Actionscript - make nested fixed length Vector

I want to make a nested Vector, where i define the length of the nested vector too, someting like this:

var kb:Vector.<Vector.<Number>> = new Vector.<Vector.<Number>(4)>(4); // 4x开发者_StackOverflow社区4 vector

This line throws a compilation error - anyone knows, if this is possible?

The length of a Vector is set by a constructor argument. By using generics (type in angle brackets) you can only say that this vector is containing vectors with numbers, like this:

var outer:Vector.<Vector.<Number>> = new Vector.<Vector.<Number>>(4);

The size of nested vectors cannot be limited here since they aren't initialized. When initializing a vector which will be nested, you can do this:

var inner:Vector.<Number> = new Vector.<Number>(4);

You could also check the length of a nested vector by overriding every manipulating method of the Vector class within a custom class where you check for the pushed vector's length.