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P2017R1 Conditionally borrowed ranges #4516

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merged 1 commit into from
Mar 9, 2021
Merged

P2017R1 Conditionally borrowed ranges #4516

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19 changes: 19 additions & 0 deletions source/ranges.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -214,6 +214,9 @@
// \ref{range.take}, take view
template<@\libconcept{view}@> class take_view;

template<class T>
inline constexpr bool enable_borrowed_range<take_view<T>> = enable_borrowed_range<T>;

namespace views { inline constexpr @\unspec@ take = @\unspec@; }

// \ref{range.take.while}, take while view
Expand All @@ -228,6 +231,9 @@
template<@\libconcept{view}@ V>
class drop_view;

template<class T>
inline constexpr bool enable_borrowed_range<drop_view<T>> = enable_borrowed_range<T>;

namespace views { inline constexpr @\unspec@ drop = @\unspec@; }

// \ref{range.drop.while}, drop while view
Expand All @@ -236,6 +242,10 @@
@\libconcept{indirect_unary_predicate}@<const Pred, iterator_t<V>>
class drop_while_view;

template<class T, class Pred>
inline constexpr bool enable_borrowed_range<drop_while_view<T, Pred>> =
enable_borrowed_range<T>;

namespace views { inline constexpr @\unspec@ drop_while = @\unspec@; }

// \ref{range.join}, join view
Expand Down Expand Up @@ -267,20 +277,29 @@
requires (!@\libconcept{common_range}@<V> && copyable<iterator_t<V>>)
class common_view;

template<class T>
inline constexpr bool enable_borrowed_range<common_view<T>> = enable_borrowed_range<T>;

namespace views { inline constexpr @\unspec@ common = @\unspec@; }

// \ref{range.reverse}, reverse view
template<@\libconcept{view}@ V>
requires @\libconcept{bidirectional_range}@<V>
class reverse_view;

template<class T>
inline constexpr bool enable_borrowed_range<reverse_view<T>> = enable_borrowed_range<T>;

namespace views { inline constexpr @\unspec@ reverse = @\unspec@; }

// \ref{range.elements}, elements view
template<@\libconcept{input_range}@ V, size_t N>
requires @\seebelow@
class elements_view;

template<class T, size_t N>
inline constexpr bool enable_borrowed_range<elements_view<T, N>> = enable_borrowed_range<T>;

template<class R>
using keys_view = elements_view<views::all_t<R>, 0>;
template<class R>
Expand Down