add the middle class: `Container` to help resolve circular issues

1 files changed, 3 insertions, 0 deletions

diff --git a/model.cpp b/model.cpp
index 938deca..cb3d5c6 100644
--- a/model.cpp
+++ b/model.cpp
@@ -132,3 +132,6 @@ string EvalObj::ext_repr() {
 
 RetAddr::RetAddr(Pair *_addr, Pair *_state) : 
     FrameObj(CLS_RET_ADDR), addr(_addr), state(_state) {}
+
+Container::Container(int otype) : EvalObj(otype | CLS_CONTAINER) {
+}