offsetof
offsetof
Defined in header <cstddef> | ||
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#define offsetof(type, member) /*implementation-defined*/ |
The macro offsetof expands to an integral constant expression of type std::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.
If type is not a standard layout type, the behavior is undefined.