Kevin Reid: fix wp link

2009-07-25T13:32:38Z

fix wp link

New page

Sameness is an [http://en.wikipedia.org/wiki/Equivalence_relation equivalence relation] such that any two [[reference]]s which “are the same” are not distinguishable by any [[unprivileged]] client. The [[Equalizer]] object provides the sameness predicate to E programs.

For purposes of sameness, all references are either [[selfish]], [[selfless]], or [[unresolved]].

==[[Selfish]]==

Selfish objects have specific identities defined by the event of their creation. In most implementations this is "pointer equality". {{XXX|Explain better for the casual programmer.}}

==[[Selfless]]==

Selfless objects have identities defined by their “components”; a selfless object is the same as any other object made of the same components. See [[Selfless]] for more details on this.

==[[Unresolved]]==

Unresolved references (promises) are the same as any promise which will necessarily have the same [[resolution]], i.e. a promise is the same as itself, another promise that is resolved to it, and the promise which it is resolved to, and so on transitively.

A promise is ''not different from'' any other reference; such sameness ''is not yet defined''.

The tools to work with this are [[Equalizer#sameYet/2]] and [[TraversalKey]].

[[Category:ELib specification]]

Kevin Reid: explain types of sameness

2009-07-25T13:27:08Z

explain types of sameness

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-	Sameness is an [~~http~~:~~//en.wikipedia.org/wiki/Equivalence_relation~~ equivalence relation] such that any two [[reference]]s which “are the same” are not distinguishable by any [[unprivileged]] client. The [[Equalizer]] object provides the sameness predicate to E programs.	+	Sameness is an [[wp:equivalence relation]] such that any two [[reference]]s which “are the same” are not distinguishable by any [[unprivileged]] client. The [[Equalizer]] object provides the sameness predicate to E programs.

	For purposes of sameness, all references are either [[selfish]], [[selfless]], or [[unresolved]].		For purposes of sameness, all references are either [[selfish]], [[selfless]], or [[unresolved]].

Sameness - Revision history

Kevin Reid: fix wp link

Kevin Reid: explain types of sameness