Queue/Usage: Difference between revisions

E also has queues in the standard library such as <code>&lt;import:org.erights.e.examples.concurrency.makeQueue></code>, but they are designed for concurrency purposes and do not report emptiness but rather return a promise for the next element.

=={{header|Elena}}==

<lang elena>import system'collections.

import extensions.

[

// Create a queue and "push" items into it

var queue := Queue new.

// is thrown.

queue pop | if(:e)[ console writeLine:"Queue empty.". ].

 

=={{header|Elisa}}==