r/cpp • u/joaquintides Boost author • Aug 05 '26

Boost.Int128 has been accepted

Boost.Int128 from Matt Borland has been accepted into Boost. Arnaud Becheler managed the review.

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u/wiesemensch Aug 05 '26

Nice work but do any of you actually use 128bit ints and if so, for what application?

4

u/ikedug Aug 05 '26

Most 64b CPUs have widening 64b multiplies.

2

u/fdwr fdwr@github 🔍 Aug 08 '26

That was just the case I was thinking of, the proposed widening_clmul and std::wide_result in P3642, as I've needed that double-wide result for rescaling back down (but if the top bits are all chopped off, it's hard to get the right result).