<random>: Fixes subtract_with_carry_engine io
#2088
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| for (int _Jx = 1; _Jx <= _Kx; ++_Jx) { // unpack into _Kx words | ||
| unsigned int _Word = static_cast<unsigned int>(_Buf._At(_Ix) >> ((_Kx - _Jx) * 32)); | ||
| for (int _Jx = 0; _Jx < _Kx; ++_Jx) { // unpack into _Kx words | ||
| const unsigned int _Word = static_cast<unsigned int>(_Buf._At(_Ix) >> (_Jx * 32)); |
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Note for other reviewers (no change requested): as the runtime behavior here was completely messed up, I am okay with changing the serialized output.
StephanTLavavej
approved these changes
Sep 28, 2021
CaseyCarter
approved these changes
Oct 8, 2021
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I'm mirroring this to an MSVC-internal PR. Please notify me if any further changes are pushed. |
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Thank you for the bug fix! |
AZero13
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Nov 4, 2021
Co-authored-by: Stephan T. Lavavej <[email protected]>
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tr1::subtract_with_carry, breaking the state into 32-bit words, but the streaming operators should be consistent now.subtract_with_carry_enginestreaming operators hiddenfriends.tr1classes continue to go through a free function taking an_Swc_base&.subtract_with_carry_enginestreaming operators [tab:rand.req.eng], specifically the handling of the stream's flags and leaving the state unchanged if reading fails.