GBBopen 1.5 Reference -- decf-after

decf-after

decf-after place &optional decrement => original-value [Macro]

Purpose
Decrement the value of place, returning the original value of place.

Package :gbbopen-tools

Module :gbbopen-tools

Arguments and values

place		A form which is suitable for use as a generalized reference
decrement		A number (default is `1`)
original-value		A number

Returns
The original value of place.

See also
incf-after

Examples


  > (defparameter *x* 4)
  *x*
  > (decf-after *x*)
  4 
  > *x*
  3
  > (decf-after *x* 3)
  3
  > *x*
  0
  >

Note
Declared numeric and pseudo probability versions of decf-after are also provided: decf-after&, decf-after$&, decf-after$, decf-after$$, decf-after$$$, and decf-after%.

The GBBopen Project

decf-after