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clu

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clu


  1  definition  found 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
 
  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, 
  {cluster}s  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  conversion}s.  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}. 
 
  {Exception}s  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  variable}s  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 
  (ftp://pion.lcs.mit.edu/pub/clu/)}.  {Portable  version 
  (ftp://mintaka.lcs.mit.edu/pub/dcurtis/)}. 
 
  (1994-12-16) 
 
 




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