On 02.03.2013 03:49, Xiangrong Fang wrote:
Hi there,
If my class constructor looks like this:
constructor TMyClass.Create(fn: string);
begin
sl := TStringList.Create;
try
fs := TFileStream.Create(fn, fmOpenRead);
except
self.Destroy;
end;
end;
No, this is a bad idea. If an exception occurs inside the constructor
the destructor will be called automatically. I don't even want to think
about what bad things could happen if you call Destroy inside the
constructor...
I create the objec like: MyInstance :=
TMyClass.Create('AnNonExistentFile'); An exception occured, I can
ensure that:
1. there is no memory leak.
There won't be a memory leak.
2. the MyInstance variable is assigned *nil*?
If you want to ensure that MyInstance is Nil you need to do it like this:
=== code begin ===
try
MyInstance := TMyClass.Create('AnNonExistentFile');
except
MyInstance := Nil;
end;
=== code end ===
Regards,
Sven
--
_______________________________________________
Lazarus mailing list
[email protected]
http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
