No need to flatten if everything is immutable. This file has some examples of wrapping structs of structs https://github.com/jakebolewski/LibGit2.jl/blob/cac78b5c03531b5afbcb0ae042538dd351527752/src/types.jl#L19.
On Sunday, November 16, 2014 12:33:39 PM UTC-5, Tim Holy wrote: > > AFAIK no need to flatten. > > Since Isaiah didn't advertise it himself, I'll mention his Clang.jl > package, > which I've found to be a big help in such situations. It's just possible > you > may not need any C glue code. > > --Tim > > On Sunday, November 16, 2014 12:15:50 PM Erik Schnetter wrote: > > Thanks for the pointers on immutable types. > > > > Is it possible to access structs inside structs this way? That a > > struct inside a struct, not a pointer inside a struct. Is an immutable > > type again a bits type? Or do I need to flatten the structs to make > > this work? > > > > -erik > > > > On Sun, Nov 16, 2014 at 11:16 AM, Isaiah Norton <[email protected] > <javascript:>> > wrote: > > >> The library defines some C structs that are part of the API. My > > >> current approach uses wrapper C functions to access struct elements. > > >> Is there a better way? > > > > > > It depends how complicated are the structs. Structs can often be > reflected > > > as Julia types, as long as isbits(TypeName) == true, and accessed with > > > unsafe_load (see for example PyCall's definitions of PyObject_*). Some > > > tricky spots include fixed-size arrays and unions (strictly speaking > you > > > can make an aggregate element having the maximal size in the union, > and > > > then do bitshifts manually. but there is no automatic support). > > > > > > There is also the StrPack.jl package, which calculates the appropriate > > > memory layout for a given struct and provides > > > serialization/deserialization.> > > >> I thus I need to build this wrapper file as well. I created a > > >> SimpleBuild rule for this. However, I need to know the path where > > >> BinDeps installed (or found) the header files so that I can compile > > >> this file. How do I access this information? > > > > > > This is going to be package-manager and build-tool specific, and I > don't > > > know if there is any abstraction/helper for includes in BinDeps yet. > > > > > > On Sun, Nov 16, 2014 at 10:09 AM, Erik Schnetter <[email protected] > <javascript:>> > > > > > > wrote: > > >> I want to wrap a library (hwloc) for Julia. This is working fine. > > >> > > >> The library defines some C structs that are part of the API. My > > >> current approach uses wrapper C functions to access struct elements. > > >> Is there a better way? > > >> > > >> I thus I need to build this wrapper file as well. I created a > > >> SimpleBuild rule for this. However, I need to know the path where > > >> BinDeps installed (or found) the header files so that I can compile > > >> this file. How do I access this information? > > >> > > >> -erik > > >> > > >> -- > > >> Erik Schnetter <[email protected] <javascript:>> > > >> http://www.perimeterinstitute.ca/personal/eschnetter/ > >
