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Merge commit 'f34e604d3b4bee5339ec4e9c9f36619b17f52e32' as 'examples/knxPython/pybind11'
This commit is contained in:
Thomas Kunze
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examples/knxPython/pybind11/tests/test_buffers.cpp
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214
examples/knxPython/pybind11/tests/test_buffers.cpp
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/*
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tests/test_buffers.cpp -- supporting Pythons' buffer protocol
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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 "pybind11_tests.h"
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#include "constructor_stats.h"
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#include <pybind11/stl.h>
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TEST_SUBMODULE(buffers, m) {
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// test_from_python / test_to_python:
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class Matrix {
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public:
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Matrix(py::ssize_t rows, py::ssize_t cols) : m_rows(rows), m_cols(cols) {
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print_created(this, std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
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m_data = new float[(size_t) (rows*cols)];
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memset(m_data, 0, sizeof(float) * (size_t) (rows * cols));
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}
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Matrix(const Matrix &s) : m_rows(s.m_rows), m_cols(s.m_cols) {
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print_copy_created(this, std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
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m_data = new float[(size_t) (m_rows * m_cols)];
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memcpy(m_data, s.m_data, sizeof(float) * (size_t) (m_rows * m_cols));
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}
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Matrix(Matrix &&s) : m_rows(s.m_rows), m_cols(s.m_cols), m_data(s.m_data) {
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print_move_created(this);
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s.m_rows = 0;
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s.m_cols = 0;
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s.m_data = nullptr;
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}
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~Matrix() {
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print_destroyed(this, std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
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delete[] m_data;
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}
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Matrix &operator=(const Matrix &s) {
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print_copy_assigned(this, std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
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delete[] m_data;
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m_rows = s.m_rows;
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m_cols = s.m_cols;
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m_data = new float[(size_t) (m_rows * m_cols)];
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memcpy(m_data, s.m_data, sizeof(float) * (size_t) (m_rows * m_cols));
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return *this;
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}
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Matrix &operator=(Matrix &&s) {
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print_move_assigned(this, std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
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if (&s != this) {
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delete[] m_data;
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m_rows = s.m_rows; m_cols = s.m_cols; m_data = s.m_data;
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s.m_rows = 0; s.m_cols = 0; s.m_data = nullptr;
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}
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return *this;
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}
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float operator()(py::ssize_t i, py::ssize_t j) const {
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return m_data[(size_t) (i*m_cols + j)];
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}
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float &operator()(py::ssize_t i, py::ssize_t j) {
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return m_data[(size_t) (i*m_cols + j)];
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}
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float *data() { return m_data; }
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py::ssize_t rows() const { return m_rows; }
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py::ssize_t cols() const { return m_cols; }
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private:
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py::ssize_t m_rows;
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py::ssize_t m_cols;
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float *m_data;
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};
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py::class_<Matrix>(m, "Matrix", py::buffer_protocol())
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.def(py::init<py::ssize_t, py::ssize_t>())
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/// Construct from a buffer
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.def(py::init([](py::buffer const b) {
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py::buffer_info info = b.request();
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if (info.format != py::format_descriptor<float>::format() || info.ndim != 2)
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throw std::runtime_error("Incompatible buffer format!");
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auto v = new Matrix(info.shape[0], info.shape[1]);
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memcpy(v->data(), info.ptr, sizeof(float) * (size_t) (v->rows() * v->cols()));
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return v;
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}))
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.def("rows", &Matrix::rows)
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.def("cols", &Matrix::cols)
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/// Bare bones interface
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.def("__getitem__", [](const Matrix &m, std::pair<py::ssize_t, py::ssize_t> i) {
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if (i.first >= m.rows() || i.second >= m.cols())
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throw py::index_error();
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return m(i.first, i.second);
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})
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.def("__setitem__", [](Matrix &m, std::pair<py::ssize_t, py::ssize_t> i, float v) {
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if (i.first >= m.rows() || i.second >= m.cols())
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throw py::index_error();
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m(i.first, i.second) = v;
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})
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/// Provide buffer access
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.def_buffer([](Matrix &m) -> py::buffer_info {
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return py::buffer_info(
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m.data(), /* Pointer to buffer */
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{ m.rows(), m.cols() }, /* Buffer dimensions */
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{ sizeof(float) * size_t(m.cols()), /* Strides (in bytes) for each index */
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sizeof(float) }
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);
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})
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;
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// test_inherited_protocol
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class SquareMatrix : public Matrix {
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public:
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SquareMatrix(py::ssize_t n) : Matrix(n, n) { }
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};
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// Derived classes inherit the buffer protocol and the buffer access function
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py::class_<SquareMatrix, Matrix>(m, "SquareMatrix")
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.def(py::init<py::ssize_t>());
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// test_pointer_to_member_fn
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// Tests that passing a pointer to member to the base class works in
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// the derived class.
