libs/multiprecision/test/math/high_prec/test_gamma.hpp

   1 // Copyright John Maddock 2006.
   2 // Copyright Paul A. Bristow 2007, 2009
   3 //  Use, modification and distribution are subject to the
   4 //  Boost Software License, Version 1.0. (See accompanying file
   5 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #define BOOST_MATH_OVERFLOW_ERROR_POLICY ignore_error
   8
   9 #include <boost/math/special_functions/gamma.hpp>
  10 #define BOOST_TEST_MAIN
  11 #include <boost/test/unit_test.hpp>
  12 #include <boost/test/floating_point_comparison.hpp>
  13 #include <boost/math/tools/stats.hpp>
  14 #include <boost/math/tools/test.hpp>
  15 #include <boost/math/constants/constants.hpp>
  16 #include <boost/type_traits/is_floating_point.hpp>
  17 #include <boost/array.hpp>
  18 #include "libs/math/test/functor.hpp"
  19
  20 #include "libs/math/test/handle_test_result.hpp"
  21 #include "../table_type.hpp"
  22
  23 #ifndef SC_
  24 #define SC_(x) static_cast<typename table_type<T>::type>(BOOST_JOIN(x, L))
  25 #endif
  26
  27 template <class Real, class T>
  28 void do_test_gamma(const T& data, const char* type_name, const char* test_name)
  29 {
  30    typedef typename T::value_type row_type;
  31    typedef Real                   value_type;
  32
  33    typedef value_type (*pg)(value_type);
  34 #if defined(BOOST_MATH_NO_DEDUCED_FUNCTION_POINTERS)
  35    pg funcp = boost::math::tgamma<value_type>;
  36 #else
  37    pg funcp = boost::math::tgamma;
  38 #endif
  39
  40    boost::math::tools::test_result<value_type> result;
  41
  42    std::cout << "Testing " << test_name << " with type " << type_name
  43              << "\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
  44
  45    //
  46    // test tgamma against data:
  47    //
  48    result = boost::math::tools::test_hetero<Real>(
  49        data,
  50        bind_func<Real>(funcp, 0),
  51        extract_result<Real>(1));
  52    handle_test_result(result, data[result.worst()], result.worst(), type_name, "boost::math::tgamma", test_name);
  53
  54    //
  55    // test lgamma against data:
  56    //
  57 #if defined(BOOST_MATH_NO_DEDUCED_FUNCTION_POINTERS)
  58    funcp = boost::math::lgamma<value_type>;
  59 #else
  60    funcp    = boost::math::lgamma;
  61 #endif
  62    result = boost::math::tools::test_hetero<Real>(
  63        data,
  64        bind_func<Real>(funcp, 0),
  65        extract_result<Real>(2));
  66    handle_test_result(result, data[result.worst()], result.worst(), type_name, "boost::math::lgamma", test_name);
  67
  68    std::cout << std::endl;
  69 }
  70
  71 template <class T>
  72 void test_gamma(T, const char* name)
  73 {
  74 #include "gamma.ipp"
  75
  76    do_test_gamma<T>(gamma, name, "random values");
  77
  78 #include "gamma_1_2.ipp"
  79
  80    do_test_gamma<T>(gamma_1_2, name, "Values near 1 and 2");
  81
  82 #include "gamma_0.ipp"
  83
  84    do_test_gamma<T>(gamma_0, name, "Values near 0");
  85
  86 #include "gamma_neg.ipp"
  87
  88    do_test_gamma<T>(gamma_neg, name, "Negative arguments");
  89 }