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P1161R3 Deprecate uses of the comma operator in subscripting expressions #3040

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Aug 2, 2019
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P1161R3 Deprecate uses of the comma operator in subscripting expressions #3040

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16 changes: 16 additions & 0 deletions source/expressions.tex
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Expand Up @@ -2862,6 +2862,14 @@
if that operand is an lvalue and an xvalue otherwise.
The expression \tcode{E1} is sequenced before the expression \tcode{E2}.

\pnum
\begin{note}
A comma expression\iref{expr.comma}
appearing as the \grammarterm{expr-or-braced-init-list}
of a subscripting expression is deprecated;
see \ref{depr.comma.subscript}.
\end{note}

\pnum
\begin{note}
Despite its asymmetric appearance, subscripting is a commutative
Expand Down Expand Up @@ -6793,6 +6801,14 @@
\tcode{5}.
\end{example}

\pnum
\begin{note}
A comma expression
appearing as the \grammarterm{expr-or-braced-init-list}
of a subscripting expression\iref{expr.sub} is deprecated;
see \ref{depr.comma.subscript}.
\end{note}

\rSec1[expr.const]{Constant expressions}%
\indextext{expression!constant}

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18 changes: 18 additions & 0 deletions source/future.tex
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Expand Up @@ -54,6 +54,24 @@
\end{codeblock}
\end{example}

\rSec1[depr.comma.subscript]{Comma operator in subscript expressions}

\pnum
A comma expression\iref{expr.comma}
appearing as the \grammarterm{expr-or-braced-init-list}
of a subscripting expression\iref{expr.sub} is deprecated.
\begin{note}
A parenthesized comma expression is not deprecated.
\end{note}
\begin{example}
\begin{codeblock}
void f(int *a, int b, int c) {
a[b,c]; // deprecated
a[(b,c)]; // OK
}
\end{codeblock}
\end{example}

\rSec1[depr.array.comp]{Array comparisons}

\pnum
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