Slot
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* [[FinalSlot]] | * [[FinalSlot]] | ||
| - | * [[ | + | * [[SimpleSlot]] |
| + | * [[GuardedSlot]] | ||
| + | * [[CoercedSlot]] | ||
* [[LamportSlot]] | * [[LamportSlot]] | ||
==Protocol== | ==Protocol== | ||
| - | + | {{instance msgdoc|get|0||[[any]]}} | |
| - | + | ||
Returns the current value of this slot. | Returns the current value of this slot. | ||
| - | + | {{instance msgdoc|put|1|<var>newValue</var> :[[any]]|[[void]]}} | |
| - | + | ||
Sets the current value to the (possibly coerced) provided value, if appropriate for this type of slot; [[throw]]s if not allowed. | Sets the current value to the (possibly coerced) provided value, if appropriate for this type of slot; [[throw]]s if not allowed. | ||
| - | + | {{instance msgdoc|isFinal|0||[[boolean]]}} | |
| - | + | ||
Says whether the Slot acts like a [[FinalSlot]] -- successive <code>[[#get/0|get]]()</code>s on the same slot will always give the same value. | Says whether the Slot acts like a [[FinalSlot]] -- successive <code>[[#get/0|get]]()</code>s on the same slot will always give the same value. | ||
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Note that final implies read-only, but read-only does not imply final. | Note that final implies read-only, but read-only does not imply final. | ||
| - | + | {{instance msgdoc|readOnly|0||[[Slot]]}} | |
| - | + | ||
Returns a facet allowing get/0 but not put/1. | Returns a facet allowing get/0 but not put/1. | ||
[[Category:Protocols]] | [[Category:Protocols]] | ||
| + | [[Category:ELib specification]] | ||
Latest revision as of 05:00, 8 November 2008
A Slot is an object which provides the behavior of the binding of a noun. "&" in the E language allows working with slots.
A slot can also be considered a zero-dimensional collection, i.e. one which has exactly one element.
Contents |
Notable implementations
Protocol
get/0
- Signature: get() :any
Returns the current value of this slot.
put/1
Sets the current value to the (possibly coerced) provided value, if appropriate for this type of slot; throws if not allowed.
isFinal/0
- Signature: isFinal() :boolean
Says whether the Slot acts like a FinalSlot -- successive get()s on the same slot will always give the same value.
Note that final implies read-only, but read-only does not imply final.
readOnly/0
- Signature: readOnly() :Slot
Returns a facet allowing get/0 but not put/1.
