I opened an issue for discussing this topic on Github. https://github.com/JuliaLang/julia/issues/5796
Ivar kl. 17:39:01 UTC+1 onsdag 12. februar 2014 skrev Stefan Karpinski følgende: > > Another option would be to raise an error if you take the absolute value > of typemin(Int). > > > On Wed, Feb 12, 2014 at 11:29 AM, Eric Davies <[email protected]<javascript:> > > wrote: > >> Ah, alright. I wasn't sure what the situation was on 32-bit platforms. >> >> >> On Wednesday, 12 February 2014 10:22:10 UTC-6, Stefan Karpinski wrote: >> >>> This is not a bug, it's by design: http://docs.julialang. >>> org/en/latest/manual/faq/#why-does-julia-use-native-machine- >>> integer-arithmetic. >>> >>> >>> On Wed, Feb 12, 2014 at 11:20 AM, Eric Davies <[email protected]> wrote: >>> >>>> Those on 64-bit systems can replicate this bug with abs(2^63) or >>>> abs(-9223372036854775808). >>>> >>>> The issue here is that the number 2^31 overflows the Int32 type to >>>> -(2^31). The fact that it returns itself is somewhat coincidental. >>>> >>>> This is probably a bug, but there are sometimes reasons for allowing >>>> overflow. >>>> >>>> On Wednesday, 12 February 2014 09:56:15 UTC-6, MikeEI wrote: >>>>> >>>>> abs(-2147483648) results in -2147483648 ??? >>>>> >>>>> @which(abs(-2147483648)) results in >>>>> abs(x::Signed) at intfuncs.jl:29 >>>>> >>>>> Shouldn't the type system promote to Int64 as there is no >>>>> corresponding Int32 value or indicate error? >>>>> >>>>> Just a newcomers/learners question. >>>>> >>>>> P.S.: Using version 0.2.0 (2013-11-16) on Linux Mint 32 bit system. >>>>> >>>> >>> >
