Anonymous user
Singleton: Difference between revisions
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{{task|Object oriented}}
{{task|Object oriented}}A Global Singleton is a class of which only one instance exists within a program. Any attempt to use non-static members of the class involves performing operations on this one instance.▼
A Global Singleton is a class of which only one instance exists within a program.
▲
=={{header|ActionScript}}==
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x.wait ; y.wait ; z.wait ;
}</lang>
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<pre>>>Mary come in.
Calling Dealer...
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}
}</lang>
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<pre>invoking method of a singleton class</pre>
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</lang>
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<pre style="height:30ex;overflow:scroll">
main____________:0000000001:@035a8767|-
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(dm message2> ()
(prinl "This is method 2 on " This) )</lang>
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<pre>: (message1> '+Singleton)
This is method 1 on +Singleton
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=={{header|Slate}}==
Clones of Oddball themselves may not be cloned.
Methods and slots may still be defined on them:
<lang slate>define: #Singleton &builder: [Oddball clone]</lang>
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}
}</lang>
Demonstrating in an interactive shell:
<lang tcl>% set a [example new]
::oo::Obj20
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=={{header|zkl}}==
A class declared static only has one instance, ever.
However, a class with the same name & structure could be created in another scope.
<lang zkl>class [static] Borg{ var v }
b1 := Borg; b2 := Borg();
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