El 16/07/2018 a las 13:59, Michael Van Canneyt escribió:
On Mon, 16 Jul 2018, Santiago A. wrote:
I have some suggestions of change to freepascal syntax, just to debate
(All are backward compatible)
- Declaring variables inside blocks, and loop variables
- Autofree pointers
- Try except finally blocks
- Private declarations in implementation
some of them can be found in
https://www.codeproject.com/Articles/1252167/Delphi-Language-Progression-Suggestions
Some can be considered regressions, not progression.
autofree pointers will be available with management operators, I suppose.
probably try except finally blocks is still doable.
But declaring variables inside code blocks makes for really bad
readability and - worse - possibly error prone code.
What to do with scope rules ?
Var
C : integer;
begin
C:=1; // C is integer
// New block, hence new scope
for var c:string in List do begin
... // C is string
end;
It is a local variable to the block, the scope is the from the
declaration to the end of the block. Nevertheless, I think that
declarations should be at the beginning of the block, before any
executable statement, so the scope is the block.
Ada, has the structure
-------------
if a>b then
Declare
s:string='aaaa';
begin
<...>
end;
end if;
--------------
I just say that the nearer the variable to the place you use it, the
better. Particularly in the case of FOR loops it makes a lot of sense.
In fact, the variable shouldn't make sense before or after the loop. Why
not declare it just in the loop? Ada does it.
I don't think Ada is a language of dirty hacks.
--
Saludos
Santiago A.
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