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Re: C++17 skeleton with move semantics and std::variant
From: |
Frank Heckenbach |
Subject: |
Re: C++17 skeleton with move semantics and std::variant |
Date: |
Mon, 09 Apr 2018 18:16:35 +0200 |
Hans Åberg wrote:
> >> One can have a preprocessor macro '#if (__cplusplus == 201703L) ...',
> >> would it be of interest.
> >
> > What would it do? (BTW, I think it should be ">=".)
>
> Something like, but with suitable template arguments:
>
> #if !(__cplusplus >= 201703L)
> namespace std {
> // Workaround when C++17 <variant> not available.
> template<class T>
> using variant = some::variant<T>;
> }
> #endif
(Or simply "namespace std { using mpark::variant; }", I think.)
> > I don't want the skeleton to depend on an external library (and as I
> > said, there might be at least two candidates), so I think it's
> > better to leave it to the user. (For me, I've put mpark's variant
> > header in /usr/local/include for g++-6 to use, while g++-7 will use
> > its own variant implementation, so the parser will work with both
> > compilers without change.)
>
> Indeed, leave as it is. The idea above would leave it open for other users to
> introduce their own dependencies.
I think so. With the various "%code" blocks etc., there are enough
possibilities for users to do the above or similar.
Regards,
Frank
- C++17 skeleton with move semantics and std::variant, Frank Heckenbach, 2018/04/08
- Re: C++17 skeleton with move semantics and std::variant, Hans Åberg, 2018/04/08
- Re: C++17 skeleton with move semantics and std::variant, Frank Heckenbach, 2018/04/08
- Re: C++17 skeleton with move semantics and std::variant, Hans Åberg, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant, Frank Heckenbach, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant, Hans Åberg, 2018/04/09
- Re: *** GMX Spamverdacht *** Re: C++17 skeleton with move semantics and std::variant, Frank Heckenbach, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant, Hans Åberg, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant, Hans Åberg, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant,
Frank Heckenbach <=
- Re: C++17 skeleton with move semantics and std::variant, Hans Åberg, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant, Hans Åberg, 2018/04/09
Re: C++17 skeleton with move semantics and std::variant, Hans Åberg, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant, Frank Heckenbach, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant, Hans Åberg, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant, Frank Heckenbach, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant, Hans Åberg, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant, Frank Heckenbach, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant, Hans Åberg, 2018/04/09
- Re: C++17 skeleton with move semantics and std::variant, Frank Heckenbach, 2018/04/09