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P1456R1 Move-only views #3453

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Nov 21, 2019
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P1456R1 Move-only views #3453

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P1456R1 Move-only views
zygoloid Nov 14, 2019
1dd384a
[range.adaptors] Extend the changes from P1456R1 to also apply to
zygoloid Nov 16, 2019
6d9db6a
[range.view] Make the requirement for constant-time move operations and
zygoloid Nov 21, 2019
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20 changes: 20 additions & 0 deletions papers/nxxxx.md
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Expand Up @@ -43,6 +43,26 @@ CWG motion 2: [P1234R5 "Paper name"](http://wg21.link/p1234r5), resolving 3 NB c

...

### LWG motion 11

The description of this paper specifies that:

> each such `base()` member [of a range adaptor, that returns a copy of the underlying view]
> be replaced to by two overloads:
> a `const`-qualified overload that requires the type of the underlying view to model CopyConstructible, and
> a `&&`-qualified overload that extracts the underlying view from the adaptor

but the wording changes omitted explicit editing instructions
to make these changes to the
`take_while_view`, `drop_view`, `drop_while_view` and `elements_view`
range adaptors, which were added by [P1035R7](http://wg21.link/p1035r7)
(2019-07 LWG Motion 23), after R0 of this paper was authored.

Consistent with the proposal in the paper,
and after consulting the paper authors and the LWG chair,
the corresponding changes were also applied to
the additional range adaptors listed above.

## Feature test macros

The feature test macro `__cpp_nontype_template_parameter_class` has been removed
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