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example/example8.cpp

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+/*
+    example/example8.cpp -- Example 8: binding classes with
+    custom reference counting, implicit conversions between types
+
+    Copyright (c) 2015 Wenzel Jakob <wenzel@inf.ethz.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "example.h"
+#include "object.h"
+
+/// Object subclass
+class MyObject : public Object {
+public:
+    MyObject(int value) : value(value) {
+        std::cout << toString() << " constructor" << std::endl;
+    }
+
+    std::string toString() const {
+        return "MyObject[" + std::to_string(value) + "]";
+    }
+
+protected:
+    virtual ~MyObject() {
+        std::cout << toString() << " destructor" << std::endl;
+    }
+
+private:
+    int value;
+};
+
+/// Make pybind aware of the ref-counted wrapper type
+namespace pybind { namespace detail {
+template <typename T> class type_caster<ref<T>>
+    : public type_caster_holder<T, ref<T>> { };
+}}
+
+Object *make_object_1() { return new MyObject(1); }
+ref<Object> make_object_2() { return new MyObject(2); }
+MyObject *make_myobject_4() { return new MyObject(4); }
+ref<MyObject> make_myobject_5() { return new MyObject(5); }
+
+void print_object_1(const Object *obj) { std::cout << obj->toString() << std::endl; }
+void print_object_2(ref<Object> obj) { std::cout << obj->toString() << std::endl; }
+void print_object_3(const ref<Object> &obj) { std::cout << obj->toString() << std::endl; }
+void print_object_4(const ref<Object> *obj) { std::cout << (*obj)->toString() << std::endl; }
+
+void print_myobject_1(const MyObject *obj) { std::cout << obj->toString() << std::endl; }
+void print_myobject_2(ref<MyObject> obj) { std::cout << obj->toString() << std::endl; }
+void print_myobject_3(const ref<MyObject> &obj) { std::cout << obj->toString() << std::endl; }
+void print_myobject_4(const ref<MyObject> *obj) { std::cout << (*obj)->toString() << std::endl; }
+
+void init_ex8(py::module &m) {
+    py::class_<Object, ref<Object>> obj(m, "Object");
+    obj.def("getRefCount", &Object::getRefCount);
+
+    py::class_<MyObject, ref<MyObject>>(m, "MyObject", obj)
+        .def(py::init<int>());
+
+    m.def("make_object_1", &make_object_1);
+    m.def("make_object_2", &make_object_2);
+    m.def("make_myobject_4", &make_myobject_4);
+    m.def("make_myobject_5", &make_myobject_5);
+    m.def("print_object_1", &print_object_1);
+    m.def("print_object_2", &print_object_2);
+    m.def("print_object_3", &print_object_3);
+    m.def("print_object_4", &print_object_4);
+    m.def("print_myobject_1", &print_myobject_1);
+    m.def("print_myobject_2", &print_myobject_2);
+    m.def("print_myobject_3", &print_myobject_3);
+    m.def("print_myobject_4", &print_myobject_4);
+
+    py::implicitly_convertible<py::int_, MyObject>();
+}