bit.ptr_flip

Flip the bit whose address is stored in ptr. Effectively *ptr;.

Signature

def ptr_flip ptr @ cleanup < bit.pointers.to_flip { ... }

Defined in bit/pointers.fj — lines 70–79 (view on GitHub).

Complexity

• Time: 2w@ + @

• Space: 2w@ + @

See the complexity glossary for what @, w, dw, dbit, n mean.

Requires init

The following must be initialised before this macro is invoked:

• bit.pointers.ptr_init

Source

Click to view the macro body

def ptr_flip ptr @ cleanup < bit.pointers.to_flip {
    wflip bit.pointers.to_flip+w, cleanup

    .pointers.set_flip_pointer ptr
    ;bit.pointers.to_flip

    pad 4
  cleanup:
    wflip bit.pointers.to_flip+w, cleanup
}

Depends on

• bit.pointers.set_flip_pointer

Used by

• bit.ptr_flip_dbit

Example uses

• bit.ptr_flip_dbit in bit/pointers.fj

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