Nicolas Lehuen's Weblog

Here is the new PythonReference implementation, based on what I’ve learned from Scott Meyers’ Effective C++.

 class PythonReference { public:     explicit PythonReference() : ref(Py_None) {         Py_INCREF(ref);     }     explicit PythonReference(PyObject *object, int borrow=1) : ref(object) {         if(ref==NULL) {             throw TSTException("Cannot reference NULL");         }         if(borrow) {             Py_INCREF(ref);         }     }     PythonReference(const PythonReference& that) : ref(that.ref) {         Py_INCREF(ref);     }     PythonReference& operator= (const PythonReference& that) {         PyObject* old = ref;         if((this->ref = that.ref) != old) {             Py_INCREF(ref);             Py_DECREF(old);         }         return *this;     }     ~PythonReference() {         Py_DECREF(ref);     }     int operator==(const PythonReference& that) {         return (ref==that.ref);     }     int operator!=(const PythonReference& that) {         return (ref!=that.ref);     }     PyObject* get() {         return ref;     }     PyObject* lend() {         Py_INCREF(ref);         return ref;     } private:     PyObject* ref; };