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P1009R2 Array size deduction in new-expressions #2731

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Mar 12, 2019
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P1009R2 Array size deduction in new-expressions #2731

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P1009R2 Array size deduction in new-expressions
jensmaurer Mar 4, 2019
c9074b5
[expr.new] Move treatment of arrays of unknown bound
jensmaurer Mar 6, 2019
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20 changes: 14 additions & 6 deletions source/expressions.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -4433,7 +4433,7 @@

\begin{bnf}
\nontermdef{noptr-new-declarator}\br
\terminal{[} expression \terminal{]} \opt{attribute-specifier-seq}\br
\terminal{[} \opt{expression} \terminal{]} \opt{attribute-specifier-seq}\br
noptr-new-declarator \terminal{[} constant-expression \terminal{]} \opt{attribute-specifier-seq}
\end{bnf}

Expand Down Expand Up @@ -4547,9 +4547,6 @@
\grammarterm{noptr-new-declarator} shall be a converted constant
expression\iref{expr.const} of type \tcode{std::size_t} and
shall evaluate to a strictly positive value.
\indextext{\idxcode{new}}%
The \grammarterm{expression} in a \grammarterm{noptr-new-declarator} is
implicitly converted to \tcode{std::size_t}.
\begin{example}
Given the definition \tcode{int n = 42},
\tcode{new float[n][5]} is well-formed (because \tcode{n} is the
Expand All @@ -4559,9 +4556,20 @@
\end{example}

\pnum
If the \grammarterm{type-id} or \grammarterm{new-type-id}
denotes an array type of unknown bound\iref{dcl.array},
the \grammarterm{new-initializer} shall not be omitted;
the allocated object is an array with \tcode{n} elements,
where \tcode{n} is determined from the number of initial elements
supplied in
the \grammarterm{new-initializer}~(\ref{dcl.init.aggr}, \ref{dcl.init.string}).

\pnum
\indextext{\idxcode{new}}%
If the \grammarterm{expression} in a \grammarterm{noptr-new-declarator}
is present, it is implicitly converted to \tcode{std::size_t}.
\indextext{function!allocation}%
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Do you think this index should precede the new text?

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It's existing stuff, and I'm not too happy about the indexing here in general. I'd like to leave it as-is for now.

The \grammarterm{expression} in a \grammarterm{noptr-new-declarator} is
erroneous if:
The \grammarterm{expression} is erroneous if:

\begin{itemize}
\item
Expand Down