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Patch from Gennadiy Rozental

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[SVN r14621]
This commit is contained in:
Dave Abrahams
2002-07-26 18:06:25 +00:00
parent 7d3864be03
commit ccf7efe620
1 changed files with 11 additions and 37 deletions
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46
include/boost/cast.hpp
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@@ -48,6 +48,7 @@
# include <typeinfo> # include <typeinfo>
# include <boost/type.hpp> # include <boost/type.hpp>
# include <boost/limits.hpp> # include <boost/limits.hpp>
# include <boost/detail/select_type.hpp>
// It has been demonstrated numerous times that MSVC 6.0 fails silently at link // It has been demonstrated numerous times that MSVC 6.0 fails silently at link
// time if you use a template function which has template parameters that don't // time if you use a template function which has template parameters that don't
@@ -125,52 +126,25 @@ namespace boost
namespace detail namespace detail
{ {
template <bool is_signed> struct numeric_min_select; template <class T>
struct signed_numeric_limits : std::numeric_limits<T>
template<> {
struct numeric_min_select<true>
{
template <class T>
struct limits : std::numeric_limits<T>
{
static inline T min() static inline T min()
# ifndef __GNUC__ // bug workaround courtesy Jens Maurer {
{ return std::numeric_limits<T>::min() >= 0
return std::numeric_limits<T>::min() >= 0
// unary minus causes integral promotion, thus the static_cast<> // unary minus causes integral promotion, thus the static_cast<>
? static_cast<T>(-std::numeric_limits<T>::max()) ? static_cast<T>(-std::numeric_limits<T>::max())
: std::numeric_limits<T>::min(); : std::numeric_limits<T>::min();
}
# else
;
# endif
}; };
};
# ifdef __GNUC__ // bug workaround courtesy Jens Maurer
template<> template<class T>
inline T numeric_min_select<true>::limits<T>::min()
{
return std::numeric_limits<T>::min() >= 0
// unary minus causes integral promotion, thus the static_cast<>
? static_cast<T>(-std::numeric_limits<T>::max())
: std::numeric_limits<T>::min();
}
# endif
template<>
struct numeric_min_select<false>
{
template <class T>
struct limits : std::numeric_limits<T> {};
}; };
// Move to namespace boost in utility.hpp? // Move to namespace boost in utility.hpp?
template <class T, bool specialized> template <class T, bool specialized>
struct fixed_numeric_limits_base struct fixed_numeric_limits_base
: public numeric_min_select< : public if_true< std::numeric_limits<T>::is_signed >
std::numeric_limits<T>::is_signed ::template then< signed_numeric_limits<T>,
>::template limits<T> std::numeric_limits<T>
>::type
{}; {};
template <class T> template <class T>