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<div class="titlepage"><div><div><h3 class="title">
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<a name="math_toolkit.pol_ref.pol_ref_ref"></a><a class="link" href="pol_ref_ref.html" title="Policy Class Reference">Policy Class Reference</a>
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<p>
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There's very little to say here, the <code class="computeroutput"><span class="identifier">policy</span></code>
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class is just a rag-bag compile-time container for a collection of policies:
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</p>
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<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>
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<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span>
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<span class="keyword">namespace</span> <span class="identifier">math</span><span class="special">{</span>
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<span class="keyword">namespace</span> <span class="identifier">policies</span>
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<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>
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<span class="keyword">class</span> <span class="identifier">A2</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A3</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A4</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A5</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A6</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A7</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A8</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A9</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A10</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A11</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A12</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A13</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">policy</span>
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<span class="special">{</span>
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<span class="keyword">public</span><span class="special">:</span>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<span class="special">};</span>
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<span class="keyword">template</span> <span class="special"><...</span><span class="identifier">argument</span> <span class="identifier">list</span><span class="special">...></span>
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<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>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A1</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A2</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A3</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A4</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A5</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A6</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A7</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A8</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A9</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A10</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A11</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A12</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">,</span>
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<span class="keyword">class</span> <span class="identifier">A13</span> <span class="special">=</span> <span class="identifier">default_policy</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">normalise</span>
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<span class="special">{</span>
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<span class="keyword">typedef</span> computed-from-template-arguments <span class="identifier">type</span><span class="special">;</span>
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<span class="special">};</span>
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</pre>
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<p>
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The member typedefs of class <code class="computeroutput"><span class="identifier">policy</span></code>
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are intended for internal use but are documented briefly here for the sake
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of completeness.
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</p>
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<pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">domain_error_type</span>
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</pre>
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<p>
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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>
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with the template argument to <code class="computeroutput"><span class="identifier">domain_error</span></code>
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one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code>
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enumerated values.
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</p>
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<pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">pole_error_type</span>
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</pre>
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<p>
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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>
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with the template argument to <code class="computeroutput"><span class="identifier">pole_error</span></code>
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one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code>
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enumerated values.
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</p>
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<pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">overflow_error_type</span>
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</pre>
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<p>
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||
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>
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with the template argument to <code class="computeroutput"><span class="identifier">overflow_error</span></code>
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||
one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code>
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enumerated values.
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</p>
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<pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">underflow_error_type</span>
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</pre>
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<p>
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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>
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with the template argument to <code class="computeroutput"><span class="identifier">underflow_error</span></code>
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one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code>
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enumerated values.
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</p>
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<pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">denorm_error_type</span>
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</pre>
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<p>
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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>
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with the template argument to <code class="computeroutput"><span class="identifier">denorm_error</span></code>
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one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code>
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enumerated values.
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</p>
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<pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">rounding_error_type</span>
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</pre>
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<p>
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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>
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with the template argument to <code class="computeroutput"><span class="identifier">rounding_error</span></code>
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one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code>
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enumerated values.
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</p>
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<pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">evaluation_error_type</span>
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</pre>
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<p>
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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>
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with the template argument to <code class="computeroutput"><span class="identifier">evaluation_error</span></code>
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one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code>
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enumerated values.
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</p>
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<pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">indeterminate_error_type</span>
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</pre>
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<p>
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Specifies how indeterminate result errors are handled, will be an instance
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||
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>
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with the template argument to <code class="computeroutput"><span class="identifier">indeterminate_result_error</span></code>
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one of the <code class="computeroutput"><span class="identifier">error_policy_type</span></code>
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enumerated values.
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</p>
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<pre class="programlisting"><span class="identifier">policy</span><span class="special"><...>::</span><span class="identifier">precision_type</span>
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</pre>
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<p>
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Specifies the internal precision to use in binary digits (uses zero to represent
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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
|
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in turn inherits from <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">integral_constant</span><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">N</span><span class="special">></span></code>.
|
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</p>
|
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<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>
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||
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>
|
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which in turn inherits from <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">integral_constant</span><span class="special"><</span><span class="keyword">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">std</span><span class="special">::</span><span class="identifier">integral_constant</span><span class="special"><</span><span class="keyword">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.
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||
</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">std</span><span class="special">::</span><span class="identifier">integral_constant</span><span class="special"><</span><span class="keyword">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>
|
||
<div class="copyright-footer">Copyright © 2006-2021 Nikhar Agrawal, Anton Bikineev, Matthew Borland,
|
||
Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert Holin, Bruno
|
||
Lalande, John Maddock, Evan Miller, Jeremy Murphy, Matthew Pulver, Johan Råde,
|
||
Gautam Sewani, Benjamin Sobotta, Nicholas Thompson, Thijs van den Berg, Daryle
|
||
Walker and Xiaogang Zhang<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>
|
||
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