[patch] implement std::experimental::any

[Jonathan Wakely]

On 10/06/14 14:44 +0100, Jonathan Wakely wrote:
>This patch implements std::experimental::any from the Fundamentals TS,
>including small-object optimisation, uses-allocator construction and
>partial support for -fno-rtti (I should probably disable the
>allocator-extended constructors when RTTI is disabled, or any_cast
>doesn't work).
>
>The allocator-extended copy constructor is not implemented, I don't
>think it's possible!
>
>It could probably do with some more tests before I commit it, but
>posting for comments as I've had it sitting in my tree for some time
>and I might as well share it.

Here's what I'm committing, with more tests, improved -fno-rtti
handling and complete Doxygen comments (which are currently useless
because doc/doxygen/user.cfg.in defines __cplusplus to 2001103L so we
don't generate docs for any C++14 or TS components).

Tested x86_64-linux, committed to trunk.

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