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Avoid overflow further in rational::operator+=#50

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vedgy wants to merge 1 commit intoboostorg:developfrom
vedgy:operator-plus-avoid-overflow-further
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Avoid overflow further in rational::operator+=#50
vedgy wants to merge 1 commit intoboostorg:developfrom
vedgy:operator-plus-avoid-overflow-further

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@vedgy vedgy commented Jun 19, 2021

The added test case fails before and passes after the operator+= implementation change when sizeof(unsigned) == 4 and probably when sizeof(unsigned) == 8.

I don't know whether overflowing less justifies the slower implementation. Depends on how much overflow safety is prioritized over performance.

The added test case fails before and passes after the operator+=
implementation change when sizeof(unsigned) == 4 and probably when
sizeof(unsigned) == 8.
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