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P0609R3 Attributes for Structured Bindings #6891

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Apr 15, 2024
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P0609R3 Attributes for Structured Bindings #6891

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32 changes: 26 additions & 6 deletions source/declarations.tex
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Expand Up @@ -67,11 +67,27 @@
\keyword{using} identifier \opt{attribute-specifier-seq} \terminal{=} defining-type-id \terminal{;}
\end{bnf}

\begin{bnf}
\nontermdef{attributed-identifier}\br
identifier \opt{attribute-specifier-seq}
\end{bnf}

\begin{bnf}
\nontermdef{attributed-identifier-list}\br
attributed-identifier\br
attributed-identifier-list \terminal{,} attributed-identifier
\end{bnf}

\begin{bnf}
\nontermdef{structured-binding-declaration}\br
\opt{attribute-specifier-seq} decl-specifier-seq \opt{ref-qualifier} \terminal{[} attributed-identifier-list \terminal{]}
\end{bnf}

\begin{bnf}
\nontermdef{simple-declaration}\br
decl-specifier-seq \opt{init-declarator-list} \terminal{;}\br
attribute-specifier-seq decl-specifier-seq init-declarator-list \terminal{;}\br
\opt{attribute-specifier-seq} decl-specifier-seq \opt{ref-qualifier} \terminal{[} identifier-list \terminal{]} initializer \terminal{;}
structured-binding-declaration initializer \terminal{;}
\end{bnf}

\begin{bnf}
Expand Down Expand Up @@ -186,7 +202,7 @@
\end{example}

\pnum
A \grammarterm{simple-declaration} with an \grammarterm{identifier-list} is called
A \grammarterm{simple-declaration} with a \grammarterm{structured-binding-declaration} is called
a \defn{structured binding declaration}\iref{dcl.struct.bind}.
Each \grammarterm{decl-specifier} in the \grammarterm{decl-specifier-seq}
shall be
Expand Down Expand Up @@ -6968,8 +6984,11 @@
A structured binding declaration introduces the \grammarterm{identifier}{s}
$\tcode{v}_0$, $\tcode{v}_1$, $\tcode{v}_2, \dotsc$
of the
\grammarterm{identifier-list} as names
\grammarterm{attributed-identifier-list} as names
of \defn{structured binding}{s}.
The optional \grammarterm{attribute-specifier-seq} of
an \grammarterm{attributed-identifier}
appertains to the structured binding so introduced.
Let \cv{} denote the \grammarterm{cv-qualifier}{s} in
the \grammarterm{decl-specifier-seq} and
\placeholder{S} consist of the \grammarterm{storage-class-specifier}{s} of
Expand Down Expand Up @@ -7008,7 +7027,7 @@

\pnum
If \tcode{E} is an array type with element type \tcode{T}, the number
of elements in the \grammarterm{identifier-list} shall be equal to the
of elements in the \grammarterm{attributed-identifier-list} shall be equal to the
number of elements of \tcode{E}. Each $\tcode{v}_i$ is the name of an
lvalue that refers to the element $i$ of the array and whose type
is \tcode{T}; the referenced type is \tcode{T}.
Expand All @@ -7031,7 +7050,7 @@
shall be a well-formed integral constant expression
and
the number of elements in
the \grammarterm{identifier-list} shall be equal to the value of that
the \grammarterm{attributed-identifier-list} shall be equal to the value of that
expression.
Let \tcode{i} be an index prvalue of type \tcode{std::size_t}
corresponding to $\tcode{v}_i$.
Expand Down Expand Up @@ -7073,7 +7092,7 @@
well-formed when named as \tcode{\exposidnc{e}.\placeholder{name}}
in the context of the structured binding,
\tcode{E} shall not have an anonymous union member, and
the number of elements in the \grammarterm{identifier-list} shall be
the number of elements in the \grammarterm{attributed-identifier-list} shall be
equal to the number of non-static data members of \tcode{E}.
Designating the non-static data members of \tcode{E} as
$\tcode{m}_0$, $\tcode{m}_1$, $\tcode{m}_2, \dotsc$
Expand Down Expand Up @@ -9246,6 +9265,7 @@
The attribute may be applied to the declaration of a class,
\grammarterm{typedef-name},
variable (including a structured binding declaration),
structured binding,
non-static data member,
function,
enumeration, or
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2 changes: 1 addition & 1 deletion source/preprocessor.tex
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Expand Up @@ -1868,7 +1868,7 @@
\defnxname{cpp_sized_deallocation} & \tcode{201309L} \\ \rowsep
\defnxname{cpp_static_assert} & \tcode{202306L} \\ \rowsep
\defnxname{cpp_static_call_operator} & \tcode{202207L} \\ \rowsep
\defnxname{cpp_structured_bindings} & \tcode{201606L} \\ \rowsep
\defnxname{cpp_structured_bindings} & \tcode{202403L} \\ \rowsep
\defnxname{cpp_template_template_args} & \tcode{201611L} \\ \rowsep
\defnxname{cpp_threadsafe_static_init} & \tcode{200806L} \\ \rowsep
\defnxname{cpp_unicode_characters} & \tcode{200704L} \\ \rowsep
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2 changes: 1 addition & 1 deletion source/statements.tex
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Expand Up @@ -509,7 +509,7 @@
\begin{bnf}
\nontermdef{for-range-declaration}\br
\opt{attribute-specifier-seq} decl-specifier-seq declarator\br
\opt{attribute-specifier-seq} decl-specifier-seq \opt{ref-qualifier} \terminal{[} identifier-list \terminal{]}
structured-binding-declaration
\end{bnf}

\begin{bnf}
Expand Down