Subject: Re: [boost] C++17 detection
From: Stephan T. Lavavej (stl_at_[hidden])
Date: 2017-09-12 00:15:27
> __cplusplus gives you the claimed conformance level of the compiler,
> which is usually (though not necessarily) in agreement with the STL.
> But that doesn't do you a lot of good as it's a big catch-all
> (and at least in the case of MSVC lags behind the actual individual feature support).
That's intentional. If we were to update __cplusplus's value before completing C++11 (not to mention C++14/17), the Internet would riot.
_MSVC_LANG reports the value that __cplusplus would have (in the recent versions that support /std:c++14, /std:c++latest, and now /std:c++17). Note that it isn't a claim to implement literally everything in the corresponding Standard.
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