03.03.2013 2:22, Sven Barth пишет:
On 02.03.2013 20:55, Sven Barth wrote:
Also there are open questions which require brainstorm:
1. Does Pascal needs other implementation of closures which is different
from anonymous methods implementation?
I would say no. After all the method implementation itself stays the
same, but the captured variables should be different. Or what does this
print:
I've now read through your PDF and somehow I'd like to have a better
implementation in FPC. Let's consider the following code (Note: I've
never used anonymous methods yet, so this is what I naively would expect):
=== code begin ===
var
i: LongInt;
SomeProc1, SomeProc2: reference to procedure;
begin
i := 42;
SomeProc1 := procedure
begin
Writeln('Proc1: ' + i);
end;
i := 21;
SomeProc2 := procedure
begin
Writeln('Proc2: ' + i);
end;
SomeProc1;
SomeProc2;
end;
=== code end ===
The output I'd expect here is the following:
=== output begin ===
42
21
=== output end ===
But if I've understood you correctly I'll get the following instead:
=== output begin ===
21
21
BTW closurs in c++ support both cases (capture by value and by reference).
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