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pybind11/tests/test_buffers.cpp

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/*
tests/test_buffers.cpp -- supporting Pythons' buffer protocol
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 <pybind11/complex.h>
#include <pybind11/stl.h>
#include "constructor_stats.h"
#include "pybind11_tests.h"
TEST_SUBMODULE(buffers, m) {
m.attr("std_is_same_double_long_double") = std::is_same<double, long double>::value;
m.def("format_descriptor_format_buffer_info_compare",
[](const std::string &cpp_name, const py::buffer &buffer) {
// https://google.github.io/styleguide/cppguide.html#Static_and_Global_Variables
static auto *format_table = new std::map<std::string, std::string>;
static auto *compare_table
= new std::map<std::string, bool (*)(const py::buffer_info &)>;
if (format_table->empty()) {
#define PYBIND11_ASSIGN_HELPER(...) \
(*format_table)[#__VA_ARGS__] = py::format_descriptor<__VA_ARGS__>::format(); \
(*compare_table)[#__VA_ARGS__] = py::buffer_info::compare<__VA_ARGS__>;
PYBIND11_ASSIGN_HELPER(PyObject *)
PYBIND11_ASSIGN_HELPER(bool)
PYBIND11_ASSIGN_HELPER(std::int8_t)
PYBIND11_ASSIGN_HELPER(std::uint8_t)
PYBIND11_ASSIGN_HELPER(std::int16_t)
PYBIND11_ASSIGN_HELPER(std::uint16_t)
PYBIND11_ASSIGN_HELPER(std::int32_t)
PYBIND11_ASSIGN_HELPER(std::uint32_t)
PYBIND11_ASSIGN_HELPER(std::int64_t)
PYBIND11_ASSIGN_HELPER(std::uint64_t)
PYBIND11_ASSIGN_HELPER(float)
PYBIND11_ASSIGN_HELPER(double)
PYBIND11_ASSIGN_HELPER(long double)
PYBIND11_ASSIGN_HELPER(std::complex<float>)
PYBIND11_ASSIGN_HELPER(std::complex<double>)
PYBIND11_ASSIGN_HELPER(std::complex<long double>)
#undef PYBIND11_ASSIGN_HELPER
}
return std::pair<std::string, bool>((*format_table)[cpp_name],
(*compare_table)[cpp_name](buffer.request()));
});
// test_from_python / test_to_python:
class Matrix {
public:
Matrix(py::ssize_t rows, py::ssize_t cols) : m_rows(rows), m_cols(cols) {
print_created(this, std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
// NOLINTNEXTLINE(cppcoreguidelines-prefer-member-initializer)
m_data = new float[(size_t) (rows * cols)];
memset(m_data, 0, sizeof(float) * (size_t) (rows * cols));
}
Matrix(const Matrix &s) : m_rows(s.m_rows), m_cols(s.m_cols) {
print_copy_created(this,
std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
// NOLINTNEXTLINE(cppcoreguidelines-prefer-member-initializer)
m_data = new float[(size_t) (m_rows * m_cols)];
memcpy(m_data, s.m_data, sizeof(float) * (size_t) (m_rows * m_cols));
}
Matrix(Matrix &&s) noexcept : m_rows(s.m_rows), m_cols(s.m_cols), m_data(s.m_data) {
print_move_created(this);
s.m_rows = 0;
s.m_cols = 0;
s.m_data = nullptr;
}
~Matrix() {
print_destroyed(this,
std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
delete[] m_data;
}
Matrix &operator=(const Matrix &s) {
if (this == &s) {
return *this;
}
print_copy_assigned(this,
std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
delete[] m_data;
m_rows = s.m_rows;
m_cols = s.m_cols;
m_data = new float[(size_t) (m_rows * m_cols)];
memcpy(m_data, s.m_data, sizeof(float) * (size_t) (m_rows * m_cols));
return *this;
}
Matrix &operator=(Matrix &&s) noexcept {
print_move_assigned(this,
std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
if (&s != this) {
delete[] m_data;
m_rows = s.m_rows;
m_cols = s.m_cols;
m_data = s.m_data;
s.m_rows = 0;
s.m_cols = 0;
s.m_data = nullptr;
}
return *this;
}
float operator()(py::ssize_t i, py::ssize_t j) const {
return m_data[(size_t) (i * m_cols + j)];
}
float &operator()(py::ssize_t i, py::ssize_t j) {
return m_data[(size_t) (i * m_cols + j)];
}
float *data() { return m_data; }
py::ssize_t rows() const { return m_rows; }
py::ssize_t cols() const { return m_cols; }
private:
py::ssize_t m_rows;
py::ssize_t m_cols;
float *m_data;
};
py::class_<Matrix>(m, "Matrix", py::buffer_protocol())
.def(py::init<py::ssize_t, py::ssize_t>())
/// Construct from a buffer
.def(py::init([](const py::buffer &b) {
py::buffer_info info = b.request();
