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An advantage of <code>NSInvocation</code> is that the target object can be modified after creation. A single <code>NSInvocation</code> can be created and then called for each of any number of targets, for instance from an observable object. An <code>NSInvocation</code> can be created from only a protocol, but it is not straightforward. See {{usurped|1=[https://web.archive.org/web/20110227215311/http://www.a-coding.com/2010/10/making-nsinvocations.html here]}}.
== In Perl ==
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