On Jul 20, 2010, at 7:43 PM, "rodolfo at rodsoft dot org" <gcc-bugzi...@gcc.gnu.org
> wrote:
The following code doesn't compile unless variable RUNTIME is
defined as a
"static const int" instead of an "enum":
This enum value has an anonymous type which is not valid in the
context of templates in C++03/98. It is valid in the current draft of C
++0x though. But I cannot remember if 4.5 implements that rule for -
std=gnu++0x (-std=c++0x).
#include <type_traits>
enum { RUNTIME = 0 };
// it compiles with the previous line commented out and the next
commented in
// static const int RUNTIME=0;
template <class T, class U, class EN=void> struct foo;
template <template<int> class V, int M>
struct foo<V<M>,V<M>, typename std::enable_if<M==RUNTIME ||
M==2>::type> {};
template <template<int> class V1, template<int> class V2, int M>
struct foo<V1<M>,V2<M>, typename std::enable_if<M==RUNTIME ||
M==2>::type> {};
template <int M> struct bar {};
foo<bar<2>,bar<2>> x;
--
Summary: Invalid ambiguity on partial class specialization
matching
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rodolfo at rodsoft dot org
GCC build triplet: x86_64-pc-linux-gnu
GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45012
