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| <div class="section" lang="en"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="math_toolkit.policy.pol_ref.pol_ref_ref"></a><a class="link" href="pol_ref_ref.html" title="Policy Class Reference"> Policy Class |
| Reference</a> |
| </h4></div></div></div> |
| <p> |
| There's very little to say here, the <code class="computeroutput"><span class="identifier">policy</span></code> |
| class is just a rag-bag compile-time container for a collection of policies: |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">math</span><span class="special">/</span><span class="identifier">policies</span><span class="special">/</span><span class="identifier">policy</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></pre> |
| <p> |
| </p> |
| <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span> |
| <span class="keyword">namespace</span> <span class="identifier">math</span><span class="special">{</span> |
| <span class="keyword">namespace</span> <span class="identifier">policies</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">A1</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A2</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A3</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A4</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A5</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A6</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A7</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A8</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A9</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A10</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A11</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A12</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A13</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">policy</span> |
| <span class="special">{</span> |
| <span class="keyword">public</span><span class="special">:</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">domain_error_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">pole_error_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">overflow_error_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">underflow_error_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">denorm_error_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">rounding_error_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">evaluation_error_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">indeterminate_result_error_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">precision_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">promote_float_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">promote_double_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">discrete_quantile_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="emphasis"><em>computed-from-template-arguments</em></span> <span class="identifier">assert_undefined_type</span><span class="special">;</span> |
| <span class="special">};</span> |
| |
| <span class="keyword">template</span> <span class="special"><...</span><span class="identifier">argument</span> <span class="identifier">list</span><span class="special">...></span> |
| <span class="keyword">typename</span> <span class="identifier">normalise</span><span class="special"><</span><span class="identifier">policy</span><span class="special"><>,</span> <span class="identifier">A1</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">make_policy</span><span class="special">(...</span><span class="identifier">argument</span> <span class="identifier">list</span><span class="special">..);</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A1</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A2</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A3</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A4</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A5</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A6</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A7</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A8</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A9</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A10</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A11</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A12</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A13</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">normalise</span> |
| <span class="special">{</span> |
| <span class="keyword">typedef</span> computed-from-template-arguments <span class="identifier">type</span><span class="special">;</span> |
| <span class="special">};</span> |
| </pre> |
| <p> |
| The member typedefs of class <code class="computeroutput"><span class="identifier">policy</span></code> |
| are intended for internal use but are documented briefly here for the sake |
| of completeness. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">domain_error_type</span> |
| </pre> |
| <p> |
| Specifies how domain errors are handled, will be an instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">domain_error</span><span class="special"><></span></code> |
| with the template argument to <code class="computeroutput"><span class="identifier">domain_error</span></code> |
| one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code> |
| enumerated values. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">pole_error_type</span> |
| </pre> |
| <p> |
| Specifies how pole-errors are handled, will be an instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">pole_error</span><span class="special"><></span></code> |
| with the template argument to <code class="computeroutput"><span class="identifier">pole_error</span></code> |
| one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code> |
| enumerated values. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">overflow_error_type</span> |
| </pre> |
| <p> |
| Specifies how overflow errors are handled, will be an instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">overflow_error</span><span class="special"><></span></code> |
| with the template argument to <code class="computeroutput"><span class="identifier">overflow_error</span></code> |
| one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code> |
| enumerated values. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">underflow_error_type</span> |
| </pre> |
| <p> |
| Specifies how underflow errors are handled, will be an instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">underflow_error</span><span class="special"><></span></code> |
| with the template argument to <code class="computeroutput"><span class="identifier">underflow_error</span></code> |
| one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code> |
| enumerated values. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">denorm_error_type</span> |
| </pre> |
| <p> |
| Specifies how denorm errors are handled, will be an instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">denorm_error</span><span class="special"><></span></code> |
| with the template argument to <code class="computeroutput"><span class="identifier">denorm_error</span></code> |
| one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code> |
| enumerated values. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">rounding_error_type</span> |
| </pre> |
| <p> |
| Specifies how rounding errors are handled, will be an instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">rounding_error</span><span class="special"><></span></code> |
| with the template argument to <code class="computeroutput"><span class="identifier">rounding_error</span></code> |
| one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code> |
| enumerated values. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">evaluation_error_type</span> |
