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[#5] Added additional inheritance information

closure/master
Mike Gerwitz 2011-11-10 23:02:26 -05:00
parent 322c078c5a
commit ef12444a6c
1 changed files with 48 additions and 10 deletions
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doc/classes.texi
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@ -502,17 +502,55 @@ condition that both @var{dfn\_n\^C'} and @var{dfn\_n\^C} are defined
values. values.
@var{C'} will @dfn{inherit} all public and protected members of supertype @var{C'} will @dfn{inherit} all public and protected members of supertype
@var{C}. As such, it could be said that @var{dfn\^C'} = @var{dfn\^C} + @var{C} such that @var{dfn\_n\^C'} = @var{dfn\_n\^C} for each @var{dfn\^C}. For
@var{dfn}. For any condition @var{o} of any member @var{name}, member any positive condition @var{o\_n}, member @var{dfn\_n\^C'} will be said to
@var{dfn\_name\^C'} will be said to @dfn{override} member @var{dfn\_name\^C}, @dfn{override} member @var{dfn\_n\^C}, provided that overriding member @var{n}
provided that overriding member @var{name} passes all validation rules passes all validation rules associated with the operation. A @code{protected}
associated with the operation. member may be @dfn{escalated} to @code{public}, but the reverse is untrue.
@code{private} members are invisible to subtypes.
For a condition @var{o\_name} where member @var{name} is defined as a method, it For any positive condition @var{o\_n} where member @var{n} is defined as a
is required that @var{dfn\_name\^C} be declared with the @code{virtual} keyword @emph{method}:
and that @var{dfn\_name\^C'} be declared with the @code{override} keyword.
Non-virtual methods cannot be overridden (same as the "final" keyword in @itemize
languages like Java). @item
One of the following conditions must always be true:
@itemize
@item
@var{dfn\_n\^C} is declared with the @code{virtual} keyword and
@var{dfn\_n\^C'} is declared with the @code{override} keyword.
@itemize
@item
Note that @var{dfn\_n\^C'} will not become @code{virtual} by default (unlike
languages such as C++); they must be explicitly declared as such.
@end itemize
@item
@var{dfn\_n\^C} is declared with the @code{abstract} keyword and
@var{dfn\_n\^C'} omits the @code{override} keywords.
@end itemize
@item
The argument count of method @var{dfn\_n\^C'} must be >= the argument count of
method @var{dfn\_n\^C} to permit polymorphism.
@item
A reference to super method @var{dfn\_n\^C} will be preserved and assigned to
@samp{this.__super} within context of method @var{dfn\_n\^C'}.
@item
A method is said to be @dfn{concrete} when it provides a definition and
@dfn{abstract} when it provides only a declaration.
@itemize
@item
Any method @var{n} such that @var{dfn\_n\^C} is declared @code{abstract} may
be overridden by a concrete or abstract method @var{dfn\_n\^C'}.
@item
A method @var{n} may @emph{not} be declared @code{abstract} if @var{dfn\_n\^C}
is concrete.
@end itemize
@item
Member @var{dfn\_n\^C} must be a method.
@end itemize
Members that have been declared @code{static} cannot be overridden
(@pxref{Static Members}).
@subsection Discussion @subsection Discussion
Inheritance can be a touchy subject among many Object-Oriented developers due to Inheritance can be a touchy subject among many Object-Oriented developers due to