https://bugs.llvm.org/show_bug.cgi?id=41062
Bug ID: 41062
Summary: Compile error for nested template alias
Product: clang
Version: 6.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: liwei....@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
// The code is as follows:
#include <type_traits>
using namespace std;
template <bool Add> struct Fun_;
template <>
struct Fun_<true> {
template <typename T>
using type = std::add_lvalue_reference<T>;
};
template <>
struct Fun_<false> {
template <typename T>
using type = std::remove_reference<T>;
};
template <typename T>
template <bool Add>
using Fun = typename Fun_<Add>::template type<T>;
template <typename T>
using Res_ = Fun<false>;
int main()
{
Res_<int&>::type h = 3;
return 0;
}
Gcc 7.3 could compile it, but clang 6.0 reports error as follows:
./main.cpp:20:1: error: extraneous template parameter list in alias template
declaration
using Fun = typename Fun_<Add>::template type<T>;
^
./main.cpp:23:18: error: template argument for template type parameter must be
a type
using Res_ = Fun<false>;
^~~~~
./main.cpp:18:20: note: template parameter is declared here
template <typename T>
^
./main.cpp:27:5: error: use of undeclared identifier 'Res_'
Res_<int&>::type h = 3;
^
./main.cpp:27:13: error: expected '(' for function-style cast or type
construction
Res_<int&>::type h = 3;
~~~^
./main.cpp:27:14: error: expected expression
Res_<int&>::type h = 3;
^
./main.cpp:27:17: error: no member named 'type' in the global namespace
Res_<int&>::type h = 3;
~~^
6 errors generated.
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
