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P3355R1 Fix submdspan for C++26 #7491

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Dec 17, 2024
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P3355R1 Fix submdspan for C++26 #7491

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65 changes: 29 additions & 36 deletions source/containers.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -24319,6 +24319,17 @@
let \tcode{offset} be a value of type \tcode{size_t} equal to
\tcode{(*this)(\exposid{first_}<index_type, P>(slices...)...)}.

\pnum
Given a layout mapping type \tcode{M}, a type \tcode{S} is a
\defnadjx{unit-stride}{slice for \tcode{M}}{slice} if
\begin{itemize}
\item \tcode{S} is a specialization of \tcode{strided_slice}
where \tcode{S::stride_type} models \exposconcept{integral-constant-like}
and \tcode{S::stride_type::value} equals \tcode{1},
\item \tcode{S} models \tcode{\exposconcept{index-pair-like}<M::index_type>}, or
\item \tcode{is_convertible_v<S, full_extent_t>} is \tcode{true}.
\end{itemize}

\rSec5[mdspan.sub.map.left]{\tcode{layout_left} specialization of \tcode{submdspan_mapping}}

\indexlibrarymemberexpos{layout_left::mapping}{submdspan-mapping-impl}%
Expand Down Expand Up @@ -24350,8 +24361,7 @@
\tcode{is_convertible_v<$S_k$, full_ext\-ent_t>} is \tcode{true}; and
\item
for $k$ equal to \tcode{SubExtents::rank() - 1},
$S_k$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_k$, full_extent_t>} is \tcode{true};
$S_k$ is a unit-stride slice for \tcode{decltype(*this)};
\end{itemize}
\begin{note}
If the above conditions are true,
Expand All @@ -24366,21 +24376,17 @@
\end{codeblock}
if for a value $u$ for which $u+1$ is
the smallest value $p$ larger than zero
for which $S_p$ models
\tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_p$, full_extent_t>} is \tcode{true},
for which $S_p$ is a unit-stride slice for \tcode{decltype(*this)},
the following conditions are met:
\begin{itemize}
\item
$S_0$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_0$, full_extent_t>} is \tcode{true}; and
$S_0$ is a unit-stride slice for \tcode{decltype(*this)}; and
\item
for each $k$ in the range \range{$u$ + 1}{$u$ + SubExtents::rank() - 1},
\tcode{is_convertible_v<$S_k$, full_extent_t>} is \tcode{true}; and
\item
for $k$ equal to \tcode{$u$ + SubExtents::rank() - 1},
$S_k$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_k$, full_extent_t>} is \tcode{true};
$S_k$ is a unit-stride slice for \tcode{decltype(*this)};
\end{itemize}
and where \tcode{S_static} is:
\begin{itemize}
Expand Down Expand Up @@ -24431,8 +24437,7 @@
\tcode{is_convertible_v<$S_k$, full_extent_t>} is \tcode{true}; and
\item
for $k$ equal to \exposid{_rank} - \tcode{SubExtents::rank()},
$S_k$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_k$, full_extent_t>} is \tcode{true};
$S_k$ is a unit-stride slice for \tcode{decltype(*this)};
\end{itemize}
\begin{note}
If the above conditions are true,
Expand All @@ -24447,23 +24452,19 @@
\end{codeblock}
if for a value $u$ for which $\exposid{rank_} - u - 2$ is
the largest value $p$ smaller than \tcode{\exposid{rank_} - 1}
for which $S_p$ models
\tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_p$, full_extent_t>} is \tcode{true},
for which $S_p$ is a unit-stride slice for \tcode{decltype(*this)},
the following conditions are met:
\begin{itemize}
\item
for $k$ equal to \tcode{\exposid{rank_} - 1},
$S_k$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_k$, full_extent_t> }is \tcode{true}; and
$S_k$ is a unit-stride slice for \tcode{decltype(*this)}; and
\item
for each $k$ in the range
\range{\exposid{rank_} - SubExtents::rank() - $u$ + 1}{\exposid{rank_} - $u$ - 1},
\tcode{is_con\-vertible_v<$S_k$, full_extent_t>} is \tcode{true}; and
\item
for $k$ equal to \tcode{\exposid{rank_} - SubExtents::rank() - $u$},
$S_k$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_k$, full_extent_t>} is \tcode{true};
