offsetof

Retrieves the offset of a member from the beginning of its parent structure.

size_t offsetof(
      structName,
      memberName 
);

Параметры

• structName
  Name of the parent data structure.

• memberName
  Name of the member in the parent data structure for which to determine the offset.

Возвращаемое значение

offsetof returns the offset in bytes of the specified member from the beginning of its parent data structure. It is undefined for bit fields.

Заметки

The offsetof macro returns the offset in bytes of memberName from the beginning of the structure specified by structName. You can specify types with the struct keyword.

Примечание.
offsetof is not a function and cannot be described using a C prototype.

Требования

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

См. также

Основные понятия

Memory Allocation