projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| cb323159 A |
1 | #ifndef _OS_CPP_UTIL_H |
| 2 | #define _OS_CPP_UTIL_H | |
| 3 | ||
| 4 | #include <sys/cdefs.h> | |
| 5 | ||
| 6 | #if __has_feature(cxx_nullptr) && __has_feature(cxx_decltype) | |
| 7 | # define OS_HAS_NULLPTR 1 | |
| 8 | #endif | |
| 9 | ||
| 10 | #if __has_feature(cxx_rvalue_references) || __has_extension(cxx_rvalue_references) | |
| 11 | # define OS_HAS_RVALUE_REFERENCES 1 | |
| 12 | #endif | |
| 13 | ||
| 14 | namespace os { | |
| 15 | #if OS_HAS_NULLPTR | |
| 16 | typedef decltype(nullptr) nullptr_t; | |
| 17 | #endif | |
| 18 | ||
| 19 | /* | |
| 20 | * Reference removal | |
| 21 | */ | |
| 22 | ||
| 23 | template <class _T> struct remove_reference {typedef _T type;}; | |
| 24 | template <class _T> struct remove_reference<_T&> {typedef _T type;}; | |
| 25 | template <class _T> struct remove_reference<_T &&> {typedef _T type;}; | |
| 26 | template <class _T> using remove_reference_t = typename remove_reference<_T>::type; | |
| 27 | ||
| 28 | /* | |
| 29 | * Const removal | |
| 30 | */ | |
| 31 | ||
| 32 | template <class _T> struct remove_const {typedef _T type;}; | |
| 33 | template <class _T> struct remove_const<const _T> {typedef _T type;}; | |
| 34 | template <class _T> using remove_const_t = typename remove_const<_T>::type; | |
| 35 | ||
| 36 | /* | |
| 37 | * Move | |
| 38 | */ | |
| 39 | ||
| 40 | template <class _T> | |
| 41 | inline typename remove_reference<_T>::type && | |
| 42 | move(_T && _t) | |
| 43 | { | |
| 44 | typedef typename os::remove_reference<_T>::type _U; | |
| 45 | return static_cast<_U &&>(_t); | |
| 46 | } | |
| 47 | } | |
| 48 | ||
| 49 | #endif /* _OS_CPP_UTIL_H */ |