Re: [boost] C++17 detection

On 09/10/17 23:00, Joaquín M López Muñoz via Boost wrote:

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Em 10 sept 2017, às 19:30, Robert Ramey via Boost escreveu:

How do I get ready for C++17?

I have a piece of code which requires C++14. I want to use something from C++17 but I also want my code to work now. So I have

#if C++14 being used namespace std { // implement C++ function } // std

I've looked in the documentation for Boost.Config and can't find any hints there.

You might find this technique useful:

http://bannalia.blogspot.com/2016/09/compile-time-checking-existence-of.html...

The nice thing about it is you don't depend on implementation macros that might or might not be accurate.

This doesn't say if std::is_final is functional (i.e. not bugged). Also, hijacking an unrelated class template for feature detection is kind of hacky. And I wonder how portable this is. std::is_final may actually be std::some_internal_namespace::is_final; will it be found in this case?