Unable to construct StdVector{CxxPtr{TaskArg}} from Vector{CxxRef{TaskArg}}

[omus]

julia> using Ray, CxxWrap

julia> Ray.init()

julia> task_args = Ray.serialize_args([1,2,3])
3-element Vector{Any}:
 ray_core_worker_julia_jll.TaskArgByValueAllocated(Ptr{Nothing} @0x0000600000042100)
 ray_core_worker_julia_jll.TaskArgByValueAllocated(Ptr{Nothing} @0x0000600000043be0)
 ray_core_worker_julia_jll.TaskArgByValueAllocated(Ptr{Nothing} @0x0000600000042560)

julia> CxxRef.(convert.(ray_jll.TaskArg, task_args))
3-element Vector{CxxRef{ray_core_worker_julia_jll.TaskArg}}:
 CxxRef{ray_core_worker_julia_jll.TaskArg}(Ptr{ray_core_worker_julia_jll.TaskArg} @0x0000600000051300)
 CxxRef{ray_core_worker_julia_jll.TaskArg}(Ptr{ray_core_worker_julia_jll.TaskArg} @0x000060000004de60)
 CxxRef{ray_core_worker_julia_jll.TaskArg}(Ptr{ray_core_worker_julia_jll.TaskArg} @0x000060000004d0e0)

julia> StdVector{CxxPtr{ray_jll.TaskArg}}(CxxRef.(convert.(ray_jll.TaskArg, task_args)))
ERROR: MethodError: no method matching StdVector{CxxPtr{ray_core_worker_julia_jll.TaskArg}}(::Vector{CxxRef{ray_core_worker_julia_jll.TaskArg}})

Closest candidates are:
  StdVector{CxxPtr{ray_core_worker_julia_jll.TaskArg}}()
   @ ray_core_worker_julia_jll ~/.julia/packages/CxxWrap/aXNBY/src/CxxWrap.jl:624

Stacktrace:
 [1] top-level scope
   @ REPL[15]:1

Originally posted by @omus in #72 (comment)

[omus]

Using Ray.jl af34bb3 and CxxWrap 0.14.2 on Julia 1.9.3 I see the following:

julia> using Ray, CxxWrap; using Ray: ray_jll

julia> Ray.init()

julia> task_args = Ray.serialize_args([1,2,3])
3-element Vector{Any}:
 Ray.ray_julia_jll.TaskArgByValueAllocated(Ptr{Nothing} @0x0000600000927e80)
 Ray.ray_julia_jll.TaskArgByValueAllocated(Ptr{Nothing} @0x0000600000927fe0)
 Ray.ray_julia_jll.TaskArgByValueAllocated(Ptr{Nothing} @0x00006000009248e0)

julia> task_arg_refs = CxxRef.(convert.(ray_jll.TaskArg, task_args))
3-element Vector{CxxRef{Ray.ray_julia_jll.TaskArg}}:
 CxxRef{Ray.ray_julia_jll.TaskArg}(Ptr{Ray.ray_julia_jll.TaskArg} @0x0000600000927e80)
 CxxRef{Ray.ray_julia_jll.TaskArg}(Ptr{Ray.ray_julia_jll.TaskArg} @0x0000600000927fe0)
 CxxRef{Ray.ray_julia_jll.TaskArg}(Ptr{Ray.ray_julia_jll.TaskArg} @0x00006000009248e0)

julia> StdVector{CxxPtr{ray_jll.TaskArg}}(task_arg_refs)
ERROR: MethodError: Cannot `convert` an object of type CxxRef{Ray.ray_julia_jll.TaskArg} to an object of type CxxPtr{Ray.ray_julia_jll.TaskArg}

