<charconv>: Fix from_chars for floating-point types
#3670
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- handle non-zero tail digits in the integral part - change the calculation of the exponent part
StephanTLavavej
approved these changes
Apr 27, 2023
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Thank you! 😻 😻 😻 These changes are exceptionally clean and I pushed only the tiniest of nitpicks. |
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I'm speculatively mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed. |
strega-nil-ms
approved these changes
Apr 27, 2023
| // Adjust _Exponent and _Exponent_adjustment when they have different signedness to avoid overflow. | ||
| if (_Exponent > 0 && _Exponent_adjustment < 0) { | ||
| if (_Is_hexadecimal) { | ||
| const ptrdiff_t _Further_adjustment = (_STD max)(-((_Exponent - 1) / 4 + 1), _Exponent_adjustment); |
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Not worth resetting testing, but it'd be nice in these "_Further_adjustment is negative" cases, to instead negate the other term and use (_STD min); this would imo, make it much clearer what's happening, and you won't be adding and subtracting a negative number.
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Thanks again so much for investigating and fixing these bugs in my favorite header! 😻 🎉 🚀 |
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This PR
Fixes #1792. Fixes #3161.