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<title>Configuration Macros</title>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="math_toolkit.config_macros"></a><a class="link" href="config_macros.html" title="Configuration Macros">Configuration Macros</a>
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</h2></div></div></div>
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<p>
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Almost all configuration details are set up automatically by <code class="computeroutput"><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">tools</span><span class="special">\</span><span class="identifier">config</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>.
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</p>
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<p>
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In normal use, only policy configuration macros are likely to be used. See
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<a class="link" href="pol_ref.html" title="Policy Reference">policy reference</a>.
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</p>
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<p>
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For reference, information on Boost.Math macros used internally are described
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briefly below.
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</p>
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<div class="table">
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<a name="math_toolkit.config_macros.boost_math_macros"></a><p class="title"><b>Table 1.11. Boost.Math Macros</b></p>
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<div class="table-contents"><table class="table" summary="Boost.Math Macros">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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MACRO
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</p>
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</th>
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<th>
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<p>
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Notes
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS</span></code>
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</p>
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</td>
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<td>
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<p>
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Do not produce or use long double functions: this macro gets set
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when the platform's long double or standard library long double support
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is absent or buggy.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_USE_FLOAT128</span></code>
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</p>
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</td>
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<td>
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<p>
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When set the numeric constants support the <code class="computeroutput"><span class="identifier">__float128</span></code>
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data type with constants having the <code class="computeroutput"><span class="identifier">Q</span></code>
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suffix.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_DISABLE_FLOAT128</span></code>
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</p>
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</td>
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<td>
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<p>
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When set the numeric constants do not use the <code class="computeroutput"><span class="identifier">__float128</span></code>
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data type even if the compiler appears to support it.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_NO_REAL_CONCEPT_TESTS</span></code>
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</p>
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</td>
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<td>
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<p>
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Do not try to use real concept tests (hardware or software does not
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support real_concept type).
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_CONTROL_FP</span></code>
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</p>
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</td>
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<td>
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<p>
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Controls FP hardware exceptions - our tests don't support hardware
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exceptions on MSVC. May get set to something like: <code class="computeroutput"> <span class="identifier">_control87</span><span class="special">(</span><span class="identifier">MCW_EM</span><span class="special">,</span><span class="identifier">MCW_EM</span><span class="special">)</span></code>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_NO_DEDUCED_FUNCTION_POINTERS</span></code>
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</p>
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</td>
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<td>
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<p>
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This macro is used by our test cases, it is set when an assignment
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of a function template to a function pointer requires explicit template
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arguments to be provided on the function name.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_USE_C99</span></code>
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</p>
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</td>
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<td>
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<p>
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Use C99 math functions.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_NO_NATIVE_LONG_DOUBLE_FP_CLASSIFY</span></code>
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</p>
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</td>
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<td>
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<p>
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define if no native (or buggy) <code class="computeroutput"><span class="identifier">fpclassify</span><span class="special">(</span><span class="keyword">long</span> <span class="keyword">double</span><span class="special">)</span></code>
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even though the other C99 functions are present.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_SMALL_CONSTANT</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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Helper macro used in our test cases to set underflowing constants
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set to zero if this would cause compiler issues.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_BUGGY_LARGE_FLOAT_CONSTANTS</span></code>
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</p>
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</td>
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<td>
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<p>
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Set if constants too large for a float, will cause "bad"
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values to be stored in the data, rather than infinity or a suitably
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large value.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_STD_USING</span></code>
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</p>
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</td>
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<td>
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<p>
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Provides <code class="computeroutput"><span class="keyword">using</span></code> statements
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for many std:: (abs to sqrt) and boost::math (rounds, modf) functions.
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This allows these functions to be called unqualified so that if
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<a href="http://en.wikipedia.org/wiki/Argument-dependent_name_lookup" target="_top">argument-dependent
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Argument Dependent Lookup</a> fails to find a suitable overload,
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then the std:: versions will also be considered.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_FPU_EXCEPTION_GUARD</span></code>
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</p>
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</td>
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<td>
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<p>
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Used at the entrypoint to each special function to reset all FPU
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exception flags prior to internal calculations, and then merge the
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old and new exception flags on function exit. Used as a workaround
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on platforms or hardware that behave strangely if any FPU exception
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flags are set when calling standard library functions.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_INSTRUMENT</span></code>
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</p>
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</td>
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<td>
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<p>
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Define to output diagnostics for math functions. This is rather 'global'
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to Boost.Math and so coarse-grained that it will probably produce
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copious output! (Especially because full precision values are output).
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Designed primarily for internal use and development.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_INSTRUMENT_CODE</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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Output selected named variable, for example <code class="computeroutput"><span class="identifier">BOOST_MATH_INSTRUMENT_CODE</span><span class="special">(</span><span class="string">"guess = "</span>
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<span class="special"><<</span> <span class="identifier">guess</span><span class="special">)</span></code>; Used by <code class="computeroutput"><span class="identifier">BOOST_MATH_INSTRUMENT</span></code>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_INSTRUMENT_VARIABLE</span><span class="special">(</span><span class="identifier">name</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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Output selected variable, for example <code class="computeroutput"><span class="identifier">BOOST_MATH_INSTRUMENT_VARIABLE</span><span class="special">(</span><span class="identifier">result</span><span class="special">);</span></code> Used by <code class="computeroutput"><span class="identifier">BOOST_MATH_INSTRUMENT</span></code>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_INSTRUMENT_FPU</span></code>
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</p>
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</td>
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<td>
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<p>
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Output the state of the FPU's control flags.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break"><div class="table">
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<a name="math_toolkit.config_macros.boost_math_tuning"></a><p class="title"><b>Table 1.12. Boost.Math Tuning</b></p>
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<div class="table-contents"><table class="table" summary="Boost.Math Tuning">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Macros for Tuning performance options for specific compilers
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</p>
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</th>
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<th>
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<p>
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Notes
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_POLY_METHOD</span></code>
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</p>
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</td>
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<td>
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<p>
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See the <a class="link" href="tuning.html" title="Performance Tuning Macros">performance tuning section</a>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_RATIONAL_METHOD</span></code>
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</p>
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</td>
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<td>
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<p>
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See the <a class="link" href="tuning.html" title="Performance Tuning Macros">performance tuning section</a>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_MAX_POLY_ORDER</span></code>
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</p>
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</td>
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<td>
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<p>
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See the <a class="link" href="tuning.html" title="Performance Tuning Macros">performance tuning section</a>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_INT_TABLE_TYPE</span></code>
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</p>
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</td>
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<td>
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<p>
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See the <a class="link" href="tuning.html" title="Performance Tuning Macros">performance tuning section</a>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">BOOST_MATH_INT_VALUE_SUFFIX</span></code>
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</p>
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</td>
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<td>
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<p>
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Helper macro for appending the correct suffix to integer constants
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which may actually be stored as reals depending on the value of BOOST_MATH_INT_TABLE_TYPE.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break">
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</div>
|
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2006-2010, 2012-2014 Nikhar Agrawal,
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Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert
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Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Johan Råde, Gautam Sewani,
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Benjamin Sobotta, Thijs van den Berg, Daryle Walker and Xiaogang Zhang<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="compilers_overview.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="intro_pol_overview.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
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