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struct Buffer {
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int32_t value = 0;
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py::buffer_info get_buffer_info() {
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return py::buffer_info(&value, sizeof(value),
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py::format_descriptor<int32_t>::format(), 1);
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}
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};
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py::class_<Buffer>(m, "Buffer", py::buffer_protocol())
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.def(py::init<>())
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.def_readwrite("value", &Buffer::value)
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.def_buffer(&Buffer::get_buffer_info);
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class ConstBuffer {
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std::unique_ptr<int32_t> value;
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public:
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int32_t get_value() const { return *value; }
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void set_value(int32_t v) { *value = v; }
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py::buffer_info get_buffer_info() const {
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return py::buffer_info(value.get(), sizeof(*value),
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py::format_descriptor<int32_t>::format(), 1);
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}
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ConstBuffer() : value(new int32_t{0}) { };
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};
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py::class_<ConstBuffer>(m, "ConstBuffer", py::buffer_protocol())
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.def(py::init<>())
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.def_property("value", &ConstBuffer::get_value, &ConstBuffer::set_value)
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.def_buffer(&ConstBuffer::get_buffer_info);
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struct DerivedBuffer : public Buffer { };
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py::class_<DerivedBuffer>(m, "DerivedBuffer", py::buffer_protocol())
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.def(py::init<>())
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.def_readwrite("value", (int32_t DerivedBuffer::*) &DerivedBuffer::value)
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.def_buffer(&DerivedBuffer::get_buffer_info);
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struct BufferReadOnly {
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const uint8_t value = 0;
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BufferReadOnly(uint8_t value): value(value) {}
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py::buffer_info get_buffer_info() {
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return py::buffer_info(&value, 1);
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}
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};
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py::class_<BufferReadOnly>(m, "BufferReadOnly", py::buffer_protocol())
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.def(py::init<uint8_t>())
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.def_buffer(&BufferReadOnly::get_buffer_info);
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struct BufferReadOnlySelect {
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uint8_t value = 0;
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bool readonly = false;
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py::buffer_info get_buffer_info() {
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return py::buffer_info(&value, 1, readonly);
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}
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};
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py::class_<BufferReadOnlySelect>(m, "BufferReadOnlySelect", py::buffer_protocol())
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.def(py::init<>())
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.def_readwrite("value", &BufferReadOnlySelect::value)
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.def_readwrite("readonly", &BufferReadOnlySelect::readonly)
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.def_buffer(&BufferReadOnlySelect::get_buffer_info);
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// Expose buffer_info for testing.
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py::class_<py::buffer_info>(m, "buffer_info")
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.def(py::init<>())
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.def_readonly("itemsize", &py::buffer_info::itemsize)
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.def_readonly("size", &py::buffer_info::size)
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.def_readonly("format", &py::buffer_info::format)
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.def_readonly("ndim", &py::buffer_info::ndim)
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.def_readonly("shape", &py::buffer_info::shape)
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.def_readonly("strides", &py::buffer_info::strides)
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.def_readonly("readonly", &py::buffer_info::readonly)
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.def("__repr__", [](py::handle self) {
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return py::str("itemsize={0.itemsize!r}, size={0.size!r}, format={0.format!r}, ndim={0.ndim!r}, shape={0.shape!r}, strides={0.strides!r}, readonly={0.readonly!r}").format(self);
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})
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;
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m.def("get_buffer_info", [](py::buffer buffer) {
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return buffer.request();
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});
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}
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