diff options
Diffstat (limited to 'include/libHX/defs.h')
| -rw-r--r-- | include/libHX/defs.h | 115 |
1 files changed, 1 insertions, 114 deletions
diff --git a/include/libHX/defs.h b/include/libHX/defs.h index 9d17019..31c818f 100644 --- a/include/libHX/defs.h +++ b/include/libHX/defs.h @@ -1,6 +1,7 @@ #ifndef _LIBHX_DEFS_H #define _LIBHX_DEFS_H 1 +#include <libHX/cast.h> #ifdef __cplusplus # define HXsizeof_member(type, member) sizeof(type::member) # if __cplusplus >= 201100L @@ -13,123 +14,9 @@ # include <type_traits> # define containerof(var, T, member) reinterpret_cast<std::conditional<std::is_const<std::remove_pointer<decltype(var)>::type>::value, std::add_const<T>::type, T>::type *>(reinterpret_cast<std::conditional<std::is_const<std::remove_pointer<decltype(var)>::type>::value, const char, char>::type *>(var) - offsetof(T, member)) # endif -# ifndef static_cast -# define static_cast(T, x) static_cast<T>(x) -# endif - -template<typename new_type> -static __inline__ new_type signed_cast(const char *expr) -{ - return reinterpret_cast<new_type>(expr); -} - -template<typename new_type> -static __inline__ new_type signed_cast(const signed char *expr) -{ - return reinterpret_cast<new_type>(expr); -} - -template<typename new_type> -static __inline__ new_type signed_cast(const unsigned char *expr) -{ - return reinterpret_cast<new_type>(expr); -} - -template<typename new_type> -static __inline__ new_type signed_cast(char *expr) -{ - return reinterpret_cast<new_type>(expr); -} - -template<typename new_type> -static __inline__ new_type signed_cast(signed char *expr) -{ - return reinterpret_cast<new_type>(expr); -} - -template<typename new_type> -static __inline__ new_type signed_cast(unsigned char *expr) -{ - return reinterpret_cast<new_type>(expr); -} #else # define HXsizeof_member(type, member) sizeof(((type *)NULL)->member) # define HXtypeof_member(type, member) __typeof__(((type *)NULL)->member) - /* N.B. signed_cast<> does not exist in C++. */ -# define __signed_cast_compatible(a, b) \ - __builtin_choose_expr( \ - __builtin_types_compatible_p(b, const char *) || \ - __builtin_types_compatible_p(b, const signed char *) || \ - __builtin_types_compatible_p(b, const unsigned char *), \ - /* if src has a const qualifier */ \ - __builtin_types_compatible_p(a, const char *) || \ - __builtin_types_compatible_p(a, const signed char *) || \ - __builtin_types_compatible_p(a, const unsigned char *), \ - /* and if it has none... */ \ - __builtin_types_compatible_p(a, const char *) || \ - __builtin_types_compatible_p(a, const signed char *) || \ - __builtin_types_compatible_p(a, const unsigned char *) || \ - __builtin_types_compatible_p(a, char *) || \ - __builtin_types_compatible_p(a, signed char *) || \ - __builtin_types_compatible_p(a, unsigned char *) \ - ) - -# if defined(__GNUC__) && !defined(__clang__) && !defined(signed_cast) -# define signed_cast(type, expr) ({ \ - BUILD_BUG_ON(!__signed_cast_compatible(__typeof__(type), __typeof__(expr))); \ - (type)(expr); \ - }) -# endif -# if defined(__GNUC__) && !defined(__clang__) && !defined(static_cast) -# define static_cast(type, expr) \ - ((struct { type x; }){(expr)}.x) -# endif -# if defined(__GNUC__) && !defined(__clang__) && !defined(const_cast1) - /* - * The idea starts with (in abstract notation) - * typeof deref typeof expr - * To deref something, we need an object, which we can get by - * creating a temporary aggregate, such as a union, of which - * the member is accessed and dereferenced. - * *(union { __typeof__(expr) x; }){init}.x - * union has two nice properties: - * - with an additional dummy member, we do not have to - * initialize x according to its type, which, if expr is - * an array type, may want extra braces. - * - and with that dummy member, we also avoid the ugly - * "literal 0 is implicitly convertible to a pointer". - * Unfortunately, this all requires C99 compound initializers. - * That's ok - gcc and clang only treat it as a warning even - * under strict C89 - and if you still force strict C89 on - * yourself, you have a lot to answer for either way. - */ -# define __const_cast_strip(ptrs, expr) \ - __typeof__(ptrs(union { int z; __typeof__(expr) x; }){0}.x) -# define __const_cast_p(ptrs, new_type, expr) ((new_type)( \ - (expr) + \ - BUILD_BUG_ON_EXPR(!__builtin_types_compatible_p(__const_cast_strip(ptrs, expr), __const_cast_strip(ptrs, new_type))) \ - )) -# define const_cast1(new_type, expr) __const_cast_p(*, new_type, expr) -# define const_cast2(new_type, expr) __const_cast_p(**, new_type, expr) -# define const_cast3(new_type, expr) __const_cast_p(***, new_type, expr) -# endif -# ifndef signed_cast -# define signed_cast(type, expr) ((type)(expr)) -# endif -# ifndef static_cast -# define static_cast(type, expr) ((type)(expr)) -# endif -# ifndef const_cast -# define const_cast(type, expr) ((type)(expr)) -# endif -# ifndef const_cast1 -# define const_cast1(type, expr) ((type)(expr)) -# define const_cast2(type, expr) ((type)(expr)) -# define const_cast3(type, expr) ((type)(expr)) -# endif -# ifndef reinterpret_cast -# define reinterpret_cast(type, expr) ((type)(expr)) -# endif # ifndef containerof # include <stddef.h> # define containerof(var, type, member) reinterpret_cast(type *, \ |