[cpp] Ensure int hash is treated as int. Fixes #5102

src/generators/gencpp.ml

@@ -5197,7 +5197,7 @@ let generate_class_files baseCtx super_deps constructor_deps class_def inScripta
       output_cpp ("\t__mClass->mMarkFunc = " ^ class_name ^ "_sMarkStatics;\n");
       (*output_cpp ("\t__mClass->mStatics = hx::Class_obj::dupFunctions(" ^ sStaticFields ^ ");\n");*)
       output_cpp ("\t__mClass->mMembers = hx::Class_obj::dupFunctions(" ^ sMemberFields ^ ");\n");
-      output_cpp ("\t__mClass->mCanCast = hx::TIsInterface< " ^ (cpp_class_hash class_def)  ^ " >;\n");
+      output_cpp ("\t__mClass->mCanCast = hx::TIsInterface< (int)" ^ (cpp_class_hash class_def)  ^ " >;\n");
       output_cpp ("#ifdef HXCPP_VISIT_ALLOCS\n\t__mClass->mVisitFunc = " ^ class_name ^ "_sVisitStatics;\n#endif\n");
       output_cpp ("\thx::RegisterClass(__mClass->mName, __mClass);\n");
       if (scriptable) then