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Fix for std libs that don't have denorm support in numeric_limits.

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[SVN r47421]
This commit is contained in:
John Maddock
2008-07-14 16:22:03 +00:00
parent a8e2c5f910
commit 2501ff283e
2 changed files with 8 additions and 5 deletions
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2
include/boost/math/special_functions/next.hpp
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@@ -37,7 +37,7 @@ inline T get_smallest_value(mpl::false_ const&)
template <class T>
inline T get_smallest_value()
{
return get_smallest_value<T>(mpl::bool_<std::numeric_limits<T>::is_specialized && std::numeric_limits<T>::has_denorm>());
return get_smallest_value<T>(mpl::bool_<std::numeric_limits<T>::is_specialized && (std::numeric_limits<T>::has_denorm == std::denorm_present)>());
}
}

11
test/test_next.cpp
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@@ -39,8 +39,11 @@ void test_value(const T& val, const char* name)
BOOST_CHECK_EQUAL(float_distance(float_advance(val, 4), val), -4);
BOOST_CHECK_EQUAL(float_distance(float_advance(val, -4), val), 4);
BOOST_CHECK_EQUAL(float_distance(float_advance(float_next(float_next(val)), 4), float_next(float_next(val))), -4);
BOOST_CHECK_EQUAL(float_distance(float_advance(float_next(float_next(val)), -4), float_next(float_next(val))), 4);
if(std::numeric_limits<T>::is_specialized && (std::numeric_limits<T>::has_denorm == std::denorm_present))
{
BOOST_CHECK_EQUAL(float_distance(float_advance(float_next(float_next(val)), 4), float_next(float_next(val))), -4);
BOOST_CHECK_EQUAL(float_distance(float_advance(float_next(float_next(val)), -4), float_next(float_next(val))), 4);
}
}
template <class T>
@@ -60,7 +63,7 @@ void test_values(const T& val, const char* name)
test_value(-boost::math::tools::epsilon<T>(), name);
test_value(boost::math::tools::min_value<T>(), name);
test_value(-boost::math::tools::min_value<T>(), name);
if(std::numeric_limits<T>::is_specialized)
if(std::numeric_limits<T>::is_specialized && (std::numeric_limits<T>::has_denorm == std::denorm_present))
{
test_value(z, name);
test_value(-z, name);
@@ -69,7 +72,7 @@ void test_values(const T& val, const char* name)
test_value(-one, name);
test_value(two, name);
test_value(-two, name);
if(std::numeric_limits<T>::is_specialized && std::numeric_limits<T>::has_denorm)
if(std::numeric_limits<T>::is_specialized && (std::numeric_limits<T>::has_denorm == std::denorm_present))
{
test_value(std::numeric_limits<T>::denorm_min(), name);
test_value(-std::numeric_limits<T>::denorm_min(), name);