Records as function parameters

Records can be passed to function by value or by reference.

Records can be passed as function parameters, and can be returned from functions.

When passing records to functions with the record-name.* notation, the record is expanded, as if each individual member had been passed by value:
TYPE t_cust RECORD
            id INTEGER,
            name VARCHAR(50)
       END RECORD

MAIN
    DEFINE r t_cust
    LET r.id = 999
    LET r.name = "Mike Torme"
    CALL func1(r.*) -- Local variable r is not changed
    DISPLAY "1: ", r.id, " ", r.name
    CALL func2() RETURNING r.* -- Local variable r is changed
    DISPLAY "2: ", r.id, " ", r.name
END MAIN

FUNCTION func1(x t_cust)
    LET x.name = "Scott Finley"
END FUNCTION

FUNCTION func2()
    DEFINE x t_cust
    LET x.id = 998
    LET x.name = "Scott Finley"
    RETURN x.*
END FUNCTION
Output:
1:         999 Mike Torme
2:         998 Scott Finley
Records can be passed to functions by reference, if the function is defined with the INOUT keyword:
TYPE t_cust RECORD
            id INTEGER,
            name VARCHAR(50)
       END RECORD

MAIN
    DEFINE r t_cust
    LET r.id = 999
    LET r.name = "Mike Torme"
    CALL func1(r) -- Local variable r is changed
    DISPLAY "1: ", r.id, " ", r.name
END MAIN

FUNCTION func1(x t_cust INOUT)
    LET x.name = "Scott Finley"
END FUNCTION
Records can be passed by value to a method, when you specify only the name of the record:
TYPE t_class RECORD
            id INTEGER
       END RECORD

TYPE t_cust RECORD
            id INTEGER,
            name VARCHAR(50)
       END RECORD

MAIN
    DEFINE o t_class
    DEFINE r t_cust
    LET r.id = 999
    LET r.name = "Mike Torme"
    CALL o.meth1(r) -- Local variable r is not changed
    DISPLAY "1: ", r.id, " ", r.name
END MAIN

FUNCTION (this t_class) meth1(x t_cust)
    LET this.id = x.id
    LET x.name = "Scott Finley"
END FUNCTION
Output:
1:         999 Mike Torme

For more details, see Passing a record as parameter.