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Clarion - SORT Comparer Function example
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PROGRAM | |
MAP | |
_Comparer(*GROUP a, *GROUP b), SIGNED | |
_Comparer2(*GROUP a, *GROUP b), SIGNED | |
_Comparer3(*GR A, *GR B),SIGNED !<-- typed groups | |
END | |
ct CLASS, TYPE | |
field1 STRING(1) | |
end | |
gr GROUP, TYPE | |
c &ct | |
END | |
qt QUEUE(gr), TYPE | |
END | |
q &qt | |
CODE | |
q &= new qt | |
clear(q); q.c &= new ct; q.c.field1 = 'd'; add(q) | |
clear(q); q.c &= new ct; q.c.field1 = 'z'; add(q) | |
clear(q); q.c &= new ct; q.c.field1 = 'q'; add(q) | |
clear(q); q.c &= new ct; q.c.field1 = 'a'; add(q) | |
clear(q); q.c &= new ct; q.c.field1 = 'q'; add(q) | |
DO ShowQ | |
SORT(q, _Comparer3) | |
DO ShowQ | |
ShowQ ROUTINE | |
DATA | |
Msg Any | |
Ptr LONG,AUTO | |
CODE | |
LOOP Ptr = 1 TO RECORDS(Q) | |
GET(Q, Ptr) | |
Msg = Msg & '['& Ptr &'] Field1['& Q.C.Field1 &']|' | |
END | |
Message( Msg ) | |
_Comparer PROCEDURE(*GROUP A, *GROUP B) !<-- generic groups | |
AQt LIKE(Qt) | |
BQt LIKE(Qt) | |
CODE | |
AQt = A | |
BQt = B | |
IF AQt.C.Field1 < BQt.C.Field1 THEN RETURN -1 | |
ELSIF AQt.C.Field1 > BQt.C.Field1 THEN RETURN 1 | |
END | |
RETURN 0 | |
_Comparer2 PROCEDURE(*GROUP A, *GROUP B) !<-- generic groups | |
AQt &gr | |
BQt &gr | |
CODE | |
AQt &= ADDRESS(A) | |
BQt &= ADDRESS(B) | |
IF AQt.C.Field1 < BQt.C.Field1 THEN RETURN -1 | |
ELSIF AQt.C.Field1 > BQt.C.Field1 THEN RETURN 1 | |
END | |
RETURN 0 | |
_Comparer3 PROCEDURE(*GR A, *GR B) !<-- typed groups | |
CODE | |
IF A.C.Field1 < B.C.Field1 THEN RETURN -1 | |
ELSIF A.C.Field1 > B.C.Field1 THEN RETURN 1 | |
END | |
RETURN 0 |
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