目录
奇奇怪怪的问题，初始化为0的mat会有杂像素，需要确保numpy类型正确
访问struct/class的公有非成员
对于公有非成员变量，非private的访问，pybind11提供了def_readwrite()方法来支持。具体定义如下
py::class_<Pet>(m, "Pet")
.def(py::init<const std::string &>())
.def_readwrite("name", &Pet::name)如果private 用魔法方法，或者返回值是一个引用&
py::class_<Pet>(m, "Pet")
.def(py::init<const std::string &>())
.def_property("name", &Pet::getName, &Pet::setName)
// ... remainder ...
const T Angle() const { return angle_; }
T &Angle() { return angle_; }
.def_property("Angle",
py::cpp_function(overload_cast_<>()(&AngleAxisd::Angle),
py::return_value_policy::reference),
py::cpp_function([](AngleAxisd &self, double angle) {
self.Angle() = angle;
}))添加const
struct Pet {
Pet(const std::string &name, int age) : name(name), age(age) { }
void set(int age_) { age = age_; }
void set(const std::string &name_) const { name = name_; }
std::string name;
int age;
};
template <typename... Args>
using overload_cast_ = pybind11::detail::overload_cast_impl<Args...>;
py::class_<Pet>(m, "Pet")
.def("foo", overload_cast_<int>()(&Pet::set), "Set the pet's age")
.def("foo", overload_cast_<const std::string &>()(&Pet::set,py::_const), "Set the pet's name");使用c++函数
py::cpp_function func_cpp() {
return py::cpp_function([](int i) { return i+1; },
py::arg("number"));
}
func_cpp(number=2)
3如果碰到需要返回引用的
/* Function declaration */
Data *get_data() { return _data; /* (pointer to a static data structure) */ }
...
/* Binding code */
m.def("get_data", &get_data); // <-- KABOOM, will cause crash when called from Python
# right
m.def("get_data", &get_data, py::return_value_policy::reference);
初始化写法
LineSegment(const std::string ¤t_space = "image");
LineSegment(const math::Vector2d &p1, const math::Vector2d &p2,
const std::string ¤t_space = "image");
py::class_<LineSegment, Curve2d, std::shared_ptr<LineSegment>>(
m, "LineSegment")
.def(py::init<const std::string &>(),
py::arg("current_space") = "image")
.def(py::init<const math::Vector2d &, const math::Vector2d &,
const std::string &>(),
py::arg("p1"), py::arg("p2"), py::arg("current_space") = "image")
默认参数的写法
void DrawLineSegment(image::Image &image, const shape2d::LineSegment &segment,
const std::vector<int> &color = std::vector<int>{128},
int thickness = 1);
m.def("DrawRect", &DrawRect, "draw rect to image", py::arg("image"),
py::arg("rect"), py::arg("color") = std::vector<int>{128},
py::arg("thickness") = 1);在 Python 中重写虚函数
因为py::_class默认是std::unique_ptr<Type>，如果类中有需要使用到shared_ptr那就要在继承类上加一个std::shared_ptr<Type>
Smart pointers — pybind11 documentation
class Shape2d
{
public:
Shape2d(const std::string ¤t_space = "image");
virtual ~Shape2d() = default;
virtual double GetArea() const = 0;
virtual std::shared_ptr<Shape2d>
MapShape(const math::Affine2d &dst_from_src) const = 0;
public:
std::string current_space;
};
class PyShape2d : public Shape2d
{
public:
using Shape2d::Shape2d; // Inherit constructors 内部继承初始化
double GetArea() const override
{
PYBIND11_OVERRIDE_PURE(double, Shape2d, GetArea, );
}
std::shared_ptr<Shape2d>
MapShape(const math::Affine2d &dst_from_src) const override
{
PYBIND11_OVERRIDE_PURE(std::shared_ptr<Shape2d>, Shape2d, MapShape,
dst_from_src);
}
};
py::class_<Shape2d, PyShape2d, std::shared_ptr<Shape2d>>(m, "Shape2d")
.def(py::init<const std::string &>(),
py::arg("current_space") = "image")
.def("GetArea", &Shape2d::GetArea);自动监听变化
srcdir="/mnt/c/wsl_project/smore-vision/python/smorevision"
ls ${srcdir}
inotifywait -mrq -e modify ${srcdir} \
| while read file
do
make -j8
donevscode环境变量
"cwd": "/mnt/c/wsl_project/smore-vision/python/unit_test/core/",
"python.pythonPath": "/mnt/c/wsl_project/smore-vision/python/build/smorevision/core",
"env": {"PYTHONPATH":"/mnt/c/wsl_project/smore-vision/python/build/smorevision/core"pybind11debug环境变量
{
// 使用 IntelliSense 了解相关属性。
// 悬停以查看现有属性的描述。
// 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
{
"name": "(gdb) 启动",
"type": "cppdbg",
"request": "launch",
"program": "/root/anaconda3/envs/py3/bin/python",
"args": [
"${file}"
],
"stopAtEntry": false,
"environment": [],
"externalConsole": true,
"MIMode": "gdb",
"cwd": "/mnt/c/wsl_project/smore-vision/python/unit_test/core/",
"python.pythonPath": "/mnt/c/wsl_project/smore-vision/python/build/smorevision/core",
"env": {
"PYTHONPATH": "/mnt/c/wsl_project/smore-vision/python/build/smorevision/core",
},
},
{
"name": "Python: 当前文件",
"type": "python",
"request": "launch",
"program": "${file}",
"console": "integratedTerminal",
"justMyCode": true,
"cwd": "/mnt/c/wsl_project/smore-vision/python/unit_test/core/",
"python.pythonPath": "/mnt/c/wsl_project/smore-vision/python/build/smorevision/core",
"env": {
"PYTHONPATH": "/mnt/c/wsl_project/SMore-Cls/SMore-Core:/mnt/c/wsl_project/smore-vision/python/build/smorevision/core:/mnt/c/wsl_project/smore-vision/python/build/smorevision/detection"
},
},
{
"name": "PyTest",
"type": "python",
"request": "launch",
"stopOnEntry": false,
"module": "pytest",
"args": [
"-sv",
],
"cwd": "/mnt/c/wsl_project/smore-vision/python/unit_test/core/",
"python.pythonPath": "/mnt/c/wsl_project/smore-vision/python/build/smorevision/core",
"debugOptions": [],
"env": {
"PYTHONPATH": "/mnt/c/wsl_project/smore-vision/python/build/smorevision/core"
},
}
]
}奇奇怪怪的问题，初始化为0的mat会有杂像素，需要确保numpy类型正确
绑定exception
static py::exception<MyException> ex9(m, "MyException");
py::register_exception_translator([](std::exception_ptr p) {
try
{
if (p)
{
std::rethrow_exception(p);
}
}
catch (const MyException &e)