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Provide a way to access the elements of an aggregate object sequentially without exposing its underlying representation . This design pattern is also known as Cursor.
Motivation: An example of an aggregate object is an instance of the List ADT. Consequently, an iterator can be used to traverse the elements of a list with a set of high-level abstract operations. These operations may be implemented within the List ADT but as Gamma...
Intent: Provides a useful 1D data structure (or container) for storing an ordered heterogeneous set of elements.
Motivation: MATLABdlT« R2009a provides the "containers.Map" data structure for storing an unordered...
The motivation for this demo is that if you have an instance (say 'a') of a custom class that subclasses 'handle', then the command 'b = a;' will produce another reference 'b' to the same object as initially referenced by 'a', effectively creating...
Intent: Ensures a class only has one instance and provide a global point of access to it .
Motivation: It's important for some classes to have exactly one instance. For example, it can be desirable to have only a single instance of a...
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