[LLVMbugs] [Bug 22242] New: Constructor inheritance with parent class alias fails for nested templates

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22242

            Bug ID: 22242
           Summary: Constructor inheritance with parent class alias fails
                    for nested templates
           Product: clang
           Version: 3.5
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: andreas.stoeckel at googlemail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Compiling the following code with clang++ -c test.cpp -std=c++11 fails with the
missleading error message

test.cpp:14:14: error: dependent using declaration resolved to type without
'typename' using Base::B;


template <class T>
class A {};

template <class T>
class B {
public:
    B(){};
};

template <class T>
class C : public B<A<T>> {
public:
    using Base = B<A<T>>;
    using Base::B; // <-- Error here
};

static const C<int> c{};


When writing one of the following, equivalent statements instead of "using
Base::B" the code compiles:

using Base::Base
using B<A<T>>::Base

The error does also not occur if A is not a templated class. The code compiles
fine with gcc 4.9. I've posted a question at stackoverflow regarding this
problem at http://stackoverflow.com/q/27954940/2188211

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