What would the expected behavior be for pointers inside records? What if
the record is actually a linked list? Or includes classes and objects?
Do we run the constructor or no? If the record has file handles do we
attempt to recreate their state? (perhaps running assign again, and
crossing our fingers the file hasn't been deleted - which at least on
Linux is definitely possible)
On 05/16/2018 04:24 AM, denisgolovan wrote:
Doing the same conceptual thing using different syntax does not seem right as
generics, macros and other nice stuff become clumsy and too verbose.
See
//========================================================
program project1;
{$mode objfpc}
type
TRec= record
A:array of integer;
S:string;
end;
var R1,R2:TRec;
begin
SetLength(R1.A, 3);
R1.A[0]:=1;
R1.A[1]:=2;
R1.A[2]:=3;
R1.S:='123';
R2:=R1; // shallow copying <> full clone
R2.A[0]:=10;
R2.S[1]:='S';
// does not work as expected (no copy-on-write/cloning)
writeln(R1.A[0]); // prints 10
writeln(R2.A[0]); // prints 10
// works fine
writeln(R1.S[1]); // prints 1
writeln(R2.S[1]); // prints S
end.
//========================================================
BR,
Denis
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