I've created a rudimentary set of bindings to the LCIO file format
<http://lcio.desy.de/v02-07/doc/>.
It's an event data model and file format for detector and physics studies
of future linear collider concepts.
The code is over on github https://github.com/jstrube/LCIO.jl
The purpose of this post isn't to announce this code, however, since at the
moment it's rather fugly and jumping through extern "C" {} stubs.
I would like to improve the usability a little and thought that Cxx.jl
could help with that, but I'm struggling with the first steps.
I have Cxx installed, but I'm confused about how to use it.
I'm using the following to set it up.
using Cxx
addHeaderDir(joinpath(ENV["LCIO"], "include"), kind=C_User)
Libdl.dlopen(joinpath(ENV["LCIO"], "lib", "liblcio.so.2.7.1"),
Libdl.RTLD_GLOBAL)
cxxinclude("lcio.h")
cxxinclude("IO/LCReader.h")
cxxinclude("IOIMPL/LCFactory.h")
cxx"IO::LCReader* reader =
IOIMPL::LCFactory::getInstance()->createLCReader();"
This works fine.
However, I would prefer this as the last line instead:
reader = @cxx IOIMPL::LCFactory::getInstance()->createLCReader()
Unfortunately, this gives me "IOIMPL not defined."
Similarly,
julia> @cxx reader
(class IO::LCReader *) @0x0000000002fb0b70
julia> @cxx reader->open(pointer("gev250ee_higgs_ZZ_001_tracking.slcio"))
ERROR: UndefVarError: reader not defined
in eval(::Module, ::Any) at ./boot.jl:225
in macro expansion at ./REPL.jl:92 [inlined]
in (::Base.REPL.##1#2{Base.REPL.REPLBackend})() at ./event.jl:46
So "reader" is found and has the right type, but when trying to access
member functions, it's no longer found???
I'd file a bug report, but I'm not at all sure I'm actually using this
correctly.
If you can think of a reason why this behavior is expected, and what I
could do to remedy, please let me know.
