From: pbristow_at_[hidden]
Date: 2007-07-26 07:19:54
Author: pbristow
Date: 2007-07-26 07:19:53 EDT (Thu, 26 Jul 2007)
New Revision: 7543
URL: http://svn.boost.org/trac/boost/changeset/7543
Log:
updated to use policy and show use of #define policy macro (but not in boost/math/tools/user.hpp)
Text files modified:
sandbox/math_toolkit/libs/math/example/error_handling_example.cpp | 48 ++++++++++++++++++++-------------------
1 files changed, 25 insertions(+), 23 deletions(-)
Modified: sandbox/math_toolkit/libs/math/example/error_handling_example.cpp
==============================================================================
--- sandbox/math_toolkit/libs/math/example/error_handling_example.cpp (original)
+++ sandbox/math_toolkit/libs/math/example/error_handling_example.cpp 2007-07-26 07:19:53 EDT (Thu, 26 Jul 2007)
@@ -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 @@
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 @@
std::cout <<
"\n""Message from thrown exception was:\n " << e.what() << std::endl;
}
+
return 0;
} // int main()
@@ -60,19 +61,20 @@
Example error handling using Student's t function.
-Without
+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
-With
+Default behaviour without
-#define BOOST_MATH_THROW_ON_DOMAIN_ERROR
+//#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 !
+
*/