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--- youtube:python-mixing-006 [2024/02/28 18:26] – 削除 - 外部編集 (不明な日付) 127.0.0.1
+++ youtube:python-mixing-006 [2024/02/28 18:26] (現在) – ↷ toybox:python-mixing-006 から youtube:python-mixing-006 へページを移動しました。 freemikan
@@ 行 1: / 行 1: @@
+====== pybind11を使ってみる ======
+作成日: 2023-08-10 (木)
+[[https://youtu.be/PXEZhuwq0xA|第6回 pybind11を使ってみる]]
+プロジェクトレイアウト
+  .
+  └── pybind11-examples/
+      ├── simple/
+      │   ├── simple.cpp
+      │   └── Makefile
+      └── fakegfx/
+          ├── fakegfx.cpp
+          ├── sample.py
+          └── Makefile
+===== simple =====
+==== simple.cpp ====
+<file cpp>
+#define _hypot hypot // work-around for Python 3.6 and Mingw-w64 11.0.0
+#include <pybind11/pybind11.h>
+namespace py = pybind11;
+#include <string_view>
+#include <format>
+#include <iostream>
+namespace s {
+struct ZeroDivisionError : std::runtime_error {
+    using std::runtime_error::runtime_error;
+};
+void greet(std::string_view who) {
+    std::cout << std::format("Hello, {}!\n", who);
+}
+int add(int a, int b) {
+    return a + b;
+}
+int sub(int a, int b) {
+    return a - b;
+}
+int mul(int a, int b) {
+    return a * b;
+}
+int div(int a, int b) {
+    if (b == 0) {
+        throw ZeroDivisionError{"division by zero"};
+    }
+    return a / b;
+}
+} // ns s
+PYBIND11_MODULE(simple, m) {
+    m.def("greet", &s::greet, "Greet to user with Hello.");
+    m.def("add", &s::add, "Add first and second numbers.");
+    m.def("sub", &s::sub, "Subtract second number from first one.");
+    m.def("mul", &s::mul, "Multiply first and second numbers.");
+    m.def("div", &s::div, "Divide first number by second one.");
+    py::register_exception<s::ZeroDivisionError>(m, "ZeroDivisionError", PyExc_ZeroDivisionError);
+}
+</file>
+==== Makefile ====
+<file Makefile>
+MODNAME = simple
+PYBIND11_INCLUDES = $(shell pybind11-config --includes)
+CXXFLAGS = -Wall -std=c++20 -fPIC ${PYBIND11_INCLUDES}
+LDFLAGS = -LC:\Python36\libs
+LDLIBS = -lpython36
+all: ${MODNAME}.pyd
+${MODNAME}.pyd: ${MODNAME}.o
+	${CXX} -shared ${CXXFLAGS} -o $@ $< ${LDFLAGS} ${LDLIBS}
+${MODNAME}.o: ${MODNAME}.cpp
+	${CXX} -c ${CXXFLAGS} -o $@ $<
+</file>
+===== fakegfx =====
+==== fakegfx.cpp ====
+<file cpp>
+#define _hypot hypot  // work-around for Python 3.6 and Mingw-w64 11.0.0
+#include <pybind11/pybind11.h>
+namespace py = pybind11;
+#include <iostream>
+namespace g {
+class Shape {
+public:
+    virtual ~Shape() = default;
+    virtual void draw() const = 0;
+};
+class RectangleShape : public Shape {
+public:
+    void draw() const override {
+        std::cout << "+---------+\n"
+                  << "|         |\n"
+                  << "|         |\n"
+                  << "+---------+\n";
+    }
+};
+void draw_shape(Shape const &shape) {
+    shape.draw();
+}
+// trampolines that redirects virtual call back to Python
+class PyShape : public Shape {
+public:
+    using Shape::Shape;
+    void draw() const override {
+        PYBIND11_OVERRIDE_PURE(
+            void,  // return type
+            Shape, // parent type
+            draw,  // method name
+        );
+    }
+};
+class PyRectangleShape : public RectangleShape {
+public:
+    using RectangleShape::RectangleShape;
+    void draw() const override {
+        PYBIND11_OVERRIDE(void, RectangleShape, draw);
+    }
+};
+} // namespace g
+PYBIND11_MODULE(fakegfx, m) {
+    py::class_<g::Shape, g::PyShape>(m, "Shape")
+        .def(py::init())
+        .def("draw", &g::Shape::draw);
+    py::class_<g::RectangleShape, g::Shape, g::PyRectangleShape>(m, "RectangleShape")
+        .def(py::init())
+        .def("draw", &g::RectangleShape::draw);
+    m.def("draw_shape", &g::draw_shape);
+}
+</file>
+==== sample.py ====
+<file python>
+import fakegfx
+class CircleShape(fakegfx.Shape):
+    def draw(self):
+        print("o")
+class XRectangleShape(fakegfx.RectangleShape):
+    def draw(self):
+        print("x x x x x x")
+        print("x         x")
+        print("x         x")
+        print("x x x x x x")
+</file>
+==== Makefile ====
+<file Makefile>
+MODNAME = fakegfx
+PYBIND11_INCLUDES = $(shell pybind11-config --includes)
+CXXFLAGS = -Wall -std=c++20 -fPIC ${PYBIND11_INCLUDES}
+LDFLAGS = -LC:\Python36\libs
+LDLIBS = -lpython36
+all: ${MODNAME}.pyd
+${MODNAME}.pyd: ${MODNAME}.o
+	${CXX} -shared ${CXXFLAGS} -o $@ $< ${LDFLAGS} ${LDLIBS}
+${MODNAME}.o: ${MODNAME}.cpp
+	${CXX} -c ${CXXFLAGS} -o $@ $<
+</file>