Add recompute method in SignalBase python class.

    * src/dynamic-graph-py.cc,
    * src/dynamic_graph/signal_base.py,
    * src/signal-base-py.cc.

src/dynamic-graph-py.cc

@@ -21,6 +21,7 @@ namespace dynamicgraph {
       extern PyObject* getTime(PyObject* self, PyObject* args);
       extern PyObject* getValue(PyObject* self, PyObject* args);
       extern PyObject* setValue(PyObject* self, PyObject* args);
+      extern PyObject* recompute(PyObject* self, PyObject* args);
     }
     namespace entity {
       extern PyObject* create(PyObject* self, PyObject* args);
@@ -128,6 +129,8 @@ static PyMethodDef dynamicGraphMethods[] = {
    METH_VARARGS, "Read the value of a signal"},
   {"signal_base_set_value", dynamicgraph::python::signalBase::setValue,
    METH_VARARGS, "Set the value of a signal"},
+  {"signal_base_recompute", dynamicgraph::python::signalBase::recompute,
+   METH_VARARGS, "Recompute the signal at given time"},
   // Entity
   {"create_entity", dynamicgraph::python::entity::create, METH_VARARGS,
    "create an Entity C++ object"},

src/dynamic_graph/signal_base.py

@@ -199,3 +199,9 @@ class SignalBase (object) :
         """
         string = objectToString(val)
         return wrap.signal_base_set_value(self.obj, string)
+
+    def recompute(self, time):
+        """
+        Force signal to recompute the value at given time.
+        """
+        return wrap.signal_base_recompute(self.obj, time)

src/signal-base-py.cc

@@ -123,6 +123,22 @@ namespace dynamicgraph {
 
 	return Py_BuildValue("");
       }
+
+      PyObject* recompute(PyObject* self, PyObject* args)
+      {
+	void * pointer = NULL;
+	PyObject* object = NULL;
+	unsigned int time;
+	if (!PyArg_ParseTuple(args,"OI", &object, &time))
+	  return NULL;
+	if (!PyCObject_Check(object))
+	  return NULL;
+
+	pointer = PyCObject_AsVoidPtr(object);
+	SignalBase<int>* signal = (SignalBase<int>*)pointer;
+	signal->recompute(time);
+	return Py_BuildValue("");
+      }
     }
   }
 }