Simple signal fails to compile using clang with -std=c++11

[beeblebrox42@…]

This test case fails to build using clang 3.0 and boost 1.55:

#include <boost/signals2/signal.hpp>

  int main()
  {
    boost::signals2::signal<void()> s;
    s();
  }

Error:

In file included from scratch.cpp:1:
In file included from /usr/include/boost/signals2/signal.hpp:38:
In file included from /usr/include/boost/signals2/variadic_signal.hpp:21:
/usr/include/boost/signals2/detail/variadic_slot_invoker.hpp:81:18: error: call
      to member function 'm_invoke' is ambiguous
          return m_invoke(resolver, func, indices_type(), args);
                 ^~~~~~~~

This is the same test case as #8260 which was marked a duplicate of #8102 and fixed in 1.54. Note that this test case results in a different error in 1.55.

[beeblebrox42@…]

Simple test case demonstrating issue in clang 3.0: clang++ -std=c++11 scratch.cpp

[beeblebrox42@…]

Error output

[Frank Mori Hess]

Have you tried a newer version of clang? I'm inclined to just blame this on clang 3.0 as other compilers do not have this problem even when variadic templates are being used.

[anonymous]

I was able to find an upgrade for Ubuntu Precise to clang 3.3. It works.

[Frank Mori Hess]

This may work now on the develop branch, even with the buggy version of clang.