Word:

CLU

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 Kamin's interpreters, clu2c.

["CLU Reference Manual", Barbara Liskov et al, LNCS 114, Springer 1981].

E-mail: Paul R. Johnson .

Versions for Sun and VAX/VMS. Portable version.
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clozapine
Clozaril
cloze
cloze procedure
cloze test
CLP
CLP(R)
CLP(sigma*)
CLP*
CLR
CLS
CLSF
CLSID
CLtL1
CLtL2
CLTP
-- CLU --
clu2c
Club
club car
club drug
club fungus
club head
Club law
club member
club moss
Club root
Club rush
club sandwich
club soda
club steak
Club topsail
club-head
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