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Re: Remove deprecated std::has_trivial_xxx traits


2016-07-27 20:25 GMT+02:00 Jonathan Wakely <jwakely@redhat.com>:
> I propose that we remove the following non-standard traits in GCC 7:
>
>  /// has_trivial_default_constructor (temporary legacy)
>  template<typename _Tp>
>    struct has_trivial_default_constructor
>    : public integral_constant<bool, __has_trivial_constructor(_Tp)>
>    { } _GLIBCXX_DEPRECATED;
>
>  /// has_trivial_copy_constructor (temporary legacy)
>  template<typename _Tp>
>    struct has_trivial_copy_constructor
>    : public integral_constant<bool, __has_trivial_copy(_Tp)>
>    { } _GLIBCXX_DEPRECATED;
>
>  /// has_trivial_copy_assign (temporary legacy)
>  template<typename _Tp>
>    struct has_trivial_copy_assign
>    : public integral_constant<bool, __has_trivial_assign(_Tp)>
>    { } _GLIBCXX_DEPRECATED;
>
> They were in C++0x drafts but were removed before the final C++11
> standard, so have never been part of ISO C++. They've been deprecated
> since GCC 5.1: https://gcc.gnu.org/gcc-5/changes.html
>
> People who need that functionality can still use the built-ins
> directly, we don't need to define non-standard traits.
>
> Alternatively, we could move them to __gnu_cxx, so they don't pollute
> the namespace by default, or only define them when __STRICT_ANSI__ is
> not defined. I prefer simply removing them.

+1 for removing them.

- Daniel


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