GBBopen 1.4 Reference -- atomic-delete

atomic-delete

atomic-delete item place &key from-end test test-not start end count key => sequence [Macro]

Purpose
As an atomic operation, set place to the sequence in place from which the elements that satisfy the test have been removed.

Package :portable-threads

Module :portable-threads

Arguments and values

item		An object
place		A form which is suitable for use as a generalized reference that contains a proper sequence
from-end		A generalized boolean (default is `nil`)
test		A function of two arguments that returns a generalized boolean (default is `#'eql`)
test-not		A function of two arguments that returns a generalized boolean (use of `:test-not` is deprecated)
start		Starting index into `sequence` (default is `0`)
end		Ending index into `sequence` (default is `nil`, meaning end of `sequence`)
count		An integer or `nil` (default is `nil`)
key		A function of one argument, or `nil` (default is `nil`)
sequence		A sequence

Returns
The sequence in place from which the elements that satisfy the test have been removed.

Description
Replaces place with the sequence in place from which elements that satisfy the test have been deleted. The supplied place sequence may be modified in constructing the result; however, modification of the sequence itself is not guaranteed.

Specifying a from-end value of true matters only when the count is provided, and in that case only the rightmost count elements satisfying the test are deleted.

Example

  > list
  (1 2 3)
  > (atomic-delete 2 list)
  (2 3)
  > list
  (2 3)
  >

The GBBopen Project

atomic-delete