Structure Field Offset Measurement
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You can use `offsetof' to measure the location within a structure
type of a particular structure member.
- Macro: size_t offsetof (TYPE, MEMBER)
This expands to a integer constant expression that is the offset
of the structure member named MEMBER in a the structure type TYPE.
For example, `offsetof (struct s, elem)' is the offset, in bytes,
of the member `elem' in a `struct s'.
This macro won't work if MEMBER is a bit field; you get an error
from the C compiler in that case.
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