I'm guessing that is done to prevent overflow. So you need to use your own implementation. Here are the promote rules defining this behavior: https://github.com/JuliaLang/julia/blob/master/base/reduce.jl#L32 So in theory you could also implement your own Int type, that has a different promote behavior. Probably not worth it, though ;)
Am Montag, 17. Oktober 2016 15:19:51 UTC+2 schrieb Ángel de Vicente: > > Hi, > > probably a very basic question, but I'm just starting to play around > with Julia types. > > I was hoping to improve the performance of a little program I wrote, so > I decided to try Int32 integers instead of the default Int64, but if I > try to use sum, it seems that it is expecting Int64 and the result is > Int64, defeating the purpose of working with Int32 and actually making > the code much slower than the naive version. > > ,---- > | julia> typeof(sum([i for i in Int32(1):Int32(100)])) > > | > | Int64 > `---- > > Do I have to write down my own Int32::sum function? I assume I'm missing > something quite obvious? > > Thanks, > -- > Ángel de Vicente > http://www.iac.es/galeria/angelv/ >
