fix gcc build error

Author: Arkueid

LAppModelWrapper.cpp

@@ -250,7 +250,7 @@ static PyObject* PyLAppModel_SetRandomExpression(PyLAppModelObject* self, PyObje
 
     self->fadeout = fadeout;
 
-    std::string& expId = self->model->SetRandomExpression();
+    const std::string expId = self->model->SetRandomExpression();
 
     PyObject* pyExpIdStr = Py_BuildValue("s", expId.c_str());
 
@@ -261,8 +261,8 @@ static PyObject* PyLAppModel_SetRandomExpression(PyLAppModelObject* self, PyObje
     }
     else
     {
-        self->lastExpression = std::string(expId);
-        Info("set default expression: %s", expId);
+        self->lastExpression = expId;
+        Info("set default expression: %s", expId.c_str());
     }
 
     return pyExpIdStr;

package/test_getters.py

@@ -38,13 +38,18 @@ def main():
 
     expIds = model.GetExpressionIds()
     motionGroups = model.GetMotionGroups()
+    paramIds = model.GetParamIds()
 
     print(expIds)
 
     print("===")
 
     print(motionGroups)
 
+    print("===")
+
+    print(paramIds)
+
     while True:
         for event in pygame.event.get():
             if event.type == pygame.QUIT:
@@ -55,6 +60,7 @@ def main():
             break
 
         model.Update()
+        paramIds = model.GetParamIds()
         expIds = model.GetExpressionIds()
         motionGroups = model.GetMotionGroups()