On Mon, Nov 9, 2015 at 8:04 AM, andrew cooke <and...@acooke.org> wrote: > > https://github.com/andrewcooke/StatefulIterators.jl
FYI, one way to make this more efficient is to parametrize the iterator. You could easily do this for Array's. In the more general case, you needs type inference to get the type right for a non-type-stable iterator (iterator with a type unstable index...) but it's generally a bad idea to write code that calls type inference directly. > > > On Monday, 9 November 2015 06:24:14 UTC-3, andrew cooke wrote: >> >> thanks! >> >> On Sunday, 8 November 2015 22:40:53 UTC-3, Yichao Yu wrote: >>> >>> On Sun, Nov 8, 2015 at 8:11 PM, andrew cooke <and...@acooke.org> wrote: >>> > I'd like to be able to use take() and all the other iterator tools with >>> > a >>> > stream of data backed by an array (or string). >>> > >>> > By that I mean I'd like to be able to do something like: >>> > >>> >> stream = XXX([1,2,3,4,5]) >>> >> collect(take(stream, 3)) >>> > [1,2,3] >>> >> collect(take(stream, 2)) >>> > [4,5] >>> > >>> > Is this possible? I can find heavyweight looking streams for IO, and I >>> > can >>> > find lightweight iterables without state. But I can't seem to find the >>> > particular mix described above. >>> >>> Jeff's conclusion @ JuliaCon is that it seems impossible to implement >>> this (stateful iterator) currently in a generic and performant way so >>> I doubt you will find it in a generic iterator library (that works not >>> only on arrays). A version that works only on Arrays should be simple >>> enough to implement and doesn't sound useful enough to be in an >>> exported API so I guess you probably should just implement your own. >>> >>> Ref >>> https://groups.google.com/forum/?fromgroups=#!searchin/julia-users/iterator/julia-users/t4ZieI2_iwI/3NTw1k406qkJ >>> >>> > >>> > (I think I can see how to write it myself; I'm asking if it already >>> > exists - >>> > seems like it should, but I can't find the right words to search for). >>> > >>> > Thanks, >>> > Andrew >>> >
