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updated to use policy and show use of #define policy macro (but not in boost/math/tools/user.hpp)

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[SVN r7543]
This commit is contained in:
Paul A. Bristow
2007-07-26 11:19:53 +00:00
parent 151430e1dd
commit 5b88c8feef
1 changed files with 28 additions and 26 deletions
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54
example/error_handling_example.cpp
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@@ -1,6 +1,6 @@
// example_error_handling.cpp
// Copyright Paul A. Bristow 2006.
// Copyright Paul A. Bristow 2007.
// Copyright John Maddock 2006.
// Use, modification and distribution are subject to the
@@ -8,25 +8,22 @@
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)
// Uncomment these line(s) to enable throw on errors.
#define BOOST_MATH_THROW_ON_DOMAIN_ERROR
//#define BOOST_MATH_THROW_ON_OVERFLOW_ERROR
//#define BOOST_MATH_THROW_ON_OVERFLOW_ERROR
//#define BOOST_MATH_THROW_ON_UNDERFLOW_ERROR
//#define BOOST_MATH_THROW_ON_DENORM_ERROR
// Shows use of macro definition to change policy for
// domain_error - negative degrees of freedom argument
// for student's t distribution CDF.
// Uncomment this line to see the effect of changing policy.
// #define BOOST_MATH_DOMAIN_ERROR_POLICY ignore_error
// Note that these policy #defines MUST preceed the #include of
// any boost/math #includes.
// If placed after, they will have no effect!
// warning C4005: 'BOOST_MATH_OVERFLOW_ERROR_POLICY' : macro redefinition
// is a warning that it will NOT have the desired effect.
// Boost
#include <boost/math/distributions/students_t.hpp>
using boost::math::students_t; // Probability of students_t(df, t).
#include <boost/math/tools/error_handling.hpp> // for domain_error.
using ::boost::math::tools::domain_error;
using ::boost::math::tools::pole_error;
using ::boost::math::tools::overflow_error;
using ::boost::math::tools::underflow_error;
using ::boost::math::tools::denorm_error;
using ::boost::math::tools::logic_error;
// std
#include <iostream>
using std::cout;
@@ -40,8 +37,11 @@ int main()
cout << "Example error handling using Student's t function. " << endl;
double degrees_of_freedom = -1; double t = -1.; // Bad arguments!
// If we use
// cout << "Probability of Student's t is " << cdf(students_t(-1), -1) << endl;
// Will terminate/abort if #define BOOST_MATH_THROW_ON_DOMAIN_ERROR without try & catch.
// Will terminate/abort (without try & catch blocks)
// if BOOST_MATH_DOMAIN_ERROR_POLICY has the default value throw_on_error.
try
{
cout << "Probability of Student's t is " << cdf(students_t(degrees_of_freedom), t) << endl;
@@ -51,6 +51,7 @@ int main()
std::cout <<
"\n""Message from thrown exception was:\n " << e.what() << std::endl;
}
return 0;
} // int main()
@@ -60,19 +61,20 @@ Output:
Example error handling using Student's t function.
Without
#define BOOST_MATH_THROW_ON_DOMAIN_ERROR
Probability of Student's t is 1.#QNAN
With
#define BOOST_MATH_THROW_ON_DOMAIN_ERROR
#define BOOST_MATH_DOMAIN_ERROR_POLICY ignore_error
Example error handling using Student's t function.
Probability of Student's t is 1.#QNAN
Default behaviour without
//#define BOOST_MATH_THROW_ON_DOMAIN_ERROR
Example error handling using Student's t function.
Message from thrown exception was:
Error in function __thiscall
boost::math::students_t_distribution<double>::students_t_distribution(double):
Degrees of freedom argument is -1, but must be > 0 !
Error in function boost::math::students_t_distribution<double>::students_t_distribution: Degrees of freedom argument is -1, but must be > 0 !
*/