signals2 is trying to use std::get with boost::tuple

[Eric Niebler]

signals2/detail/variadic_slot_invoker.hpp has the following:

// if compiler has std::tuple use it instead of boost::tuple
// because boost::tuple does not have variadic template support at present.
#ifdef BOOST_NO_CXX11_HDR_TUPLE
#include <boost/tuple/tuple.hpp>
#define BOOST_SIGNALS2_TUPLE boost::tuple
#else
#include <tuple>
#define BOOST_SIGNALS2_TUPLE std::tuple
#endif

Then in place of boost::tuple or std::tuple, it uses BOOST_SIGNALS2_TUPLE. That's dandy, but it unconditionally uses std::get to access elements from the tuple. This naturally leads to compile failures because std::get doesn't know what a boost::tuple is.

Patch attached.

[Eric Niebler]

replace std::get with boost::get when <tuple> is not available.

[Frank Mori Hess]

Committed patch to trunk in revision 83041.

[Frank Mori Hess]

(In [83102]) Merged from trunk. Closes #8102. Closes #8103. Closes #8115.