http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50442
Bug #: 50442
Summary: Constructing T from implicit conversion to T&
ambiguous in C++0x mode, not C++98
Classification: Unclassified
Product: gcc
Version: 4.6.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: za...@panix.com
This test case ...
template <typename T> struct MoveRef { operator T& () {} };
template <typename T> MoveRef <T> Move(T&) {}
struct Thing {};
Thing foo(const Thing* p) { return Thing(Move(*p)); }
... generates these diagnostics from g++ 4.6.1 in c++0x/gnu++0x mode, but not
in c++98/gnu++98 mode:
t.cc: In function ‘Thing foo(const Thing*)’:
t.cc:4:50: error: call of overloaded ‘Thing(MoveRef<const Thing>)’ is ambiguous
t.cc:4:50: note: candidates are:
t.cc:3:8: note: constexpr Thing::Thing(const Thing&)
t.cc:3:8: note: constexpr Thing::Thing(Thing&&)
This is a regression from g++ 4.5.x and earlier.
