Thanks for all the pointers! Things are now working fine without wrapper functions but with 120 lines of immutable type declarations. Clang.jl sounds interesting, but would probably make hwloc.jl too difficult to use if it is a prerequisite. Let's see how often the structs of hwloc change with future versions.
hwloc is a portable library that determines the number of cores (and many other properties) of the local machine: see <https://github.com/eschnett/hwloc.jl>. -erik On Sun, Nov 16, 2014 at 12:41 PM, Jake Bolewski <[email protected]> wrote: > 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]> >> 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]> >> > > >> > > 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]> >> > >> http://www.perimeterinstitute.ca/personal/eschnetter/ >> > -- Erik Schnetter <[email protected]> http://www.perimeterinstitute.ca/personal/eschnetter/
