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77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
// Copyright John Maddock 2007.
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// Copyright Paul A. Bristow 2010
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// Note that this file contains quickbook mark-up as well as code
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// and comments, don't change any of the special comment mark-ups!
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#ifdef _MSC_VER
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# pragma warning (disable : 4189) // 'd' : local variable is initialized but not referenced
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#endif
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#include <iostream>
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using std::cout; using std::endl;
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#include <stdexcept>
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using std::domain_error;
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//[policy_ref_snip13
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#include <boost/math/distributions/cauchy.hpp>
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namespace myspace
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{ // using namespace boost::math::policies; // May be convenient in myspace.
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// Define a policy called my_policy to use.
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using boost::math::policies::policy;
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// In this case we want all the distribution accessor functions to compile,
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// even if they are mathematically undefined, so
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// make the policy assert_undefined.
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using boost::math::policies::assert_undefined;
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typedef policy<assert_undefined<false> > my_policy;
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// Finally apply this policy to type double.
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BOOST_MATH_DECLARE_DISTRIBUTIONS(double, my_policy)
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} // namespace myspace
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// Now we can use myspace::cauchy etc, which will use policy
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// myspace::mypolicy:
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//
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// This compiles but throws a domain error exception at runtime.
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// Caution! If you omit the try'n'catch blocks,
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// it will just silently terminate, giving no clues as to why!
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// So try'n'catch blocks are very strongly recommended.
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void test_cauchy()
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{
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try
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{
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double d = mean(myspace::cauchy()); // Cauchy does not have a mean!
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}
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catch(const std::domain_error& e)
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{
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cout << e.what() << endl;
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}
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}
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//] //[/policy_ref_snip13]
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int main()
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{
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test_cauchy();
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}
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/*
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Output:
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policy_snip_13.vcxproj -> J:\Cpp\MathToolkit\test\Math_test\Release\policy_snip_13.exe
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Error in function boost::math::mean(cauchy<double>&): The Cauchy distribution does not have a mean: the only possible return value is 1.#QNAN.
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*/
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