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[charconv.from.chars] Clarify how from_chars treats the sign of zero in floating-point underflow #8595

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[charconv.from.chars] Clarify how from_chars treats the sign of zero in floating-point underflow #8595

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5 changes: 5 additions & 0 deletions source/text.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -271,6 +271,11 @@
\tcode{value} is set to the parsed value,
after rounding according to \tcode{round_to_nearest}\iref{round.style}, and
the member \tcode{ec} is value-initialized.
\begin{note}
If the parsed value is too small to be represented,
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@jensmaurer jensmaurer Dec 10, 2025

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"too small" could mean -1e3000, but we don't mean that.

Please pass this through LWG; this needs exposition to the implementers.

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@jwakely jwakely Dec 10, 2025

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We already have LWG3081

\tcode{ec} is value-initialized and
\tcode{value} is set to a zero with the same sign as the parsed value before rounding.
\end{note}

\indexlibraryglobal{from_chars}%
\begin{itemdecl}
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