pybind11/example/example16.cpp

/*
    example/example16.cpp -- automatic upcasting for polymorphic types

    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.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"

struct BaseClass { virtual ~BaseClass() {} };
struct DerivedClass1 : BaseClass { };
struct DerivedClass2 : BaseClass { };

void init_ex16(py::module &m) {
    py::class_<BaseClass>(m, "BaseClass").def(py::init<>());
    py::class_<DerivedClass1>(m, "DerivedClass1").def(py::init<>());
    py::class_<DerivedClass2>(m, "DerivedClass2").def(py::init<>());

    m.def("return_class_1", []() -> BaseClass* { return new DerivedClass1(); });
    m.def("return_class_2", []() -> BaseClass* { return new DerivedClass2(); });
    m.def("return_none", []() -> BaseClass* { return nullptr; });
}