if (info.format != py::format_descriptor<float>::format() || info.ndim != 2) {
throw std::runtime_error("Incompatible buffer format!");
}
auto *v = new Matrix(info.shape[0], info.shape[1]);
memcpy(v->data(), info.ptr, sizeof(float) * (size_t) (v->rows() * v->cols()));
return v;
}))
.def("rows", &Matrix::rows)
.def("cols", &Matrix::cols)
/// Bare bones interface
.def("__getitem__",
[](const Matrix &m, std::pair<py::ssize_t, py::ssize_t> i) {
if (i.first >= m.rows() || i.second >= m.cols()) {
throw py::index_error();
}
return m(i.first, i.second);
})
.def("__setitem__",
[](Matrix &m, std::pair<py::ssize_t, py::ssize_t> i, float v) {
if (i.first >= m.rows() || i.second >= m.cols()) {
throw py::index_error();
}
m(i.first, i.second) = v;
})
/// Provide buffer access
.def_buffer([](Matrix &m) -> py::buffer_info {
return py::buffer_info(
m.data(), /* Pointer to buffer */
{m.rows(), m.cols()}, /* Buffer dimensions */
{sizeof(float) * size_t(m.cols()), /* Strides (in bytes) for each index */
sizeof(float)});
});
// test_inherited_protocol
class SquareMatrix : public Matrix {
public:
explicit SquareMatrix(py::ssize_t n) : Matrix(n, n) {}
};
// Derived classes inherit the buffer protocol and the buffer access function
py::class_<SquareMatrix, Matrix>(m, "SquareMatrix").def(py::init<py::ssize_t>());
// test_pointer_to_member_fn
// Tests that passing a pointer to member to the base class works in
// the derived class.
struct Buffer {
int32_t value = 0;
py::buffer_info get_buffer_info() {
return py::buffer_info(
&value, sizeof(value), py::format_descriptor<int32_t>::format(), 1);
}
};
py::class_<Buffer>(m, "Buffer", py::buffer_protocol())
.def(py::init<>())
.def_readwrite("value", &Buffer::value)
.def_buffer(&Buffer::get_buffer_info);
class ConstBuffer {
std::unique_ptr<int32_t> value;
public:
int32_t get_value() const { return *value; }
void set_value(int32_t v) { *value = v; }
py::buffer_info get_buffer_info() const {
return py::buffer_info(
value.get(), sizeof(*value), py::format_descriptor<int32_t>::format(), 1);
}
ConstBuffer() : value(new int32_t{0}) {}
};
py::class_<ConstBuffer>(m, "ConstBuffer", py::buffer_protocol())
.def(py::init<>())
.def_property("value", &ConstBuffer::get_value, &ConstBuffer::set_value)
.def_buffer(&ConstBuffer::get_buffer_info);
struct DerivedBuffer : public Buffer {};
py::class_<DerivedBuffer>(m, "DerivedBuffer", py::buffer_protocol())
.def(py::init<>())
.def_readwrite("value", (int32_t DerivedBuffer::*) &DerivedBuffer::value)
.def_buffer(&DerivedBuffer::get_buffer_info);
struct BufferReadOnly {
const uint8_t value = 0;
explicit BufferReadOnly(uint8_t value) : value(value) {}
py::buffer_info get_buffer_info() { return py::buffer_info(&value, 1); }
};
py::class_<BufferReadOnly>(m, "BufferReadOnly", py::buffer_protocol())
.def(py::init<uint8_t>())
.def_buffer(&BufferReadOnly::get_buffer_info);
struct BufferReadOnlySelect {
uint8_t value = 0;
bool readonly = false;
py::buffer_info get_buffer_info() { return py::buffer_info(&value, 1, readonly); }
};
py::class_<BufferReadOnlySelect>(m, "BufferReadOnlySelect", py::buffer_protocol())
.def(py::init<>())
.def_readwrite("value", &BufferReadOnlySelect::value)
.def_readwrite("readonly", &BufferReadOnlySelect::readonly)
.def_buffer(&BufferReadOnlySelect::get_buffer_info);
// Expose buffer_info for testing.
py::class_<py::buffer_info>(m, "buffer_info")
.def(py::init<>())
.def_readonly("itemsize", &py::buffer_info::itemsize)
.def_readonly("size", &py::buffer_info::size)
.def_readonly("format", &py::buffer_info::format)
.def_readonly("ndim", &py::buffer_info::ndim)
.def_readonly("shape", &py::buffer_info::shape)
.def_readonly("strides", &py::buffer_info::strides)
.def_readonly("readonly", &py::buffer_info::readonly)
.def("__repr__", [](py::handle self) {
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);
});
m.def("get_buffer_info", [](const py::buffer &buffer) { return buffer.request(); });
}
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