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6 Memory Access

— Accessor: %mem-ref ptr type &optional offset

Dereference a pointer offset bytes from ptr to an object for reading (or writing when used with setf) of built-in type type.


     ;; An impractical example, since time returns the time as well,
     ;; but it demonstrates %MEM-REF. Better (simple) examples wanted!
     (with-foreign-pointer (p (foreign-type-size :time))
       (foreign-funcall "time" :pointer p :time)
       (%mem-ref p :time))