By Barbara Liskov, Russell Atkinson, Toby Bloom, Eliot Moss, J. Craig Schaffert, Robert Scheifler, Alan Snyder (auth.)
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Extra info for CLU Reference Manual
10 Record Types A record is a mutable collection of one or more named objects. The names are called selectors, and the objects are called components. Different components may have different types. A record type specification has the form record [ field_spec . . ] where field_spec ::---- name, ... : type_spec Selectors must be unique within a specification, but the ordering and grouping of selectors is unimportant. 10 record[last, first, middle: string, age: int] record[first, middle, last: string, age: int] record[last: string, age: int, first, middle: string] A record is created using a record constructor.
The number of variables must equal the number of objects returned, no variable may occur more than once, and the type of each variable must include the corresponding return type of the invoked procedure. 9) are not allowed. 3 Invocation Invocation is the other fundamental action of CLU. 2. However, up to and including passing of arguments, the two are the same. Invocations take the form: primary ( [ expression . . ] ) A primary is a slightly restricted form of expression, which includes variables and routine names, among other things.
The real work is done by the simple statements: assignment and invocation. 1 below. 2. The syntax of CLU is defined to permit a control statement to control a group of equates, declarations, and statements rather than just a single statement. 1. No special terminator is needed to signify the end of a body; reserved words used in the various compound statements serve to delimit the bodies. 3. 4. 5, as are some special statements that control termination of a single iteration or a single loop. 6.