1 files changed, 195 insertions, 0 deletions
diff --git a/3rdparty/pybind11/tests/test_buffers.cpp b/3rdparty/pybind11/tests/test_buffers.cpp
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+++ b/3rdparty/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_tests.h"
+#include "constructor_stats.h"
+
+TEST_SUBMODULE(buffers, m) {
+    // test_from_python / test_to_python:
+    class Matrix {
+    public:
+        Matrix(ssize_t rows, ssize_t cols) : m_rows(rows), m_cols(cols) {
+            print_created(this, std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
+            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");
+            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) : 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) {
+            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) {
+            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()(ssize_t i, ssize_t j) const {
+            return m_data[(size_t) (i*m_cols + j)];
+        }
+
+        float &operator()(ssize_t i, ssize_t j) {
+            return m_data[(size_t) (i*m_cols + j)];
+        }
+
+        float *data() { return m_data; }
+
+        ssize_t rows() const { return m_rows; }
+        ssize_t cols() const { return m_cols; }
+    private:
+        ssize_t m_rows;
+        ssize_t m_cols;
+        float *m_data;
+    };
+    py::class_<Matrix>(m, "Matrix", py::buffer_protocol())
+        .def(py::init<ssize_t, ssize_t>())
+        /// Construct from a buffer
+        .def(py::init([](py::buffer const 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<ssize_t, 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<ssize_t, 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:
+        SquareMatrix(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<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;
+        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);
+
+}