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A quick Google search suggests that this won't work unless you also check for the MSVC version - sigh:

http://stackoverflow.com/questions/14131454/visual-studio-20...

If we changed __cplusplus before implementing every single C++11 feature, the Internet would riot.

If you're exposing __cplusplus=199711L then you really ought to continue to support #include <tr1/memory> (i.e. C++03 style). As long as you do that there's no problem and the suggested thing should work.

VC++ never used <tr1/memory> in the first place. That was purely a libstdc++ thing, and not something that TR1 or any C++ standard ever said to do.

Yep. (TR1 was published after C++03, they're totally different things.) What we did with TR1 was actually very friendly to migration - we provided std::tr1::meow in <meow> (in 2008 SP1), then in 2010 we aliased that to std::meow as C++0x was being finalized, then in 2012 we switched the True Name to std::meow and made std::tr1::meow the alias for back-compat. At some point in the future we'll probably remove the tr1 aliases completely.

For the Technical Specifications, we're following their header directory and namespace rules (<experimental/meow>).

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