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Diff for /gforth/doc/gforth.ds between versions 1.36 and 1.37

version 1.36, 1999/05/22 20:03:54 version 1.37, 1999/07/05 19:56:02
Line 7422  terminology: The derived class inherits Line 7422  terminology: The derived class inherits
 @cindex @file{objects.fs}  @cindex @file{objects.fs}
 @cindex @file{oof.fs}  @cindex @file{oof.fs}
   
 This section describes the @file{objects.fs} package. This material also has been published in @cite{Yet Another Forth Objects Package} by Anton Ertl and appeared in Forth Dimensions 19(2), pages 37--43 (@url{http://www.complang.tuwien.ac.at/forth/objects/objects.html}).  This section describes the @file{objects.fs} package. This material also
   has been published in @cite{Yet Another Forth Objects Package} by Anton
   Ertl and appeared in Forth Dimensions 19(2), pages 37--43
   (@url{http://www.complang.tuwien.ac.at/forth/objects/objects.html}).
 @c McKewan's and Zsoter's packages  @c McKewan's and Zsoter's packages
   
 This section assumes that you have read @ref{Structures}.  This section assumes that you have read @ref{Structures}.
Line 7436  case-sensitive or not, special-purpose w Line 7439  case-sensitive or not, special-purpose w
 @menu  @menu
 * Properties of the Objects model::    * Properties of the Objects model::  
 * Basic Objects Usage::           * Basic Objects Usage::         
 * The Objects base class::              * The Objects base class::      
 * Creating objects::              * Creating objects::            
 * Object-Oriented Programming Style::    * Object-Oriented Programming Style::  
 * Class Binding::                 * Class Binding::               
 * Method conveniences::           * Method conveniences::         
 * Classes and Scoping::           * Classes and Scoping::         
   * Dividing classes::            
 * Object Interfaces::             * Object Interfaces::           
 * Objects Implementation::        * Objects Implementation::      
 * Objects Glossary::              * Objects Glossary::            
Line 7794  end-class circle Line 7798  end-class circle
 @end example  @end example
   
   
 @node Classes and Scoping, Object Interfaces, Method conveniences, Objects  @node Classes and Scoping, Dividing classes, Method conveniences, Objects
 @subsubsection Classes and Scoping  @subsubsection Classes and Scoping
 @cindex classes and scoping  @cindex classes and scoping
 @cindex scoping and classes  @cindex scoping and classes
Line 7828  have several @code{protected}s without a Line 7832  have several @code{protected}s without a
 will restore the compilation word list in effect before the first of  will restore the compilation word list in effect before the first of
 these @code{protected}s.  these @code{protected}s.
   
 @node Object Interfaces, Objects Implementation, Classes and Scoping, Objects  @node Dividing classes, Object Interfaces, Classes and Scoping, Objects
   @subsubsection Dividing classes
   @cindex Dividing classes
   @cindex @code{methods}...@code{end-methods}
   
   You may want to do the definition of methods separate from the
   definition of the class, its selectors, fields, and instance variables,
   i.e., separate the implementation from the definition.  You can do this
   in the following way:
   
   @example
   graphical class
     inst-value radius
   end-class circle
   
   ... \ do some other stuff
   
   circle methods \ now we are ready
   
   m: ( x y circle -- )
     radius draw-circle ;m
   overrides draw
   
   m: ( n-radius circle -- )
     [to-inst] radius ;m
   overrides construct
   
   end-methods
   @end example
   
   You can use several @code{methods}...@code{end-methods} sections.  The
   only things you can do to the class in these sections are: defining
   methods, and overriding the class's selectors.  You must not define new
   selectors or fields.
   
   Note that you often have to override a selector before using it.  In
   particular, you usually have to override @code{construct} with a new
   method before you can invoke @code{heap-new} and friends.  E.g., you
   must not create a circle before the @code{overrides construct} sequence
   in the example above.
   
   @node Object Interfaces, Objects Implementation, Dividing classes, Objects
 @subsubsection Object Interfaces  @subsubsection Object Interfaces
 @cindex object interfaces  @cindex object interfaces
 @cindex interfaces for objects  @cindex interfaces for objects
Line 7870  bar class Line 7915  bar class
   storage implementation    storage implementation
   
 ... overrides write  ... overrides write
 ... overrides read  ... overrides read1
 ...  ...
 end-class foo  end-class foo
 @end example  @end example
Line 8050  doc---objects-end-class Line 8095  doc---objects-end-class
 doc---objects-end-class-noname  doc---objects-end-class-noname
 doc---objects-end-interface  doc---objects-end-interface
 doc---objects-end-interface-noname  doc---objects-end-interface-noname
   doc---objects-end-methods
 doc---objects-exitm  doc---objects-exitm
 doc---objects-heap-new  doc---objects-heap-new
 doc---objects-implementation  doc---objects-implementation
Line 8060  doc---objects-interface Line 8106  doc---objects-interface
 doc---objects-;m  doc---objects-;m
 doc---objects-m:  doc---objects-m:
 doc---objects-method  doc---objects-method
   doc---objects-methods
 doc---objects-object  doc---objects-object
 doc---objects-overrides  doc---objects-overrides
 doc---objects-[parent]  doc---objects-[parent]
Removed from v.1.36  
changed lines
  Added in v.1.37

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