 | | | tree data structure | tree data structure 2004-03-11 - By Jim Cheng
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Millie Niss on eathlink wrote:
> I need a tree data structure (probably augmented to have a linked list of
> its leaves) for a program I am writing to generate poetry. I am planning to
> write a tree class, but I haven'ty used AS 2.0 much (I have done some C++,
> Java, etc. and a lot of the old Actionscript). Are there any pitfalls I
> should avoid? I gather objects are passed by refernce, so if I want a
> reference to the same object (not a cloned object) I can just say
> obj2:Object = obj1. Can I treat everything as type object and cast it when
> I need to as in C++, or do I need to keep referring to things by their
> actual class, instead of a parent class that contains all the types I am
> dealing with?
Hmm, with respect to object types in AS 2, you can cast
objects into different types as well as create non-type
checked references. In practice, AS 2 only cares about
type at compile-time. At run-time, so long the member
variable or method is there, you're fine.
Here's some tricks you can play:
<code>
// Create an instance of Foo
var fooInstance:Foo = new Foo();
// Cast it into an instance of Bar
var barInstance:Bar = Bar(foo);
// This won't work though...
var barInstance:Bar = foo;
// This is fine, since k is untyped
var k = 'some string';
k = fooInstance;
</code>
Regards,
Jim
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