offsetof
From cppreference.com
| Defined in header <stddef.h>
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| #define offsetof(type, member) /*implementation-defined*/ |
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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) | |
| C++ documentation for offsetof
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