Bug 11761 – aa.byKey and aa.byValue are not forward ranges

Currently, associative arrays' byKey and byValue methods do not return forward ranges (although this was the intention). The isForwardRange check fails. The cause can be reduced to the following code: struct R { R save() { return this; } } void main() { R r1 = void; static assert (is(typeof(r1.save) == typeof(r1))); } The compiler complains: test.d(9): Error: static assert (is(R() == R)) is false Note the parens in "R() == R". The problem goes away, if either r1.save is replaced with r1.save(), or the save method declaration is annotated with @property (despite the -property switch not being used).

See also here, someone else got bitten by this problem too: http://forum.dlang.org/post/[email protected]

(In reply to Vladimir Panteleev from comment #0) > Currently, associative arrays' byKey and byValue methods do not return > forward ranges (although this was the intention). The isForwardRange check > fails. (In reply to hsteoh from comment #2) > https://github.com/D-Programming-Language/druntime/pull/925 Change the "Component" field because it's druntime issue.

Commit pushed to master at https://github.com/D-Programming-Language/druntime https://github.com/D-Programming-Language/druntime/commit/38eee4cdf371ca9ab49962d2dfadbfb5785d7bcb Merge pull request #925 from quickfur/issue11761 Fix 11761: aa.byKey and aa.byValue are not forward ranges.

(In reply to Vladimir Panteleev from comment #0) > The cause can be reduced to the following code: > > struct R > { > R save() { return this; } > } > > void main() > { > R r1 = void; > static assert (is(typeof(r1.save) == typeof(r1))); > } > > The compiler complains: > > test.d(9): Error: static assert (is(R() == R)) is false > > Note the parens in "R() == R". > > The problem goes away, if either r1.save is replaced with r1.save(), or the > save method declaration is annotated with @property (despite the -property > switch not being used). The compiler behavior issue is now filed in bug 13293.

Thanks. Link: issue 13293