http://bugs.llvm.org/show_bug.cgi?id=32605
Bug ID: 32605
Summary: common_type<T> is not SFINAE-friendly
Product: libc++
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: rs2...@gmail.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
The current implementation
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS common_type<_Tp>
{
typedef typename common_type<_Tp, _Tp>::type type;
};
is incorrect, because common_type<_Tp, _Tp>::type need not exist, in which case
the current implementation will cause a hard error. This is the case for
abominable function types (although they currently fail due to a separate bug
in std::decay), and user-defined specializations may also fail to supply a
::type member. P0548 requires this case to be SFINAE-friendly.
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