do not call and create any python object when no python callback is

connected

diff --git a/lib/python/connections.cpp b/lib/python/connections.cpp
index fd3e2a4..3c31baf 100644 (file)
--- a/lib/python/connections.cpp
+++ b/lib/python/connections.cpp
@@ -2,13 +2,11 @@
 
 PSignal::PSignal()
 {
-       m_list = PyList_New(0);
-       Py_INCREF(m_list);
 }
 
 PSignal::~PSignal()
 {
-       Py_DECREF(m_list);
+       Py_XDECREF(m_list);
 }
 
 void PSignal::callPython(ePyObject tuple)
@@ -24,6 +22,11 @@ void PSignal::callPython(ePyObject tuple)
 
 PyObject *PSignal::get()
 {
+       if (!m_list)
+       {
+               m_list = PyList_New(0);
+               Py_INCREF(m_list);
+       }
        Py_INCREF(m_list);
        return m_list;
 }

diff --git a/lib/python/connections.h b/lib/python/connections.h
index d24bb42..8ff3a62 100644 (file)
--- a/lib/python/connections.h
+++ b/lib/python/connections.h
@@ -12,6 +12,7 @@
 
 class PSignal
 {
+protected:
        ePyObject m_list;
 public:
        PSignal();
@@ -36,9 +37,12 @@ class PSignal0: public PSignal, public Signal0<R>
 public:
        R operator()()
        {
-               PyObject *pArgs = PyTuple_New(0);
-               callPython(pArgs);
-               Org_Py_DECREF(pArgs);
+               if (m_list)
+               {
+                       PyObject *pArgs = PyTuple_New(0);
+                       callPython(pArgs);
+                       Org_Py_DECREF(pArgs);
+               }
                return Signal0<R>::operator()();
        }
 };
@@ -49,10 +53,13 @@ class PSignal1: public PSignal, public Signal1<R,V0>
 public:
        R operator()(V0 a0)
        {
-               PyObject *pArgs = PyTuple_New(1);
-               PyTuple_SET_ITEM(pArgs, 0, PyFrom(a0));
-               callPython(pArgs);
-               Org_Py_DECREF(pArgs);
+               if (m_list)
+               {
+                       PyObject *pArgs = PyTuple_New(1);
+                       PyTuple_SET_ITEM(pArgs, 0, PyFrom(a0));
+                       callPython(pArgs);
+                       Org_Py_DECREF(pArgs);
+               }
                return Signal1<R,V0>::operator()(a0);
        }
 };
@@ -63,11 +70,14 @@ class PSignal2: public PSignal, public Signal2<R,V0,V1>
 public:
        R operator()(V0 a0, V1 a1)
        {
-               PyObject *pArgs = PyTuple_New(2);
-               PyTuple_SET_ITEM(pArgs, 0, PyFrom(a0));
-               PyTuple_SET_ITEM(pArgs, 1, PyFrom(a1));
-               callPython(pArgs);
-               Org_Py_DECREF(pArgs);
+               if (m_list)
+               {
+                       PyObject *pArgs = PyTuple_New(2);
+                       PyTuple_SET_ITEM(pArgs, 0, PyFrom(a0));
+                       PyTuple_SET_ITEM(pArgs, 1, PyFrom(a1));
+                       callPython(pArgs);
+                       Org_Py_DECREF(pArgs);
+               }
                return Signal2<R,V0,V1>::operator()(a0, a1);
        }
 };