On Sun, 20 May 2018, Mattias Gaertner wrote:
On Sun, 20 May 2018 14:23:25 +0200
Sven Barth via fpc-pascal <fpc-pascal@lists.freepascal.org> wrote:
Hello together!
I'm pleased to announce that after nearly a year various extensions for
dynamic arrays have been finished. This includes the following features:
- support for array constructors using "[...]" syntax
- support for Insert(), Delete() and Concat()
- support for "+" operator
- support for dynamic array constants (and variable initializations)
:)
I hope 3.2 is coming soon.
[...]
=== code end ===
For constants the dynamic array constants adhere to the writable
constants switch $J. E.g. the following will result in an exception:
=== code begin ===
{$J-}
const
Test1: array of LongInt = (1, 2, 3);
begin
Test1[1] := 42;
end.
This seems to be inconsistent with
procedure Test(const a: TStringDynArray);
begin
a[1]:='42';
end;
Isn't it?
The const in the parameters indicates that the pointer a cannot be assigned,
but the contents can be assigned when inside the procedure.
(we can discuss whether this behaviour is logical, but I suppose we
inherited this from Delphi)
Whereas a constant is something that is eternally constant throughout the
application. Normally, a constant is something that is replaced by its
value when the compiler encounters it the sources.
So in a sense, it does not exist at runtime, hence you cannot assign to it
either.
Michael.
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