Make filter_view::iterator unwrappable
#3000
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additionally, add conditional noexcepts to a lot of `_Unwrapped()`s
plus, fix reverse_iterator up with an `_Unwrapped() &&`
This is an example of what we might do; it definitely requires discussion
strega-nil
changed the title
filter_view::iterator unwrappable
cpplearner
reviewed
Aug 6, 2022
stl/inc/xutility
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| template <class _Iter> | ||
| using _Unwrapped_t = _Remove_cvref_t<decltype(_Get_unwrapped(_STD declval<_Iter>()))>; | ||
| template <class _Iter, bool _Is_unwrapped> | ||
| using _Maybe_unwrapped_t = conditional_t<_Is_unwrapped, _Unwrapped_t<_Iter>, _Remove_cvref_t<_Iter>>; |
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Can we reuse _Maybe_wrapped?
Lines 60 to 61 in 3e046a4
still need unwrappable sentinel
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Closing for now; this requires a lot of underlying machinery to be defined, and we can do that work in algorithms. |
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This is an example of what we might do; it definitely requires discussion.
In theory, with more work, fixes #2997
Based on #2991