| </pre> |
| <p> |
| Specifies how evaluation errors are handled, will be an instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">evaluation_error</span><span class="special"><></span></code> |
| with the template argument to <code class="computeroutput"><span class="identifier">evaluation_error</span></code> |
| one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code> |
| enumerated values. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">indeterminate_error_type</span> |
| </pre> |
| <p> |
| Specifies how indeterminate result errors are handled, will be an instance |
| of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">indeterminate_result_error</span><span class="special"><></span></code> |
| with the template argument to <code class="computeroutput"><span class="identifier">indeterminate_result_error</span></code> |
| one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code> |
| enumerated values. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">precision_type</span> |
| </pre> |
| <p> |
| Specifies the internal precision to use in binary digits (uses zero to |
| represent whatever the default precision is). Will be an instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">digits2</span><span class="special"><</span><span class="identifier">N</span><span class="special">></span></code> |
| which in turn inherits from <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special"><</span><span class="identifier">N</span><span class="special">></span></code>. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">promote_float_type</span> |
| </pre> |
| <p> |
| Specifies whether or not to promote <code class="computeroutput"><span class="keyword">float</span></code> |
| arguments to <code class="computeroutput"><span class="keyword">double</span></code> precision |
| internally. Will be an instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">promote_float</span><span class="special"><</span><span class="identifier">B</span><span class="special">></span></code> which in turn inherits from <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">bool_</span><span class="special"><</span><span class="identifier">B</span><span class="special">></span></code>. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">promote_double_type</span> |
| </pre> |
| <p> |
| Specifies whether or not to promote <code class="computeroutput"><span class="keyword">double</span></code> |
| arguments to <code class="computeroutput"><span class="keyword">long</span> <span class="keyword">double</span></code> |
| precision internally. Will be an instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">promote_float</span><span class="special"><</span><span class="identifier">B</span><span class="special">></span></code> which in turn inherits from <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">bool_</span><span class="special"><</span><span class="identifier">B</span><span class="special">></span></code>. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">discrete_quantile_type</span> |
| </pre> |
| <p> |
| Specifies how discrete quantiles are evaluated, will be an instance of |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">discrete_quantile</span><span class="special"><></span></code> |
| instantiated with one of the <code class="computeroutput"><span class="identifier">discrete_quantile_policy_type</span></code> |
| enumerated type. |
| </p> |
| <pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">assert_undefined_type</span> |
| </pre> |
| <p> |
| Specifies whether mathematically-undefined properties are asserted as compile-time |
| errors, or treated as runtime errors instead. Will be an instance of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">policies</span><span class="special">::</span><span class="identifier">assert_undefined</span><span class="special"><</span><span class="identifier">B</span><span class="special">></span></code> |
| which in turn inherits from <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">math</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">bool_</span><span class="special"><</span><span class="identifier">B</span><span class="special">></span></code>. |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><...</span><span class="identifier">argument</span> <span class="identifier">list</span><span class="special">...></span> |
| <span class="keyword">typename</span> <span class="identifier">normalise</span><span class="special"><</span><span class="identifier">policy</span><span class="special"><>,</span> <span class="identifier">A1</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">make_policy</span><span class="special">(...</span><span class="identifier">argument</span> <span class="identifier">list</span><span class="special">..);</span> |
| </pre> |
| <p> |
| <code class="computeroutput"><span class="identifier">make_policy</span></code> is a helper |
| function that converts a list of policies into a normalised <code class="computeroutput"><span class="identifier">policy</span></code> class. |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A1</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A2</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A3</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A4</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A5</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A6</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A7</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A8</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A9</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A10</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A11</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A12</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span> |
| <span class="keyword">class</span> <span class="identifier">A13</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">normalise</span> |
| <span class="special">{</span> |
| <span class="keyword">typedef</span> computed-from-template-arguments <span class="identifier">type</span><span class="special">;</span> |
| <span class="special">};</span> |
| </pre> |
| <p> |
| The <code class="computeroutput"><span class="identifier">normalise</span></code> class template |
| converts one instantiation of the <code class="computeroutput"><span class="identifier">policy</span></code> |
| class into a normalised form. This is used internally to reduce code bloat: |
| so that instantiating a special function on <code class="computeroutput"><span class="identifier">policy</span><span class="special"><</span><span class="identifier">A</span><span class="special">,</span><span class="identifier">B</span><span class="special">></span></code> |
| or <code class="computeroutput"><span class="identifier">policy</span><span class="special"><</span><span class="identifier">B</span><span class="special">,</span><span class="identifier">A</span><span class="special">></span></code> actually both generate the same code |
| internally. |
| </p> |
| <p> |
| Further more, <code class="computeroutput"><span class="identifier">normalise</span></code> |
| can be used to combine a policy with one or more policies: for example |
| many of the special functions will use this to set policies which they |
| don't make use of to their default values, before forwarding to the actual |
| implementation. In this way code bloat is reduced, since the actual implementation |
| depends only on the policy types that they actually use. |
| </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, 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>) |
| </p> |
| </div></td> |
| </tr></table> |
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