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72 lines
3.0 KiB
72 lines
3.0 KiB
3 years ago
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#ifndef Corrade_PluginManager_PythonBindings_h
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#define Corrade_PluginManager_PythonBindings_h
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/*
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This file is part of Magnum.
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
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2020, 2021, 2022 Vladimír Vondruš <mosra@centrum.cz>
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#include <memory> /* :( */
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#include <pybind11/pybind11.h>
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#include <Corrade/Containers/Pointer.h>
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#include <Corrade/Utility/Assert.h>
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namespace Corrade { namespace PluginManager {
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/* Stores additional stuff needed for proper refcounting of plugin instances.
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Due to obvious reasons we can't subclass plugins so this is the only
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possible way. */
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template<class T> struct PyPluginHolder: std::unique_ptr<T> {
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explicit PyPluginHolder(T* object) noexcept: std::unique_ptr<T>{object} {
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/* Plugin instance without an owner can only be without a manager and
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thus without any metadata */
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CORRADE_INTERNAL_ASSERT(!object->metadata());
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}
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explicit PyPluginHolder(T* object, pybind11::object manager) noexcept: std::unique_ptr<T>{object}, manager{std::move(manager)} {}
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PyPluginHolder(PyPluginHolder<T>&&) noexcept = default;
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PyPluginHolder(const PyPluginHolder<T>&) = delete;
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PyPluginHolder<T>& operator=(PyPluginHolder<T>&&) noexcept = default;
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PyPluginHolder<T>& operator=(const PyPluginHolder<T>&) = default;
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~PyPluginHolder() {
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/* On destruction, first `manager` and then the plugin would be
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destroyed, which would mean it asserts due to the manager being
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destructed while plugins are still around. To flip the order, we
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need to reset the pointer first */
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std::unique_ptr<T>::reset();
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}
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pybind11::object manager;
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};
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template<class T> PyPluginHolder<T> pyPluginHolder(Containers::Pointer<T>&& plugin, pybind11::object owner) {
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return PyPluginHolder<T>{plugin.release(), std::move(owner)};
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}
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}}
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PYBIND11_DECLARE_HOLDER_TYPE(T, Corrade::PluginManager::PyPluginHolder<T>)
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#endif
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