bugfix: segfault in Grid.at() due to internal types not exported to module

After #184/#189 made GridPoint and GridPointState internal-only types,
code using PyObject_GetAttrString(mcrf_module, "GridPoint") would get
NULL and crash when dereferencing.

Fixed by using the type directly via &mcrfpydef::PyUIGridPointType
instead of looking it up in the module.

Affected functions:
- UIGrid::py_at()
- UIGridPointState::get_point()
- UIEntity::at()
- UIGridPointState_to_PyObject()

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/UIEntity.cpp

@@ -122,9 +122,9 @@ PyObject* UIEntity::at(PyUIEntityObject* self, PyObject* args, PyObject* kwds) {
         return NULL;
     }
 
-    auto type = (PyTypeObject*)PyObject_GetAttrString(McRFPy_API::mcrf_module, "GridPointState");
+    // Use type directly since GridPointState is internal-only (not exported to module)
+    auto type = &mcrfpydef::PyUIGridPointStateType;
     auto obj = (PyUIGridPointStateObject*)type->tp_alloc(type, 0);
-    Py_DECREF(type);
     obj->data = &(self->data->gridstate[y * self->data->grid->grid_x + x]);
     obj->grid = self->data->grid;
     obj->entity = self->data;
@@ -320,14 +320,10 @@ sf::Vector2i PyObject_to_sfVector2i(PyObject* obj) {
 
 PyObject* UIGridPointState_to_PyObject(const UIGridPointState& state) {
     // Create a new GridPointState Python object (detached - no grid/entity context)
-    auto type = (PyTypeObject*)PyObject_GetAttrString(McRFPy_API::mcrf_module, "GridPointState");
+    // Use type directly since GridPointState is internal-only (not exported to module)
-    if (!type) {
+    auto type = &mcrfpydef::PyUIGridPointStateType;
-        return NULL;
-    }
-
     auto obj = (PyUIGridPointStateObject*)type->tp_alloc(type, 0);
     if (!obj) {
-        Py_DECREF(type);
         return NULL;
     }
 
@@ -342,7 +338,6 @@ PyObject* UIGridPointState_to_PyObject(const UIGridPointState& state) {
     obj->x = -1;
     obj->y = -1;
 
-    Py_DECREF(type);
     return (PyObject*)obj;
 }
 

src/UIGrid.cpp

@@ -1182,8 +1182,8 @@ PyObject* UIGrid::py_at(PyUIGridObject* self, PyObject* args, PyObject* kwds)
         return NULL;
     }
 
-    //PyUIGridPointObject* obj = (PyUIGridPointObject*)((&PyUIGridPointType)->tp_alloc(&PyUIGridPointType, 0));
+    // Use the type directly since GridPoint is internal-only (not exported to module)
-    auto type = (PyTypeObject*)PyObject_GetAttrString(McRFPy_API::mcrf_module, "GridPoint");
+    auto type = &mcrfpydef::PyUIGridPointType;
     auto obj = (PyUIGridPointObject*)type->tp_alloc(type, 0);
     //auto target = std::static_pointer_cast<UIEntity>(target);
     // #123 - Use at() method to route through chunks for large grids

src/UIGridPoint.cpp

@@ -201,12 +201,9 @@ PyObject* UIGridPointState::get_point(PyUIGridPointStateObject* self, void* clos
         return NULL;
     }
 
-    // Return the GridPoint at this position
+    // Return the GridPoint at this position (use type directly since it's internal-only)
-    auto type = (PyTypeObject*)PyObject_GetAttrString(McRFPy_API::mcrf_module, "GridPoint");
+    auto type = &mcrfpydef::PyUIGridPointType;
-    if (!type) return NULL;
-
     auto obj = (PyUIGridPointObject*)type->tp_alloc(type, 0);
-    Py_DECREF(type);
     if (!obj) return NULL;
 
     // Get the GridPoint from the grid