It's just a convention for slot-setters to write them beginning with >>,
but that in itself has no syntactical meaning.
This is also explained on that help file:
"The setter is named >>slot and stores a value into a slot. It has stack
effect ( object value -- object )."
rien
On Wed, Nov 2, 2011 at 7:00 PM, L N <[email protected]> wrote:
>
>
> On Tue, Nov 1, 2011 at 2:09 AM, P. <[email protected]> wrote:
>
>> The article you want can be found by typing the following in the listener
>> and pressing <enter>:
>>
>> "accessors" help
>>
>>
>> A bit about objects in Factor:
>>
>> First take a look at this example from the homepage (the code sample is
>> different at each reload, keep trying):
>>
>> USING: accessors kernel math math.constants
>>
>> math.functions prettyprint ;
>>
>> IN: shapes
>>
>> TUPLE: circle radius ;
>>
>> TUPLE: rectangle width height ;
>>
>>
>> GENERIC: area ( shape -- area )
>>
>> M: circle area radius>> sq pi * ;
>>
>> M: rectangle area [ width>> ] [ height>> ] bi * ;
>>
>>
>> rectangle new 10 >>width 20 >>height area .
>>
>>
>>
>> In factor, methods and slots are logically separated from each other. If
>> you know Common Lisp and its CLOS this'll be familiar.
>> TUPLE: takes a name for the objects "class" you're defining, followed by
>> all of the slots that class of objects contains. That's how you declare a
>> "class".
>> GENERIC: takes a word name and a stack effect. That's how you declare a
>> name to be used for methods (as opposed to declaring a regular
>> word/function).
>> M: takes a "class" (something declared via TUPLE:), a method name
>> (something declared via GENERIC:), and a function body.
>>
>> Let us know if you have any more questions after browsing the docs.
>>
>> rien
>>
>
> What does >> mean?
>
> - Leonard
>
>
>
>
>
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