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offsetof

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Defined in header <stddef.h>
#define offsetof(type, member) /*implementation-defined*/

The macro offsetof expands to a constant of type size_t, the value of which is the offset, in bytes, from the beginning of an object of specified type to its specified member, including padding if any.

[edit] See also

unsigned integer type returned by the sizeof operator
(typedef) [edit]
C++ documentation for offsetof