-- File MergeDefs.mesa
-- Written by Martin Newell, June 1980
-- Last updated: December 1, 1980  8:20 PM

MergeDefs: DEFINITIONS =

BEGIN

MergeValue: TYPE = LONG POINTER;

InitMerge: PUBLIC PROCEDURE [fileName: STRING];
-- Initialize merge to use file fileName

ConsolidateMerge: PUBLIC PROCEDURE;

FinishMerge: PUBLIC PROCEDURE;
-- Close files and release structures

GenMergeValue: PUBLIC PROCEDURE RETURNS[n: MergeValue];
--Generate new Merge value

Merge: PUBLIC PROCEDURE [n1,n2: MergeValue] RETURNS[r: MergeValue];
--Merge numbers n1 and n2 towards smaller of the two
--Returns resulting value of Lookup[n1] (=Lookup[n2])

Lookup: PUBLIC PROCEDURE[n1: MergeValue] RETURNS[n2: MergeValue];
--Return smallest number to which n1 has been merged, transitively closed
--Can be called before FinishMerge

Lookup2: PUBLIC PROCEDURE[n1: MergeValue] RETURNS[n2: MergeValue];
--Return smallest numerically consecutive number to which n1 has been merged
--Cannot be called before ConsolidateMerge

MergeError: PUBLIC ERROR[reason: STRING];


END.
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