meaning of cltl2
1. CLtL2 Aluminum Book CLU CLUster. An object-oriented programming language developed at MIT by Liskov et al in 1974-1975. CLU is an object-oriented language of the Pascal family designed to support data abstraction, similar to Alphard. It introduced the iterator: a coroutine yielding the elements of a data object, to be used as the sequence of values in a for loop. A CLU program consists of separately compilable procedures, clusters and iterators, no nesting. A cluster is a module naming an abstract type and its operations, its internal representation and implementation. Clusters and iterators may be generic. Supplying actual constant values for the parameters instantiates the module. There are no implicit type conversions. In a cluster, the explicit type conversions up and down change between the abstract type and the representation. There is a universal type any, and a procedure force[] to check that an object is a certain type. Objects may be mutable or immutable. Exceptions are raised using signal and handled with except. Assignment is by sharing, similar to the sharing of data objects in Lisp. Arguments are passed by call-by-sharing, similar to call-by-value, except that the arguments are objects and can be changed only if they are mutable. CLU has own variables and multiple assignment. See also Kamins interpreters, clu2c. ["CLU Reference Manual", Barbara Liskov et al, LNCS 114, Springer 1981]. E-mail: Paul R. Johnson
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