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<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">&lt;</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">&gt;</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">&lt;</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">&gt;</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">&lt;...</span><span class="identifier">argument</span> <span class="identifier">list</span><span class="special">...&gt;</span>
<span class="keyword">typename</span> <span class="identifier">normalise</span><span class="special">&lt;</span><span class="identifier">policy</span><span class="special">&lt;&gt;,</span> <span class="identifier">A1</span><span class="special">&gt;::</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">&lt;</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">&gt;</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">&lt;...&gt;::</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">&lt;&gt;</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">&lt;...&gt;::</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">&lt;&gt;</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">&lt;...&gt;::</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">&lt;&gt;</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">&lt;...&gt;::</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">&lt;&gt;</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">&lt;...&gt;::</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">&lt;&gt;</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">&lt;...&gt;::</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">&lt;&gt;</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">&lt;...&gt;::</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">&lt;&gt;</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">&lt;...&gt;::</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">&lt;&gt;</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">&lt;...&gt;::</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">&lt;</span><span class="identifier">N</span><span class="special">&gt;</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">&lt;</span><span class="identifier">N</span><span class="special">&gt;</span></code>.
</p>
<pre class="programlisting"><span class="identifier">policy</span><span class="special">&lt;...&gt;::</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">&lt;</span><span class="identifier">B</span><span class="special">&gt;</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">&lt;</span><span class="identifier">B</span><span class="special">&gt;</span></code>.
</p>
<pre class="programlisting"><span class="identifier">policy</span><span class="special">&lt;...&gt;::</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">&lt;</span><span class="identifier">B</span><span class="special">&gt;</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">&lt;</span><span class="identifier">B</span><span class="special">&gt;</span></code>.
</p>
<pre class="programlisting"><span class="identifier">policy</span><span class="special">&lt;...&gt;::</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">&lt;&gt;</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">&lt;...&gt;::</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">&lt;</span><span class="identifier">B</span><span class="special">&gt;</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">&lt;</span><span class="identifier">B</span><span class="special">&gt;</span></code>.
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;...</span><span class="identifier">argument</span> <span class="identifier">list</span><span class="special">...&gt;</span>
<span class="keyword">typename</span> <span class="identifier">normalise</span><span class="special">&lt;</span><span class="identifier">policy</span><span class="special">&lt;&gt;,</span> <span class="identifier">A1</span><span class="special">&gt;::</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">&lt;</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">&gt;</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">&lt;</span><span class="identifier">A</span><span class="special">,</span><span class="identifier">B</span><span class="special">&gt;</span></code>
or <code class="computeroutput"><span class="identifier">policy</span><span class="special">&lt;</span><span class="identifier">B</span><span class="special">,</span><span class="identifier">A</span><span class="special">&gt;</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>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2006 , 2007, 2008, 2009, 2010 John Maddock, Paul A. Bristow,
Hubert Holin, Xiaogang Zhang, Bruno Lalande, Johan R&#229;de, 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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