Wrapping C++ struct with libcxxwrap-julia

sunayana · January 20, 2023, 8:03am

We were able to resolve this issue using StlWrappers from libcxxwrap-julia on the C++ side. Here is the code

Cervest/richdem/blob/master/src/jlrichdem/depressions/jldepressions.cpp#L57-L78


      
          struct WrapDepressionHierarchy
          {
              template <typename TypeWrapperT>
              void operator()(TypeWrapperT &&wrapped)
              {
                  using WrappedT = typename TypeWrapperT::type;
                  using StructT = typename WrappedT::value_type;
          
          
        wrapped.method("size", [](WrappedT &vec)
                                 { return vec.size(); });
          
          
        wrapped.module().set_override_module(jlcxx::stl::StlWrappers::instance().module());
                  wrapped.method("cxxgetindex", [](const WrappedT &v, int_t i) -> typename WrappedT::const_reference
                                 { return v[i - 1]; });
                  wrapped.method("cxxgetindex", [](WrappedT &v, int_t i) -> typename WrappedT::reference
                                 { return v[i - 1]; });
                  wrapped.method("cxxsetindex!", [](WrappedT &v, const StructT &val, int_t i)
                                 { v[i - 1] = val; });
                  wrapped.module().unset_override_module();
              }

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and the corresponding Julia side

github.com

Cervest/richdem/blob/master/wrappers/RichDEM.jl/src/RichDEM.jl#L34-L85


      
          struct DepressionSubset{T}
              pit_cell::UInt32
              out_cell::UInt32
              parent::UInt32
              odep::UInt32
              geolink::UInt32
              pit_elev::T
              out_elev::T
              lchild::UInt32
              rchild::UInt32
              ocean_parent::Bool
              dep_label::UInt32
              cell_count::UInt32
              dep_vol::Float64
              water_vol::Float64
              total_elevation::Float64
          end
          
          
mutable struct Depression{T}
              pit_cell::UInt32

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Wrapping C++ struct with libcxxwrap-julia

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