offsetof
Macro
Retrieves the offset of a member from the beginning of its parent structure.
Syntax
size_t offsetof(
structName,
memberName
);
Parameters
structName
Name of the parent data structure.
memberName
Name of the member in the parent data structure for which to determine the offset.
Return value
offsetof
returns the offset in bytes of the specified member from the beginning of its parent data structure. It's undefined for bit fields.
Remarks
The offsetof
macro returns the offset in bytes of memberName
from the beginning of the structure specified by structName
as a value of type size_t
. You can specify types with the struct
keyword.
Note
offsetof
is not a function and cannot be described using a C prototype.
Requirements
Routine | Required header |
---|---|
offsetof |
<stddef.h> |
For more compatibility information, see Compatibility.
Libraries
All versions of the C run-time libraries.
See also
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