Hi Keno,
Got it, thanks. I can work with that.
Cheers,
Jan
On Wednesday, May 25, 2016 at 6:37:51 PM UTC-7, Keno Fischer wrote:
>
> Hi Jan,
>
> first of, I recommend using the string macros icxx and cxx over the @cxx
> syntax. That should make it a lot clearer what's happening. To answer your
> question,
>
> @cxx reader, is the equivalent of icxx"reader;",
> however @cxx reader->stuff is the equivalent of icxx"$reader->stuff", so
> reader is searched for in julia scope rather than C++ scope. Hope that
> makes sense.
>
> Keno
>
> On Wed, May 25, 2016 at 7:54 PM, Jan Strube <[email protected]
> <javascript:>> wrote:
>
>> 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.
>>
>>
>
