[range.refinements] Simplify viewable_range #3563
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Since pointer types cannot model `view`, `view<decay_t<T>>` and `view<remove_cvref_t<T>>` are equivalent for a type `T`. LWG prefers `remove_cvref_t` to `decay_t` in cases where the two are equivalent.
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CaseyCarter
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* fold `range_impl_` concept back into `range` * Replace `forwarding_range_` concept with `safe_range` Drive-by: * Remove unused `#define CPP_noop` * Use `view<uncvref_t<T>>` instead of `view<decay_t<T>>` in the definition of `viewable_range` since pointers cannot model `view`. (Per the editorialish change I submitted in cplusplus/draft#3563).
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This is a normative change: while it might not affect the cases under which |
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Since pointer types cannot model
view,view<decay_t<T>>andview<remove_cvref_t<T>>are equivalent for a typeT. LWG prefersremove_cvref_ttodecay_tin cases where the two are equivalent.