On Sun, 9 Feb 2014, Florian Klämpfl wrote:
Am 09.02.2014 18:41, schrieb Jürgen Hestermann:
So it seems there is a copy-on-write *but* only when using SetLength.
No. There is no COW, only ref. counting. SetLength just forces an unique
instance of the array if needed.
The documentation explicitly mentions that:
'Dynamic arrays are reference counted: assignment of one dynamic array-type
variable to another will let both variables point to the same array.
Contrary to ansistrings, an assignment to an element of one array will
be reflected in the other: there is no copy-on-write.'
But I have added a paragraph about the "reset ref. count" behaviour of
setlength.
Michael.
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