mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-11-04 05:50:31 -05:00
77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
// Copyright John Maddock 2007.
|
|
// Copyright Paul A. Bristow 2010
|
|
// Use, modification and distribution are subject to the
|
|
// Boost Software License, Version 1.0. (See accompanying file
|
|
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
// Note that this file contains quickbook mark-up as well as code
|
|
// and comments, don't change any of the special comment mark-ups!
|
|
|
|
#ifdef _MSC_VER
|
|
# pragma warning (disable : 4189) // 'd' : local variable is initialized but not referenced
|
|
#endif
|
|
|
|
#include <iostream>
|
|
using std::cout; using std::endl;
|
|
|
|
#include <stdexcept>
|
|
using std::domain_error;
|
|
|
|
//[policy_ref_snip13
|
|
|
|
#include <boost/math/distributions/cauchy.hpp>
|
|
|
|
namespace myspace
|
|
{ // using namespace boost::math::policies; // May be convenient in myspace.
|
|
|
|
// Define a policy called my_policy to use.
|
|
using boost::math::policies::policy;
|
|
|
|
// In this case we want all the distribution accessor functions to compile,
|
|
// even if they are mathematically undefined, so
|
|
// make the policy assert_undefined.
|
|
using boost::math::policies::assert_undefined;
|
|
|
|
typedef policy<assert_undefined<false> > my_policy;
|
|
|
|
// Finally apply this policy to type double.
|
|
BOOST_MATH_DECLARE_DISTRIBUTIONS(double, my_policy)
|
|
} // namespace myspace
|
|
|
|
// Now we can use myspace::cauchy etc, which will use policy
|
|
// myspace::mypolicy:
|
|
//
|
|
// This compiles but throws a domain error exception at runtime.
|
|
// Caution! If you omit the try'n'catch blocks,
|
|
// it will just silently terminate, giving no clues as to why!
|
|
// So try'n'catch blocks are very strongly recommended.
|
|
|
|
void test_cauchy()
|
|
{
|
|
try
|
|
{
|
|
double d = mean(myspace::cauchy()); // Cauchy does not have a mean!
|
|
}
|
|
catch(const std::domain_error& e)
|
|
{
|
|
cout << e.what() << endl;
|
|
}
|
|
}
|
|
|
|
//] //[/policy_ref_snip13]
|
|
|
|
int main()
|
|
{
|
|
test_cauchy();
|
|
}
|
|
|
|
/*
|
|
|
|
Output:
|
|
|
|
policy_snip_13.vcxproj -> J:\Cpp\MathToolkit\test\Math_test\Release\policy_snip_13.exe
|
|
Error in function boost::math::mean(cauchy<double>&): The Cauchy distribution does not have a mean: the only possible return value is 1.#QNAN.
|
|
|
|
*/
|
|
|