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[2026-06 LWG Motion 7] P3505R4 Fix the default floating-point representation in std::format #9124

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[2026-06 LWG Motion 7] P3505R4 Fix the default floating-point representation in std::format #9124

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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 @@ -866,7 +866,7 @@
#define @\defnlibxname{cpp_lib_three_way_comparison}@ 201907L // freestanding, also in \libheader{compare}
#define @\defnlibxname{cpp_lib_to_address}@ 201711L // freestanding, also in \libheader{memory}
#define @\defnlibxname{cpp_lib_to_array}@ 201907L // freestanding, also in \libheader{array}
#define @\defnlibxname{cpp_lib_to_chars}@ 202306L // also in \libheader{charconv}
#define @\defnlibxname{cpp_lib_to_chars}@ 202606L // also in \libheader{charconv}
#define @\defnlibxname{cpp_lib_to_string}@ 202306L // also in \libheader{string}
#define @\defnlibxname{cpp_lib_to_underlying}@ 202102L // freestanding, also in \libheader{utility}
#define @\defnlibxname{cpp_lib_transformation_trait_aliases}@ 201304L // freestanding, also in \libheader{type_traits}
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13 changes: 9 additions & 4 deletions source/text.tex
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Expand Up @@ -174,13 +174,18 @@
\begin{itemdescr}
\pnum
\effects
Let \tcode{T} be \tcode{\placeholder{floating-point-type}}.
\tcode{value} is converted to a string
in the style of \tcode{printf}
in the \tcode{"C"} locale.
The conversion specifier is \tcode{f} or \tcode{e},
chosen according to the requirement for a shortest representation
(see above);
a tie is resolved in favor of \tcode{f}.
The conversion specifier is \tcode{f} if
the absolute value of \tcode{value} is in the range $[l, u)$, where
$l$ is the smallest value larger or equal to $10^{-4}$
that is representable by \tcode{T} and
$u$ is the largest value smaller or equal to
$\tcode{std::numeric_limits<T>::radix}^{\tcode{std::numeric_limits<T>::digits+1}}$
rounded down to the nearest power of 10 representable by \tcode{T},
otherwise \tcode{e}.

\pnum
\throws
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