The good news is that the old Sun workarounds aren't needed any more.
Unfortunately, there are a lot of exception test errors for
unordered_map and unordered_multimap when using libstdc++, which
probably means that std::pair isn't exception safe, which is a bit odd.
But first try using our allocator_traits implementation instead of the
standard one to see if that makes a difference. If it doesn't then I'll
probably just disable C++11 construction on this compiler, which should
fix the problem but will make allocators less useful.
So that the implementation can be moved into a single class. Still some
other methods to rename. Some methods didn't need to be renamed (e.g.
try_emplace is only used with unique keys), but still renamed for
consistency.
Also manually call the emplace macro up to 9 arguments, nicer error
messages for little effort.
Does it matter that there's no longer a nice backend for
`please_ignore_this_overload`? I don't think so, I was worried that it
would be confusing if triggered, but I'm not really aware of that ever
happening.
GCC 4.6 doesn't support using variadic arguments for a fixed length template.
There's a config macro for this, but might as well use the same code
everywhere.
Adjusts to use less arguments on Visual C++ 11, which will hopefully fix
it on that compiler. Also changed to be a little less preprocessor
heavy. I'm not sure about the __SUNPRO_CC support, hopefully recent
versions of that compiler will have better support, and can use the
normal implementation. Will check that later.
Was getting a weird test failure for Visual C++ 11,
BOOST_NO_CXX11_HDR_TUPLE is defined, so the code doesn't support
std::tuple, but BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT was also
true, and so there are functions for constructing using
std::piecewise_construct/std::tuple, which don't work.
So, I'm assuming that if BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT is true,
then there must be a std::tuple. I guess it doesn't have full C++11 support,
which is why BOOST_NO_CXX11_HDR_TUPLE is defined, but it appears to be
good enough for us. If not, this will break things.
