On Tue, 15 Feb 2022, Michael Van Canneyt via fpc-pascal wrote:
On Tue, 15 Feb 2022, Ryan Joseph via fpc-pascal wrote:
On Feb 15, 2022, at 8:26 PM, Sven Barth via fpc-pascal
<fpc-pascal@lists.freepascal.org> wrote:
It's relatively "easy" to implement assigning a nested function to
function references. However assigning a nested function variable to a
function reference is much harder.
Assigning a function reference to a nested function variable is hard as
well.
I'm getting lost with the terms now I think.
If your function takes a function reference parameter and you assign it a
nested function pointer,
this is difficult? I believe this was Michaels request in that code
snippet.
Sven will need to confirm, but as I understand it:
Procedure DoDemo(aTest : TProc);
For clarity, this should be something like:
Procedure DoDemo(aTest : TProc);
begin
// Do stuff
aTest;
end;
So the below procedures are not local to DoDemo...
Michael.
Procedure MyTest;
Procedure DoSub;
begin
end;
begin
DoDemo(DoSub)
end;
is easy.
but
Procedure DoDemo(aTest : TProc);
Procedure MyTest;
Var
ASub : procedure is nested;
begin
aSub:=SomeFunctionThatReturnsANestedProc;
DoDemo(aSub);
end;
is difficult.
Michael.
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