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<format>: Incorrect decimal point placement when using alternate form without a type #3003

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mordante opened this issue Aug 7, 2022 · 1 comment · Fixed by #3815
Closed

<format>: Incorrect decimal point placement when using alternate form without a type #3003

mordante opened this issue Aug 7, 2022 · 1 comment · Fixed by #3815
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@barcharcraz
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bug Something isn't working fixed Something works now, yay! format C++20/23 format

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@mordante
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mordante commented Aug 7, 2022

@fsb4000 reported a bug in libc++'s format implementation. While investigating that bug I noticed that for a small part I'm in good company; MSVC STL has the same bug:

std::format("{:#.{}}\n", 1200.0 0);  // 1e+03. instead of 1.e+03
std::format("{:#.{}g}\n", 1200.0 0); // 1.e+03 as expected (types a, e, and f are good too.)

More examples at https://godbolt.org/z/fTsKaf6vz
@StephanTLavavej StephanTLavavej added bug Something isn't working format C++20/23 format labels Aug 7, 2022
@CaseyCarter
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CaseyCarter commented Aug 8, 2022 •
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Thanks for the report-back! (Physician, heal thyself! 😄)

@achabense achabense mentioned this issue Jun 20, 2023
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@StephanTLavavej StephanTLavavej added the fixed Something works now, yay! label Jun 22, 2023
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<format>: fix std::format("{:#.precision}", floating)
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@CaseyCarter @barcharcraz @mordante @StephanTLavavej