http://d.puremagic.com/issues/show_bug.cgi?id=8138
Summary: Attribute inference fails with Voldemort type
Product: D
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: major
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: jmdavisp...@gmx.com
--- Comment #0 from Jonathan M Davis <jmdavisp...@gmx.com> 2012-05-23 21:47:20
PDT ---
This stripped down code from one of my programs
import std.algorithm;
import std.range;
import std.traits;
void main()
{
ubyte[] buffer = [1, 2, 9, 7, 6];
auto filtered = filter!"true"(buffer);
auto br2 = bitReader(filtered);
}
final class BitReader(R)
if(isInputRange!R && is(ElementType!R : const ubyte))
{
this(R)(R bytes)
{
_bytes = bytes;
}
@property bool empty() const
{
return _bytes.empty;
}
R _bytes;
}
BitReader!R bitReader(R)(R r)
if(isInputRange!R && is(ElementType!R : const ubyte))
{
return new BitReader!R(r);
}
results in this compilation error:
q.d(24): Error: function
std.algorithm.filter!("true").filter!(ubyte[]).filter.Result.empty () is not
callable using argument types (
If empty is changed to mutable, the code compiles just fine, but if it's either
const or inout, it fails. Given that the empty that filter's Result's empty is
calling is std.array.empty (whose parameter is in), filter's Result's empty
should be inferred as const, but it appears that it's not, since my class'
empty can't be const due to the call to filter's Result's empty.
My _guess_ would be that the problem stems from the fact that Result isn't
templated (rather filter is templated, and Result is generated as part of that
template), but I don't know. Regarldess, this is a major problem for constness
and Voldemort types.
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