Closest candidates are:
  convert(::Type{T}, ::T) where T
   @ Base Base.jl:64
  CxxPtr{T}(::CxxWrap.CxxWrapCore.CxxBaseRef) where T
   @ CxxWrap ~/.julia/packages/CxxWrap/5IZvn/src/CxxWrap.jl:199

julia> task_arg_ptrs = CxxPtr.(convert.(ray_jll.TaskArg, task_args))
3-element Vector{CxxPtr{Ray.ray_julia_jll.TaskArg}}:
 CxxPtr{Ray.ray_julia_jll.TaskArg}(Ptr{Ray.ray_julia_jll.TaskArg} @0x0000600000927e80)
 CxxPtr{Ray.ray_julia_jll.TaskArg}(Ptr{Ray.ray_julia_jll.TaskArg} @0x0000600000927fe0)
 CxxPtr{Ray.ray_julia_jll.TaskArg}(Ptr{Ray.ray_julia_jll.TaskArg} @0x00006000009248e0)

julia> StdVector{CxxPtr{ray_jll.TaskArg}}(task_arg_ptrs)
ERROR: StackOverflowError:
Stacktrace:
 [1] append(v::CxxWrap.StdLib.StdVectorAllocated{CxxPtr{Ray.ray_julia_jll.TaskArg}}, a::Vector{CxxPtr{Ray.ray_julia_jll.TaskArg}})
   @ CxxWrap.StdLib ~/.julia/packages/CxxWrap/5IZvn/src/StdLib.jl:33
 [2] _append_dispatch(v::CxxWrap.StdLib.StdVectorAllocated{CxxPtr{Ray.ray_julia_jll.TaskArg}}, a::Vector{CxxPtr{Ray.ray_julia_jll.TaskArg}}, #unused#::Type{CxxWrap.CxxWrapCore.IsNormalType})
   @ CxxWrap.StdLib ~/.julia/packages/CxxWrap/5IZvn/src/StdLib.jl:29

julia> StdVector{CxxPtr{ray_jll.TaskArg}}(CxxPtr.(task_args))
ERROR: MethodError: Cannot `convert` an object of type
  CxxPtr{Ray.ray_julia_jll.TaskArgByValue} to an object of type
  CxxPtr{Ray.ray_julia_jll.TaskArg}

Closest candidates are:
  convert(::Type{T}, ::T) where T
   @ Base Base.jl:64
  CxxPtr{T}(::CxxWrap.CxxWrapCore.CxxBaseRef) where T
   @ CxxWrap ~/.julia/packages/CxxWrap/5IZvn/src/CxxWrap.jl:199

julia> task_arg_ptr_vec = StdVector{CxxPtr{ray_jll.TaskArg}}()
0-element CxxWrap.StdLib.StdVectorAllocated{CxxPtr{Ray.ray_julia_jll.TaskArg}}

julia> for task_arg in task_args
           push!(task_arg_ptr_vec, CxxPtr(task_arg))
       end

julia> task_arg_ptr_vec
3-element CxxWrap.StdLib.StdVectorAllocated{CxxPtr{Ray.ray_julia_jll.TaskArg}}:
 CxxPtr{Ray.ray_julia_jll.TaskArg}(Ptr{Ray.ray_julia_jll.TaskArg} @0x0000600000927e80)
 CxxPtr{Ray.ray_julia_jll.TaskArg}(Ptr{Ray.ray_julia_jll.TaskArg} @0x0000600000927fe0)
 CxxPtr{Ray.ray_julia_jll.TaskArg}(Ptr{Ray.ray_julia_jll.TaskArg} @0x00006000009248e0)

Seems like we have a little more work to do with the StdVector constructors

[omus]

Fixing this would allow us to drop this function:

Ray.jl/src/runtime.jl

Lines 212 to 218 in af34bb3

	function transform_task_args(task_args)
	task_arg_ptrs = StdVector{CxxPtr{ray_jll.TaskArg}}()
	for task_arg in task_args
	push!(task_arg_ptrs, CxxPtr(task_arg))
	end
	return task_arg_ptrs
	end