On Monday, 21 October 2013 at 10:41:38 UTC, Alexandr Druzhinin
wrote:
21.10.2013 17:31, Krzysztof Ciebiera пишет:
void main()
{
int a[][] = [[1,2,3]];
foreach(x; a)
{
x[0] = 0;
x ~= 4;
}
writeln(a);
}
...
&) or [0,2,3,4] (python, C++ ref). But [0,2,3]? It was
unpleasant surprise.
It's expected.
foreach(ref x; a) == C++ with &
but without ref you get the first element of a - i.e. [1, 2, 3]
then set x[0] = 0 so you get [0, 2, 3]. But when you append 4
you append it to local copy of x - because there is no 'ref'.
So, when exactly my local copy of data should be created? Now it
is created during appending element to an array (when I switch
instructions order, first append x ~= 4, then set x[0] to 0, as a
result I get [1,2,3]). Maybe I should get a warning (like when
hiding variable from outer scope)?
