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package unionFind
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This module offers an implementation of STORE based on a simple form of mutable transactional references.
val new_store : unit -> 'a storetentatively s f runs the function f within a new transaction on the store s. If f raises an exception, then the transaction is aborted, and any updates performed by f are rolled back. Otherwise, the updates performed by f are committed.
Two transactions on a single store cannot be nested.
A cell that is created during a transaction still exists after the transaction, even if the transaction is rolled back. In that case, its content should be considered undefined.
val tentatively : 'a store -> (unit -> 'b) -> 'b