https://d.puremagic.com/issues/show_bug.cgi?id=11889
Summary: std.container.Array.opIndex returns by value,
resulting in perfect storm
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Andrei Alexandrescu <[email protected]> 2014-01-10 00:20:37
PST ---
Per
http://forum.dlang.org/thread/[email protected]:
void main()
{
import std.container;
struct S
{
int i;
}
Array!S array = [ S(0) ];
array[0].i = 1;
assert(array[0].i == 1);
}
This fails because opIndex returns by value and then the lax rules of accessing
members for rvalues masquerade the member as a lvalue, which can be
subsequently assigned to.
Current stance of D is that ref results cannot be escaped (not enforced yet
statically but it will) so it's safe to return a ref.
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