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GENERIC MODULE Pair(E1,E2);
IMPORT Word;
REVEAL T = BRANDED REF RECORD
First:E1.T;
Second:E2.T;
END;
PROCEDURE Create(READONLY First:E1.T;
READONLY Second:E2.T):T =
BEGIN
RETURN NEW(T,First := First,Second := Second)
END Create;
PROCEDURE First(READONLY Pair:T):E1.T =
BEGIN
RETURN Pair.First
END First;
PROCEDURE Second(READONLY Pair:T):E2.T =
BEGIN
RETURN Pair.Second
END Second;
PROCEDURE Equal(READONLY a,b:T):BOOLEAN =
BEGIN
RETURN E1.Equal(a.First,b.First) AND E2.Equal(a.Second,b.Second)
END Equal;
PROCEDURE Hash(READONLY a:T):Word.T =
BEGIN
RETURN E1.Hash(a.First)
END Hash;
PROCEDURE Compare(READONLY a,b:T):[-1..1] =
BEGIN
IF E1.Compare(a.First,b.First) < 0 AND
E2.Compare(a.Second,b.Second) < 0 THEN RETURN -1
ELSIF E1.Compare(a.First,b.First) > 0 AND
E2.Compare(a.Second,b.Second) > 0 THEN RETURN 1
ELSE RETURN 0
END;
END Compare;
BEGIN
END Pair.
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