On 25 Mar 2008, at 14:21, Joao Morais wrote:
Jonas Maebe wrote:
Using uninitialised variables is virtually always bad, regardless
of the scope. And the fact that global variables are zeroed at the
program start is afaik not defined by the Pascal standard. It's
just a side effect of the way most operating systems work.
I think I didn't get your point. What about this piece of code:
interface
function foo: tfoo;
implementation
var
_foo: tfoo;
function foo: tfoo;
begin
if not assigned(_foo) then
_foo := tfoo.create;
result := _foo;
end;
Is it safe?
It is safe on all currently supported targets (and we even go out of
our way to ensure that it keeps working if global variables are turned
into register variables), but it's still bad practice (and could in
principle break one day, although it's unlikely given the backwards
compatibility headaches that would cause).
Jonas
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