To elaborate further on Dave's final statement about "static", are the
following two statements correct?
function static void foo();
only means that *variables* declared inside foo are static by default
(and arguments may not be ref). The function itself is not static.
That is, memory is allocated for the function for each instantiation of
the class, and the method may operate on automatic values.
static function void foo();
means that the function itself is static. Memory for the function is
allocated once, regardless of how many times the class is instantiated,
and the method may not operate on automatic values.
Does this sound reasonable?
Rich, Dave wrote:
Don,
The BNF item
{ method_qualifier } means
repetition 0 or more times, and no order is implied. (but
footnote limits it to a range of 0-1 times) The BNF does not allow extern to anywhere
but where it shows in the production, at the beginning.
The use of
the keyword static as a class_item_qualifier is
independent of the use of static as part of
a task or function
declaration, so its use before or after the keyword function has
different semantics.
Dave
Does the ordering of protected/local and virtual matter?
That is,
virtual protected function void blah();
vs.
protected virtual function void blah();
It appears that at least one vendor doesn't seem to care.
As for the other keywords, I believe that extern has to go before
everything.
Are there any ordering requirements on static?
>From the LRM:
class_method
::=
{ method_qualifier } task_declaration
| { method_qualifier } function_declaration
| extern { method_qualifier } method_prototype ;
| { method_qualifier } class_constructor_declaration
| extern { method_qualifier } class_constructor_prototype
method_qualifier7 ::=
virtual
| class_item_qualifier
class_item_qualifier7 ::=
static
| protected
| local
footnote #7) In any one declaration, only one of protected or local is
allowed,
only one of rand or randc is
allowed, and static and/or virtual can appear only once.
--
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Don Mills
mills@lcdm-eng.com
www.lcdm-eng.com
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Received on Mon Sep 24 15:31:35 2007