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P3060R3 Add std::views::indices(n) #8006

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P3060R3 Add std::views::indices(n) #8006

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16 changes: 15 additions & 1 deletion source/ranges.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -215,7 +215,10 @@
template<class W, class Bound>
constexpr bool @\libspec{enable_borrowed_range}{iota_view}@<iota_view<W, Bound>> = true;

namespace views { inline constexpr @\unspecnc@ iota = @\unspecnc@; }
namespace views {
inline constexpr @\unspecnc@ iota = @\unspecnc@;
inline constexpr @\unspecnc@ indices = @\unspecnc@;
}

// \ref{range.repeat}, repeat view
template<@\libconcept{move_constructible}@ T, @\libconcept{semiregular}@ Bound = unreachable_sentinel_t>
Expand Down Expand Up @@ -2784,6 +2787,17 @@
\end{codeblock}
\end{example}

\pnum
\indexlibrarymember{indices}{views}%
The name \tcode{views::indices} denotes a
customization point object\iref{customization.point.object}.
Given subexpression \tcode{E},
let \tcode{T} be \tcode{remove_cvref_t<decltype((E))>}.
\tcode{views::indices(E)} is expression-equivalent to
\tcode{views::iota(T(0), E)}
if \tcode{\exposid{is-integer-like}<T>} is \tcode{true},
and ill-formed otherwise.
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Do we want this?

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and ill-formed otherwise.
and is ill-formed otherwise.

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I think it's fine either way.


\rSec3[range.iota.view]{Class template \tcode{iota_view}}

\indexlibraryglobal{iota_view}%
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1 change: 1 addition & 0 deletions source/support.tex
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Expand Up @@ -775,6 +775,7 @@
#define @\defnlibxname{cpp_lib_ranges_find_last}@ 202207L // also in \libheader{algorithm}
#define @\defnlibxname{cpp_lib_ranges_fold}@ 202207L // also in \libheader{algorithm}
#define @\defnlibxname{cpp_lib_ranges_generate_random}@ 202403L // also in \libheader{random}
#define @\defnlibxname{cpp_lib_ranges_indices}@ 202506L // also in \libheader{ranges}
#define @\defnlibxname{cpp_lib_ranges_iota}@ 202202L // also in \libheader{numeric}
#define @\defnlibxname{cpp_lib_ranges_join_with}@ 202202L // freestanding, also in \libheader{ranges}
#define @\defnlibxname{cpp_lib_ranges_repeat}@ 202207L // freestanding, also in \libheader{ranges}
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