Re: [boost] Feature macro for putting things in the std namespace

Agustín K-ballo Bergé writes:

If by "this" you mean defining stuff elsewhere and importing into namespace `std` via `using` then no, that is not allowed by the C++ standard.

Where do you see this? A lot of stuff from both libc++ and libstdc++ are also defined like this. All cXXX headers define their symbols in the global namespace, then put them into ::std with a using.