template<typename T, T a, T... Params>
struct max
{
static const T value = a > max<T, Params>::value ? a : max<T,
Params>::value;
};
template<typename T, T a, T b>
struct max<T, a, b>
{
static const T value = a > b ? a : b;
};
static const int value1 = max< int, 1, 2>::value;
static const int value2 = max< int, 1, 3, 5>::value;
As the initialization for value1 is accepted as valid, that should be also the
case for value2. But g++ fails with the following error:
g++-4.3.0 -std=c++0x -c -o test.o test.cpp
test.cpp: In instantiation of 'const int max<int, 1, 3, 5>::value':
test.cpp:14: instantiated from here
test.cpp:4: error: 'max<int, 1, 3, 5>::value' cannot be initialized by a
non-constant expression when being declared
g++ Version is "gcc version 4.3.0 20071123 (experimental) (GCC)"
--
Summary: [4.3] gcc doesn't accept const members of variadic
templates as const
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rbuergel at web dot de
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34219
