[PATCH] add __is_constructible to the list of features queryable by __has_feature

[Richard Smith]

I seem to recall someone suggesting that we move away from using
__has_feature for these checks.

On Mon, Mar 17, 2014 at 1:36 PM, Marshall Clow <mclow.lists at gmail.com>wrote:

> Note: Clang already implements "__is_constructible" - this just makes it
> checkable.
> With this check I can use it in libc++.
>
> -- Marshall
>
>
> Index: lib/Lex/PPMacroExpansion.cpp
> ===================================================================
> --- lib/Lex/PPMacroExpansion.cpp        (revision 204039)
> +++ lib/Lex/PPMacroExpansion.cpp        (working copy)
> @@ -989,6 +989,7 @@
>             .Case("is_sealed", LangOpts.MicrosoftExt)
>             .Case("is_trivial", LangOpts.CPlusPlus)
>             .Case("is_trivially_assignable", LangOpts.CPlusPlus)
> +           .Case("is_constructible", LangOpts.CPlusPlus)
>             .Case("is_trivially_constructible", LangOpts.CPlusPlus)
>             .Case("is_trivially_copyable", LangOpts.CPlusPlus)
>             .Case("is_union", LangOpts.CPlusPlus)
> Index: test/Lexer/has_feature_type_traits.cpp
> ===================================================================
> --- test/Lexer/has_feature_type_traits.cpp      (revision 204039)
> +++ test/Lexer/has_feature_type_traits.cpp      (working copy)
> @@ -100,6 +100,11 @@
>  #endif
>  // CHECK: int is_standard_layout();
>
> +#if __has_feature(is_constructible)
> +int is_constructible();
> +#endif
> +// CHECK: int is_constructible();
> +
>  #if __has_feature(is_trivially_copyable)
>  int is_trivially_copyable();
>  #endif
>
>
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