<displaced-alien> ( displacement c-ptr -- alien )
Factor handbook > C library interface > Passing data between Factor and C > Passing pointers to C functions > Alien addresses

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Vocabulary
alien

Inputs and outputs
displacementan integer
c-ptra c-ptr
aliena new alien


Word description
Creates a new alien address object, wrapping a raw memory address. The alien points to a location in memory which is offset by displacement from the address of c-ptr.

Notes
Passing a value of f for c-ptr creates an alien with an absolute address; this is how <alien> is implemented.

Passing a zero absolute address does not construct a new alien object, but instead makes the word output f.

See also
<alien>, alien-address

Definition

PRIMITIVE: <displaced-alien> ( displacement c-ptr -- alien )
flushable