Wrapping C++ class

General Usage
5

Ok - I figured this out, but in doing so, I make this a poster child for automated wrapper generators: I missed some function arguments when I hand wrote the example. TL;DR the @ccall parts should have referenced this.p::Ptr{Cvoid}. I naively expected that an error would have been thrown for wrong arguments.

the longer version 
--- julia_test.jl       2023-08-07 16:35:21.170275259 -0500
+++ julia_test.jl.ori   2023-08-07 16:34:55.630275688 -0500
@@ -15,13 +15,13 @@
 function Base.getproperty(this::MainApp, s::Symbol)
     if s == :borrowA
         function()
-            ah = @ccall "libstuff_wrapper.so".MainApp_borrow_A(this.p::Ptr{Cvoid})::Ptr{Cvoid}
+            ah = @ccall "libstuff_wrapper.so".MainApp_borrow_A()::Ptr{Cvoid}
             @show ah
             A(ah)
         end
     elseif s == :borrowB
         function()
-            B(@ccall "libstuff_wrapper.so".MainApp_borrow_B(this.p::Ptr{Cvoid})::Ptr{Cvoid})
+            B(@ccall "libstuff_wrapper.so".MainApp_borrow_B()::Ptr{Cvoid})
         end
     else
         getfield(this, s)
@@ -42,7 +42,7 @@
     @show s
     if s == :get_id
         function()
-            @ccall "libstuff_wrapper.so".A_get_id(this.p::Ptr{Cvoid})::Cint
+            @ccall "libstuff_wrapper.so".A_get_id()::Cint
         end
     else
         getfield(this, s)
@@ -62,7 +62,7 @@
 function Base.getproperty(this::B, s::Symbol)
     if s == :get_s
         function()
-            @ccall "libstuff_wrapper.so".B_get_s(this.p::Ptr{Cvoid})::Cdouble
+            @ccall "libstuff_wrapper.so".B_get_s()::Cdouble
         end
     else
         getfield(this, s)