at:tutorial:objects
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
at:tutorial:objects [2007/07/02 11:24] – jorge | at:tutorial:objects [2007/07/02 13:43] – jorge | ||
---|---|---|---|
Line 48: | Line 48: | ||
Every object understands the message '' | Every object understands the message '' | ||
+ | |||
+ | AmbientTalk also provides a '' | ||
+ | |||
+ | < | ||
+ | > def clonedPoint := clone: point | ||
+ | </ | ||
===== Delegation and cloning ===== | ===== Delegation and cloning ===== | ||
Line 61: | Line 67: | ||
> def point3D := extend: point with: { | > def point3D := extend: point with: { | ||
def z := 0; | def z := 0; | ||
- | def sumofsquares() { | + | def sumOfSquares() { |
- | super.sumofsquares() + z*z | + | super^sumOfSquares() + z*z |
} | } | ||
} | } | ||
Line 72: | Line 78: | ||
> def point3D := share: point with: { | > def point3D := share: point with: { | ||
def z := 0; | def z := 0; | ||
- | def sumofsquares() { | + | def sumOfSquares() { |
- | super.sumofsquares() + z*z | + | super^sumOfSquares() + z*z |
} | } | ||
} | } | ||
Line 82: | Line 88: | ||
< | < | ||
- | > def OpenConnection | + | > def openConnection |
- | def ClosedConnection | + | > def closedConnection |
- | def Connection | + | > def connection |
- | def open() { | + | def open() { |
- | super := OpenConnection.new(); | + | super := openConnection.new(); |
}; | }; | ||
def close() { | def close() { | ||
- | super := ClosedConnection.new(); | + | super := closedConnection.new(); |
}; | }; | ||
} | } | ||
</ | </ | ||
- | ===== First-class | + | <note important> |
+ | In AmbientTalk, | ||
+ | </ | ||
+ | |||
+ | ===== First-class | ||
+ | AmbientTalk provides an explicit delegation operator '' | ||
+ | |||
+ | < | ||
+ | > def point3D := extend: point with: { | ||
+ | def z := 0; | ||
+ | def init(aX, aY, aZ) { | ||
+ | super^init(aX, | ||
+ | z := aZ; | ||
+ | }; | ||
+ | } | ||
+ | </ | ||
+ | A message sent to an object using this symbol (e.g. to the parent object in the example above) will first look for the method that matches the selector indicated in the message in this object (and its parents) and then execute the method body in the lexical scope of the message sender. | ||
===== Encapsulation ===== | ===== Encapsulation ===== |
at/tutorial/objects.txt · Last modified: 2013/05/17 20:23 by tvcutsem