pybind11/example/example-keep-alive.cpp

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/*
example/example-keep-alive.cpp -- keep_alive modifier (pybind11's version
of Boost.Python's with_custodian_and_ward / with_custodian_and_ward_postcall)
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"
class Child {
public:
Child() { std::cout << "Allocating child." << std::endl; }
~Child() { std::cout << "Releasing child." << std::endl; }
};
class Parent {
public:
Parent() { std::cout << "Allocating parent." << std::endl; }
~Parent() { std::cout << "Releasing parent." << std::endl; }
void addChild(Child *) { }
Child *returnChild() { return new Child(); }
};
void init_ex_keep_alive(py::module &m) {
py::class_<Parent>(m, "Parent")
.def(py::init<>())
.def("addChild", &Parent::addChild)
.def("addChildKeepAlive", &Parent::addChild, py::keep_alive<1, 2>())
.def("returnChild", &Parent::returnChild)
.def("returnChildKeepAlive", &Parent::returnChild, py::keep_alive<1, 0>());
py::class_<Child>(m, "Child")
.def(py::init<>());
}