical | |
98 | distribution</a>. | |
99 | </li> | |
100 | </ul></div> | |
101 | </div> | |
102 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
103 | <td align="left"></td> | |
104 | <td align="right"><div class="copyright-footer">Copyright © 2006-2010, 2012-2014 Nikhar Agrawal, | |
105 | Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert | |
106 | Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Johan Råde, Gautam Sewani, | |
107 | Benjamin Sobotta, Thijs van den Berg, Daryle Walker and Xiaogang Zhang<p> | |
108 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
109 | 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>) | |
110 | </p> | |
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