diff options
Diffstat (limited to 'ruby_2_2/ccan/container_of/container_of.h')
| -rw-r--r-- | ruby_2_2/ccan/container_of/container_of.h | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/ruby_2_2/ccan/container_of/container_of.h b/ruby_2_2/ccan/container_of/container_of.h deleted file mode 100644 index ae3e1fc81f..0000000000 --- a/ruby_2_2/ccan/container_of/container_of.h +++ /dev/null @@ -1,142 +0,0 @@ -/* CC0 (Public domain) - see ccan/licenses/CC0 file for details */ -#ifndef CCAN_CONTAINER_OF_H -#define CCAN_CONTAINER_OF_H -#include "ccan/check_type/check_type.h" - -/** - * container_of - get pointer to enclosing structure - * @member_ptr: pointer to the structure member - * @containing_type: the type this member is within - * @member: the name of this member within the structure. - * - * Given a pointer to a member of a structure, this macro does pointer - * subtraction to return the pointer to the enclosing type. - * - * Example: - * struct foo { - * int fielda, fieldb; - * // ... - * }; - * struct info { - * int some_other_field; - * struct foo my_foo; - * }; - * - * static struct info *foo_to_info(struct foo *foo) - * { - * return container_of(foo, struct info, my_foo); - * } - */ -#define container_of(member_ptr, containing_type, member) \ - ((containing_type *) \ - ((char *)(member_ptr) \ - - container_off(containing_type, member)) \ - + check_types_match(*(member_ptr), ((containing_type *)0)->member)) - - -/** - * container_of_or_null - get pointer to enclosing structure, or NULL - * @member_ptr: pointer to the structure member - * @containing_type: the type this member is within - * @member: the name of this member within the structure. - * - * Given a pointer to a member of a structure, this macro does pointer - * subtraction to return the pointer to the enclosing type, unless it - * is given NULL, in which case it also returns NULL. - * - * Example: - * struct foo { - * int fielda, fieldb; - * // ... - * }; - * struct info { - * int some_other_field; - * struct foo my_foo; - * }; - * - * static struct info *foo_to_info_allowing_null(struct foo *foo) - * { - * return container_of_or_null(foo, struct info, my_foo); - * } - */ -static inline char *container_of_or_null_(void *member_ptr, size_t offset) -{ - return member_ptr ? (char *)member_ptr - offset : NULL; -} -#define container_of_or_null(member_ptr, containing_type, member) \ - ((containing_type *) \ - container_of_or_null_(member_ptr, \ - container_off(containing_type, member)) \ - + check_types_match(*(member_ptr), ((containing_type *)0)->member)) - -/** - * container_off - get offset to enclosing structure - * @containing_type: the type this member is within - * @member: the name of this member within the structure. - * - * Given a pointer to a member of a structure, this macro does - * typechecking and figures out the offset to the enclosing type. - * - * Example: - * struct foo { - * int fielda, fieldb; - * // ... - * }; - * struct info { - * int some_other_field; - * struct foo my_foo; - * }; - * - * static struct info *foo_to_info(struct foo *foo) - * { - * size_t off = container_off(struct info, my_foo); - * return (void *)((char *)foo - off); - * } - */ -#define container_off(containing_type, member) \ - offsetof(containing_type, member) - -/** - * container_of_var - get pointer to enclosing structure using a variable - * @member_ptr: pointer to the structure member - * @container_var: a pointer of same type as this member's container - * @member: the name of this member within the structure. - * - * Given a pointer to a member of a structure, this macro does pointer - * subtraction to return the pointer to the enclosing type. - * - * Example: - * static struct info *foo_to_i(struct foo *foo) - * { - * struct info *i = container_of_var(foo, i, my_foo); - * return i; - * } - */ -#if HAVE_TYPEOF -#define container_of_var(member_ptr, container_var, member) \ - container_of(member_ptr, typeof(*container_var), member) -#else -#define container_of_var(member_ptr, container_var, member) \ - ((void *)((char *)(member_ptr) - \ - container_off_var(container_var, member))) -#endif - -/** - * container_off_var - get offset of a field in enclosing structure - * @container_var: a pointer to a container structure - * @member: the name of a member within the structure. - * - * Given (any) pointer to a structure and a its member name, this - * macro does pointer subtraction to return offset of member in a - * structure memory layout. - * - */ -#if HAVE_TYPEOF -#define container_off_var(var, member) \ - container_off(typeof(*var), member) -#else -#define container_off_var(var, member) \ - ((const char *)&(var)->member - (const char *)(var)) -#endif - -#endif /* CCAN_CONTAINER_OF_H */ |