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Updated limits.hpp for BeOS support

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[SVN r9696]
This commit is contained in:
John Maddock
2001-04-03 11:26:20 +00:00
parent 5b8af31b0a
commit 1a2cff6d14
1 changed files with 16 additions and 12 deletions
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26
include/boost/detail/limits.hpp
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@@ -152,6 +152,18 @@ public:
BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_modulo, true); BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_modulo, true);
}; };
template<class __number, unsigned int __Word>
struct float_helper{
static __number __get_word() throw() {
// sizeof(long double) == 12, but only 10 bytes significant
const unsigned int _S_word[4] = { 0, 0, 0, __Word };
return *reinterpret_cast<const __number*>(
reinterpret_cast<const char *>(&_S_word)+16-
(sizeof(__number) == 12 ? 10 : sizeof(__number)));
}
};
// Base class for floating-point numbers. // Base class for floating-point numbers.
template <class __number, template <class __number,
int __Digits, int __Digits10, int __Digits, int __Digits10,
@@ -186,23 +198,15 @@ public:
denorm_indeterminate); denorm_indeterminate);
BOOST_STL_DECLARE_LIMITS_MEMBER(bool, has_denorm_loss, false); BOOST_STL_DECLARE_LIMITS_MEMBER(bool, has_denorm_loss, false);
template<unsigned int __Word>
static __number __get_word() throw() {
// sizeof(long double) == 12, but only 10 bytes significant
const unsigned int _S_word[4] = { 0, 0, 0, __Word };
return *reinterpret_cast<const __number*>(
reinterpret_cast<const char *>(&_S_word)+16-
(sizeof(__number) == 12 ? 10 : sizeof(__number)));
}
static __number infinity() throw() { static __number infinity() throw() {
return __get_word<__InfinityWord>(); return float_helper<__number, __InfinityWord>::__get_word();
} }
static __number quiet_NaN() throw() { static __number quiet_NaN() throw() {
return __get_word<__QNaNWord>(); return float_helper<__number,__QNaNWord>::__get_word();
} }
static __number signaling_NaN() throw() { static __number signaling_NaN() throw() {
return __get_word<__SNaNWord>(); return float_helper<__number,__SNaNWord>::__get_word();
} }
BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_iec559, __IsIEC559); BOOST_STL_DECLARE_LIMITS_MEMBER(bool, is_iec559, __IsIEC559);