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P3391R2constexpr std::format#8530

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@eisenwaveeisenwave commentedNov 15, 2025•
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Fixes#8480
Fixes NB FR-028-271, US 167-270 (C++26 CD).

Alsofixescplusplus/papers#2046
Alsofixeshttps://github.com/cplusplus/nbballot/issues/845
Alsofixeshttps://github.com/cplusplus/nbballot/issues/846
Alsofixeshttps://github.com/cplusplus/nbballot/issues/844

Alsofixescplusplus/papers#2102 (P3438R0 Make integral overloads ofstd::to_stringconstexpr)

@eisenwaveeisenwave added this to thepost-2025-11 milestoneNov 15, 2025
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I find it weird that this paper changesto_string andformat without bumping__cpp_lib_to_string or__cpp_lib_format, but I guess that's for LWG to judge.

Fixes NB FR-028-271, US 167-270 (C++26 CD).
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jwakely commentedNov 16, 2025•
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I find it weird that this paper changesto_string andformat without bumping__cpp_lib_to_string or__cpp_lib_format, but I guess that's for LWG to judge.

Yeah I guess we (LWG) should fix that.

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It seems correct to me to add__cpp_lib_constexpr_format instead of bumping__cpp_lib_format. For theto_string part, Iguess a more consistent fix would be bumping__cpp_lib_constexpr_string.

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[2025-11 LWG Motion 21] P3391R2 constexpr std::format P3438 R0 Make integral overloads of std::to_string constexpr P3391 R1 constexpr std::format

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