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51 lines
1.8 KiB
51 lines
1.8 KiB
/*
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example/example15.cpp -- pickle support
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Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
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All rights reserved. Use of this source code is governed by a
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BSD-style license that can be found in the LICENSE file.
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*/
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#include "example.h"
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class Pickleable {
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public:
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Pickleable(const std::string &value) : m_value(value) { }
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const std::string &value() const { return m_value; }
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void setExtra1(int extra1) { m_extra1 = extra1; }
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void setExtra2(int extra2) { m_extra2 = extra2; }
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int extra1() const { return m_extra1; }
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int extra2() const { return m_extra2; }
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private:
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std::string m_value;
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int m_extra1 = 0;
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int m_extra2 = 0;
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};
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void init_ex15(py::module &m) {
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py::class_<Pickleable>(m, "Pickleable")
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.def(py::init<std::string>())
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.def("value", &Pickleable::value)
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.def("extra1", &Pickleable::extra1)
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.def("extra2", &Pickleable::extra2)
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.def("setExtra1", &Pickleable::setExtra1)
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.def("setExtra2", &Pickleable::setExtra2)
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// For details on the methods below, refer to
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// http://docs.python.org/3/library/pickle.html#pickling-class-instances
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.def("__getstate__", [](const Pickleable &p) {
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/* Return a tuple that fully encodes the state of the object */
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return py::make_tuple(p.value(), p.extra1(), p.extra2());
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})
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.def("__setstate__", [](Pickleable &p, py::tuple t) {
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if (t.size() != 3)
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throw std::runtime_error("Invalid state!");
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/* Invoke the constructor (need to use in-place version) */
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new (&p) Pickleable(t[0].cast<std::string>());
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/* Assign any additional state */
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p.setExtra1(t[1].cast<int>());
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p.setExtra2(t[2].cast<int>());
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});
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}
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