Mattias Gärtner wrote:
Zitat von Jan Kowalski <bor...@gmail.com>:
I need to call ProcThreadPool.DoParallel with "local" procedure as a
parameter.
Does DoParallel allow local procedures to pass a procedural parameters ?
I get err: Error:
Incompatible type for arg no. 1: Got "<address of local
procedure(Int64,Pointer,TMultiThreadProcItem);Register>", expected
"<procedure variable type of
procedure(Int64,Pointer,TMultiThreadProcItem);Register>"
That would be really helpful.
But I don't know how to define a local procedure type:
I wouldn't be sure it's possible. It makes no sense.
My guess:
A local (nested) procedure has access to the outer(parent or
grand-parent if recursive) procedures variables (stackframe). Therefore
a local procedure must expect to be somewhere below this parent.
If it was given as a pointer to some other procedure/object, and then
called later, this may happen outside the parent. Then no such
stackframe does exist, and the local procedure can not work.
Martin
type
TMTLocalProcedure = procedure(Index: PtrInt; Data: Pointer;
Item: Pointer); ?
var
p: TMTLocalProcedure;
procedure TestWithLocalProc;
procedure LocalProc(Index: PtrInt; Data: Pointer; Item:
TMultiThreadProcItem);
begin
end;
begin
p:=...@localproc;
end;
Mattias
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