I'm fairly sure this should compile but it doesn't:
---------------------
template <typename T> struct identity
{ typedef T type; };
template <typename RT, typename... A>
int forward_call(RT (*) (A...), typename identity<A>::type...);
int g (double);
int i = forward_call(&g, 0);
-------------------------------------
The problem is the expansion
typename identity<A>::type...
which should wrap identity<An>::type around each element An of the
template pack A. I'm not entirely familiar with all the rules for
template packs yet, but I think that this should work, taking
the examples in
http://www.jot.fm/issues/issue_2008_02/article2/
into account.
Best
W.
--
Summary: [c++1x] variadic template pack problem
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: bangerth at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40155
