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| /* Copyright 2018-2022 Axel Huebl and Franz Poeschel | ||
| * | ||
| * This file is part of openPMD-api. | ||
| * | ||
| * openPMD-api is free software: you can redistribute it and/or modify | ||
| * it under the terms of of either the GNU General Public License or | ||
| * the GNU Lesser General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * openPMD-api is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License and the GNU Lesser General Public License | ||
| * for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * and the GNU Lesser General Public License along with openPMD-api. | ||
| * If not, see <http://www.gnu.org/licenses/>. | ||
| * | ||
| * The function `bind_container` is based on std_bind.h in pybind11 | ||
| * Copyright (c) 2016 Sergey Lyskov and Wenzel Jakob | ||
| * | ||
| * BSD-style license, see pybind11 LICENSE file. | ||
| */ | ||
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| #pragma once | ||
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| #include "openPMD/backend/Attributable.hpp" | ||
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| #include <pybind11/pybind11.h> | ||
| #include <pybind11/stl.h> | ||
| #include <pybind11/stl_bind.h> | ||
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| #include <memory> | ||
| #include <string> | ||
| #include <utility> | ||
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| namespace py = pybind11; | ||
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| namespace openPMD::detail | ||
| { | ||
| /* based on std_bind.h in pybind11 | ||
| * | ||
| * Copyright (c) 2016 Sergey Lyskov and Wenzel Jakob | ||
| * | ||
| * BSD-style license, see pybind11 LICENSE file. | ||
| */ | ||
| template <typename Map, typename Class_> | ||
| Class_ bind_container(Class_ &cl, std::string const &name) | ||
| { | ||
| using KeyType = typename Map::key_type; | ||
| using MappedType = typename Map::mapped_type; | ||
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| // Register stream insertion operator (if possible) | ||
| py::detail::map_if_insertion_operator<Map, Class_>(cl, name); | ||
|
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| cl.def( | ||
| "__bool__", | ||
| [](const Map &m) -> bool { return !m.empty(); }, | ||
| "Check whether the container is nonempty"); | ||
|
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| cl.def( | ||
| "__iter__", | ||
| [](Map &m) { return py::make_key_iterator(m.begin(), m.end()); }, | ||
| // keep container alive while iterator exists | ||
| py::keep_alive<0, 1>()); | ||
|
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| cl.def( | ||
| "items", | ||
| [](Map &m) { return py::make_iterator(m.begin(), m.end()); }, | ||
| // keep container alive while iterator exists | ||
| py::keep_alive<0, 1>()); | ||
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| // keep same policy as Container class: missing keys are created | ||
| cl.def( | ||
| "__getitem__", | ||
| [](Map &m, KeyType const &k) -> MappedType & { return m[k]; }, | ||
| // ref + keepalive | ||
| py::return_value_policy::reference_internal); | ||
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| // Assignment provided only if the type is copyable | ||
| py::detail::map_assignment<Map, Class_>(cl); | ||
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| cl.def("__delitem__", [](Map &m, KeyType const &k) { | ||
| auto it = m.find(k); | ||
| if (it == m.end()) | ||
| throw py::key_error(); | ||
| m.erase(it); | ||
| }); | ||
|
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| cl.def("__len__", &Map::size); | ||
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| cl.def("_ipython_key_completions_", [](Map &m) { | ||
| auto l = py::list(); | ||
| for (const auto &myPair : m) | ||
| l.append(myPair.first); | ||
| return l; | ||
| }); | ||
|
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| return cl; | ||
| } | ||
|
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| template < | ||
| typename Map, | ||
| typename holder_type = std::unique_ptr<Map>, | ||
| typename... Args> | ||
| py::class_<Map, holder_type, Attributable> create_and_bind_container( | ||
| py::handle scope, std::string const &name, Args &&...args) | ||
| { | ||
| using KeyType = typename Map::key_type; | ||
| using MappedType = typename Map::mapped_type; | ||
| using Class_ = py::class_<Map, holder_type, Attributable>; | ||
|
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| // If either type is a non-module-local bound type then make the map | ||
| // binding non-local as well; otherwise (e.g. both types are either | ||
| // module-local or converting) the map will be module-local. | ||
| auto tinfo = py::detail::get_type_info(typeid(MappedType)); | ||
| bool local = !tinfo || tinfo->module_local; | ||
| if (local) | ||
| { | ||
| tinfo = py::detail::get_type_info(typeid(KeyType)); | ||
| local = !tinfo || tinfo->module_local; | ||
| } | ||
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| Class_ cl( | ||
| scope, | ||
| name.c_str(), | ||
| py::module_local(local), | ||
| std::forward<Args>(args)...); | ||
|
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| // maybe move this to bind_container | ||
| cl.def(py::init<Map const &>()); | ||
| return bind_container<Map>(cl, name); | ||
| } | ||
| } // namespace openPMD::detail |
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