[top] / BTrees / Interfaces / IMerge
Object with methods for merging sets, buckets, and trees.
These methods are supplied in modules that define collection classes with particular key and value types. The operations apply only to collections from the same module. For example, the IIBTree.union can only be used with IIBTree.IIBTree, IIBTree.IIBucket, IIBTree.IISet, and IIBTree.IITreeSet.
The implementing module has a value type. The IOBTree and OOBTree modules have object value type. The IIBTree and OIBTree modules have integer value types. Other modules may be defined in the future that have other value types.
The individual types are classified into set (Set and TreeSet) and mapping (Bucket and BTree) types.
There are no attributes or fields specified.
union(c1, c2)
Compute the Union of c1 and c2.
If c1 is None, then c2 is returned, otherwise, if c2 is None, then c1 is returned.
The output is a Set containing keys from the input collections.
difference(c1, c2)
Return the keys or items in c1 for which there is no key in c2.
If c1 is None, then None is returned. If c2 is None, then c1 is returned.
If neither c1 nor c2 is None, the output is a Set if c1 is a Set or TreeSet, and is a Bucket if c1 is a Bucket or BTree.
intersection(c1, c2)
Compute the intersection of c1 and c2.
If c1 is None, then c2 is returned, otherwise, if c2 is None, then c1 is returned.
The output is a Set containing matching keys from the input collections.
There are no specific adapters registered for this interface.
There are no extended adapters registered for this interface.
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