StdVector of Tuple

[grasph]

Hello Bart,

I get a compilation error if I try to call apply_stl for a tuple. Code to reproduce the issue and the resulting error follow. Any idea, how this could be fixed?

Code

#include "jlcxx/jlcxx.hpp"
#include "jlcxx/stl.hpp"

JLCXX_MODULE define_julia_module(jlcxx::Module& mod)
{
  jlcxx::stl::apply_stl<std::tuple<double, double>>(mod);
}

Error

In file included from ~/.julia/artifacts/d379d731f869ddcffe30d14534f721b657420132/include/jlcxx/jlcxx.hpp:14,
                 from ~/dev/julia/cxxwrap_vector_of_tuple/vecoftuples.cxx:1:
~/.julia/artifacts/d379d731f869ddcffe30d14534f721b657420132/include/jlcxx/array.hpp: In instantiation of ‘ValueT& jlcxx::ArrayRef::operator[](std::size_t) [with ValueT = std::tuple; int Dim = 1; std::size_t = long unsigned int]’:
~/.julia/artifacts/d379d731f869ddcffe30d14534f721b657420132/include/jlcxx/stl.hpp:161:24:   required from ‘void jlcxx::stl::WrapVector::operator()(TypeWrapperT&&) [with TypeWrapperT = jlcxx::TypeWrapper, std::allocator > > >]’
~/.julia/artifacts/d379d731f869ddcffe30d14534f721b657420132/include/jlcxx/module.hpp:1225:15:   required from ‘int jlcxx::TypeWrapper::apply_internal(FunctorT&&) [with AppliedT = std::vector, std::allocator > >; FunctorT = jlcxx::stl::WrapVector; T = jlcxx::Parametric >]’
~/.julia/artifacts/d379d731f869ddcffe30d14534f721b657420132/include/jlcxx/module.hpp:1174:63:   required from ‘jlcxx::TypeWrapper& jlcxx::TypeWrapper::apply(FunctorT&&) [with AppliedTypesT = {std::vector, std::allocator > >}; FunctorT = jlcxx::stl::WrapVector; T = jlcxx::Parametric >]’
~/.julia/artifacts/d379d731f869ddcffe30d14534f721b657420132/include/jlcxx/stl.hpp:379:74:   required from ‘void jlcxx::stl::apply_stl(jlcxx::Module&) [with T = std::tuple]’
~/dev/julia/cxxwrap_vector_of_tuple/vecoftuples.cxx:6:52:   required from here
~/.julia/artifacts/d379d731f869ddcffe30d14534f721b657420132/include/jlcxx/array.hpp:257:52: error: invalid initialization of reference of type ‘const jlcxx::WrappedCppPtr&’ from expression of type ‘jlcxx::ArrayRef, 1>::julia_t’ {aka ‘_jl_value_t*’}
  257 |       return *extract_pointer_nonull(data()[i]);
      |                                      ~~~~~~^
In file included from ~/.julia/artifacts/d379d731f869ddcffe30d14534f721b657420132/include/jlcxx/array.hpp:4:
~/.julia/artifacts/d379d731f869ddcffe30d14534f721b657420132/include/jlcxx/type_conversion.hpp:186:58: note: in passing argument 1 of ‘CppT* jlcxx::extract_pointer_nonull(const WrappedCppPtr&) [with CppT = std::tuple]’
  186 | inline CppT* extract_pointer_nonull(const WrappedCppPtr& p)
      |                                     ~~~~~~~~~~~~~~~~~~~~~^

Thanks in advance for your help,

Philippe.

[barche]

Hi Philippe,

A fix for this is now in the main branch of libcxxwrap-julia/CxxWrap (you need to compile libcxxwrap to test). Note that in the (hopefully soon to be released) main version of CxxWrap apply_stl is no longer present, it is now sufficient to just include stl.hpp.