Fix PointerType Dynamic to Pointer conversion

include/cpp/marshal/PointerType.hpp

@@ -5,7 +5,7 @@
 template<class T>
 inline T* cpp::marshal::PointerType<T>::FromDynamic(const Dynamic& inRHS)
 {
-    return FromBoxed(inRHS.StaticCast<Boxed<T>>());
+    return FromBoxed(inRHS.StaticCast<Boxed<TPtr>>());
 }
 
 template<class T>

test/native/tests/marshalling/Build.xml

@@ -29,6 +29,10 @@
         <file name="${this_dir}/native/Managed.cpp">
             <depend name="${this_dir}/native/Managed.hpp"/>
         </file>
+
+        <file name="${this_dir}/native/Opaque.cpp">
+            <depend name="${this_dir}/native/Opaque.hpp"/>
+        </file>
     </files>
 
     <files id="haxe">

test/native/tests/marshalling/native/Opaque.cpp

@@ -0,0 +1,8 @@
+#include <Opaque.hpp>
+
+struct Opaque {};
+
+Opaque* opaque_create()
+{
+	return new Opaque();
+}

test/native/tests/marshalling/native/Opaque.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+struct Opaque;
+
+Opaque* opaque_create();

test/native/tests/marshalling/pointers/TestPointerFields.hx

@@ -18,6 +18,25 @@ private extern class Holder {
     var pPtr : Point;
 }
 
+@:semantics(value)
+@:include("Opaque.hpp")
+@:cpp.PointerType
+extern class Opaque {}
+
+@:include("Opaque.hpp")
+extern class OpaqueApi {
+    @:native("opaque_create")
+	static function create():Opaque;
+}
+
+private class OpaqueHolder {
+    public var opaque:Opaque;
+
+	public function new(opaque) {
+		this.opaque = opaque;
+	}
+}
+
 class TestPointerFields extends Test {
 
     function test_field_access() {
@@ -73,6 +92,12 @@ class TestPointerFields extends Test {
         Assert.equals(200f64, h.pPtr.y);
     }
 
+    function test_holding_opaque_pointer() {
+        final h = new OpaqueHolder(OpaqueApi.create());
+
+        Assert.notNull(h.opaque);
+    }
+
     function create_holder() : Holder {
         return untyped __cpp__('::holder(::hx::maths::point(), ::hx::maths::point())');
     }