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Lazily-evaluated data structures, primarily used by Salt's loader
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Check that the function passed really exists
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A base class of dict which will lazily load keys once they are needed
TODO: negative caching? If you ask for 'foo' and it doesn't exist it will
look EVERY time unless someone calls load_all()
As of now this is left to the class which inherits from this base
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Clear the dict
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Load a single item if you have it
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Load all of them
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Whether or not the key is missing (meaning we know it's not there)
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Return the error string for a missing function.
Override this to return a more meaningfull error message if possible
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Check if the key is ttld out, then do the get
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