http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54665
Bug #: 54665
Summary: [C++11] template alias to template does not work
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: mw_tr...@users.sourceforge.net
Template aliases, as described in N2258[1], are not fully implemented.
Specifically, they do not work if the type being aliased is itself a template.
Simple test case (taken from Wikipedia[2]):
template <typename First, typename Second, int Third>
class SomeType;
class OtherType;
template <typename Second>
using TypedefName = typename SomeType<OtherType, Second, 5>;
int main()
{
return 0;
}
This fails to compile with the error:
$ gcc -std=c++11 template-alias.cpp
template-alias.cpp:6:30: error: expected nested-name-specifier
[1] http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf
[2] http://en.wikipedia.org/wiki/C++11#Alias_templates
