Hi,
What exactly is the difference (if any) between the parameter modifier
when you pass a class instance to a procedure?
In the example below, I can define foo() as follows...
procedure foo(AClass: TStringList);
or
procedure foo(var AClass: TStringList);
or
procedure foo(const AClass:
15.11.2011 13:33, Graeme Geldenhuys пишет:
Hi,
What exactly is the difference (if any) between the parameter modifier
when you pass a class instance to a procedure?
I your example there is no difference, except that var could be ~0.01%
slower
On Tue, 15 Nov 2011, Graeme Geldenhuys wrote:
Hi,
What exactly is the difference (if any) between the parameter modifier
when you pass a class instance to a procedure?
It behaves exactly the same as if you would pass a typed pointer.
Michael.
On Tuesday 15 November 2011 10.33:13 Graeme Geldenhuys wrote:
Hi,
What exactly is the difference (if any) between the parameter modifier
when you pass a class instance to a procedure?
In the example below, I can define foo() as follows...
procedure foo(AClass: TStringList);
or
Take
On 15/11/2011, Martin Schreiber mse0@g. wrote:
Thanks Martin. Extending my example by changing the body of foo() too...
AClass.Free;
AClass := TStringList.Create;
AClass.Add('inside foo');
...reveals a bit more about the differences.
procedure foo(const AClass: TStringList);
On Tuesday 15 November 2011 11.00:34 Graeme Geldenhuys wrote:
procedure foo(const AClass: TStringList);
Take a copy of the AClass instance pointer, AClass is readonly.
This one confused me a bit. I thought the whole object would be
read-only, but in fact it is just the AClass instance
