On 8/31/2018 1:27 PM, Stephan T. Lavavej via Boost wrote:
[Robert]
How exactly will the changing VS standard header files compile without C++17 being the 15.9.x default?
VS 2017 15.9 will *not* change the Standard mode default to C++17. It will remain at C++14 for that update.
MSVC's STL supports being compiled in both C++14 and C++17 mode; we sense the Standard mode and adapt our code accordingly. We use "if constexpr" internally to improve throughput because MSVC and Clang support it in C++14 mode with a disable-able warning. (We have an escape hatch, which we reserve the right to remove at any time without notice.)
Stephan T. Lavavej Principal Software Engineer, Visual C++ Libraries
Thank you very much for the detailed response. I will brief the development team and my superior. He likes to know about the C++ compliance details. --Robert
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