http://d.puremagic.com/issues/show_bug.cgi?id=11257
Summary: Allow whole implicit conversion if one or more
overlapped field could.
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: k.hara...@gmail.com
--- Comment #0 from Kenji Hara <k.hara...@gmail.com> 2013-10-14 04:00:35 PDT ---
Compiler rejects this code so the implicit conversion from const(R) to R breaks
mutable field 'stripped' const-correctness.
struct R
{
union
{
const(Object) original;
Object stripped;
}
}
void main()
{
const R cr;
R mr = cr; // Error: cannot implicitly convert expression
// (cr) of type const(R) to R
}
However, I think this is a little restricted behavior. Because qualified and
overlapped field is D-specific feature. It's mostly used for bypassing the
restriction of const qualifier. Therefore, in many case it would be protected
by private access specifier.
The feature is necessary in order to allow const(Rebindable) to Rebindable
conversion.
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