for $k$ equal to \tcode{\exposid{rank_} - SubExtents::rank() - $u$},\newline
$S_k$ is a unit-stride slice for \tcode{decltype(*this)};
\end{itemize}
and where \tcode{S_static} is:
\begin{itemize}
Expand Down Expand Up @@ -24539,8 +24540,7 @@
\item
\tcode{SubExtents::rank() == 1} is \tcode{true} and
\item
$S_0$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_0$ , full_extent_t>} is \tcode{true};
$S_0$ is a unit-stride slice for \tcode{decltype(*this)};
\end{itemize}
\item
otherwise,
Expand All @@ -24550,20 +24550,17 @@
\end{codeblock}
if for a value $u$
for which \tcode{$u$ + 1} is the smallest value $p$ larger than zero
for which $S_p$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_p$, full_extent_t>} is \tcode{true},
for which $S_p$ is a unit-stride slice for \tcode{decltype(*this)},
the following conditions are met:
\begin{itemize}
\item
$S_0$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_0$, full_extent_t>} is \tcode{true}; and
$S_0$ is a unit-stride slice for \tcode{decltype(*this)}; and
\item
for each $k$ in the range \range{$u$ + 1}{$u$ + SubExtents::rank() - 1},
\tcode{is_convertible_v<$S_k$, full_extent_t>} is \tcode{true}; and
\item
for $k$ equal to \tcode{$u$ + SubExtents::rank() - 1},
$S_k$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<Sk, full_extent_t>} is \tcode{true};
$S_k$ is a unit-stride slice for \tcode{decltype(*this)};
\end{itemize}
where \tcode{S_static} is:
\begin{itemize}
Expand Down Expand Up @@ -24615,8 +24612,7 @@
\tcode{SubExtents::rank() == 1} is \tcode{true} and
\item
for $k$ equal to \tcode{\exposid{rank_} - 1},
$S_k$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_k$ , full_extent_t>} is \tcode{true};
$S_k$ is a unit-stride slice for \tcode{decltype(*this)};
\end{itemize}
\item
otherwise,
Expand All @@ -24627,22 +24623,19 @@
if for a value $u$
for which \tcode{\exposid{rank_} - $u$ - 2}
is the largest value p smaller than \tcode{\exposid{rank_} - 1}
for which $S_p$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_p$, full_extent_t>} is \tcode{true},
for which $S_p$ is a unit-stride slice for \tcode{decltype(*this)},
the following conditions are met:
\begin{itemize}
\item
for $k$ equal to \tcode{\exposid{rank_} - 1},
$S_k$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_k$, full_extent_t>} is \tcode{true}; and
$S_k$ is a unit-stride slice for \tcode{decltype(*this)}; and
\item
for each $k$ in the range
\range{\exposid{rank_} - SubExtents::rank() - $u$ + 1}{\exposid{rank_} - $u$ - 1)},
\tcode{is_convertible_v<$S_k$, full_extent_t>} is \tcode{true}; and
\item
for $k$ equal to \tcode{\exposid{rank_} - SubExtents::rank() - $u$},
$S_k$ models \tcode{\exposconcept{index-pair-like}<index_type>} or
\tcode{is_convertible_v<$S_k$, full_extent_t>} is \tcode{true};
for $k$ equal to \tcode{\exposid{rank_} - SubExtents::rank() - $u$},\newline
$S_k$ is a unit-stride slice for \tcode{decltype(*this)};
\end{itemize}
and where \tcode{S_static} is:
\begin{itemize}
Expand Down
2 changes: 1 addition & 1 deletion source/support.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -797,7 +797,7 @@
#define @\defnlibxname{cpp_lib_string_resize_and_overwrite}@ 202110L // also in \libheader{string}
#define @\defnlibxname{cpp_lib_string_udls}@ 201304L // also in \libheader{string}
#define @\defnlibxname{cpp_lib_string_view}@ 202403L // also in \libheader{string}, \libheader{string_view}
#define @\defnlibxname{cpp_lib_submdspan}@ 202403L // freestanding, also in \libheader{mdspan}
#define @\defnlibxname{cpp_lib_submdspan}@ 202411L // freestanding, also in \libheader{mdspan}
#define @\defnlibxname{cpp_lib_syncbuf}@ 201803L // also in \libheader{syncstream}
#define @\defnlibxname{cpp_lib_text_encoding}@ 202306L // also in \libheader{text_encoding}
#define @\defnlibxname{cpp_lib_three_way_comparison}@ 201907L // freestanding, also in \libheader{compare}
Expand Down
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