获取 pybind11
可以 git submodule 添加子模块，最好固定为某个版本：
git submodule add https://github.com/pybind/pybind11.git third_party/pybind11-2.5.0
cd third_party/pybind11-2.5.0/
git checkout tags/v2.5.0
或者，直接获取源码，放进相应子目录即可。
添加进 CMake
CMakeLists.txt 里 add_subdirectory pybind11 的路径，再用其提供的 pybind11_add_module 就能创建 pybind11 的模块了。
cmake_minimum_required(VERSION 3.1)
project(start-pybind11 VERSION 0.1.0 LANGUAGES C CXX)
set(MY_PYBIND ${MY_CURR}/third_party/pybind11-2.5.0)
add_subdirectory(${MY_PYBIND})
pybind11_add_module(example_pb example_pb.cpp)
如果想在已有 C++ 动态库上扩展 pybind11 绑定，那么 target_link_libraries 链接该动态库就可以了。
target_link_libraries(example_pb PUBLIC example)
绑定一个函数
我们先实现一个 add 函数，
int add(int i, int j) {
return i + j;
}
为了简化工程，可以直接实现在 example_pb.cpp 里，
#include
namespace py = pybind11;
int add(int i, int j) {
return i + j;
}
PYBIND11_MODULE(example_pb, m) {
m.doc() = "example_pb bindings";
m.def("add", &add, "A function which adds two numbers");
}
之后，于 CMakeLists.txt 所在目录，执行 cmake 编译就完成了。
示例代码
first_steps.h
first_steps.cc
first_steps_pb.cc
绑定一个类
我们先实现一个定时触发器的类。使用如下：
#include
#include "tick.h"
int main(int argc, char const *argv[]) {
(void)argc;
(void)argv;
Tick tick(500, 5000);
tick.SetTickEvent([&tick](std::int64_t elapsed_ms) {
std::cout << "elapsed: " << elapsed_ms << " ms" << std::endl;
if (elapsed_ms >= 2000) {
tick.Stop();
}
});
tick.Start();
tick.WaitLifeOver();
return 0;
}
运行结果：
$ ./_output/bin/cpp_thread_callback/tick_test
elapsed: 0 ms
elapsed: 500 ms
elapsed: 1000 ms
elapsed: 1500 ms
elapsed: 2000 ms
该类的声明如下：
using TickEvent = std::function
using TickRunCallback = std::function
class Tick {
public:
using clock = std::chrono::high_resolution_clock;
Tick(std::int64_t tick_ms,
std::int64_t life_ms = std::numeric_limits
Tick(TickEvent tick_event, std::int64_t tick_ms,
std::int64_t life_ms = std::numeric_limits
TickRunCallback run_beg = nullptr,
TickRunCallback run_end = nullptr);
virtual ~Tick();
bool IsRunning() const;
void Start();
void Stop(bool wait_life_over = false);
const std::chrono::time_point
void SetTickEvent(TickEvent &&tick_event);
void SetTickEvent(const TickEvent &tick_event);
void SetRunBegCallback(TickRunCallback &&run_beg);
void SetRunBegCallback(const TickRunCallback &run_beg);
void SetRunEndCallback(TickRunCallback &&run_end);
void SetRunEndCallback(const TickRunCallback &run_end);
void WaitLifeOver();
protected:
// ...
};
然后， pybind11 绑定实现如下：
#include
#include
#include
#include
#include "cpp/cpp_thread_callback/tick.h"
namespace py = pybind11;
using namespace pybind11::literals; // NOLINT
PYBIND11_MODULE(tick_pb, m) {
m.doc() = "tick_pb bindings";
py::class_
.def(py::init
.def(py::init TickRunCallback, TickRunCallback>()) .def_property_readonly("is_running", &Tick::IsRunning) .def("start", &Tick::Start) .def("stop", &Tick::Stop, "wait_life_over"_a = false) .def("get_time_start", &Tick::GetTimeStart) .def("set_tick_event", [](Tick &self, const TickEvent &tick_event) { self.SetTickEvent(tick_event); }) .def("set_run_beg_callback", [](Tick &self, const TickRunCallback &run_beg) { self.SetRunBegCallback(run_beg); }) .def("set_run_end_callback", [](Tick &self, const TickRunCallback &run_end) { self.SetRunEndCallback(run_end); }) .def("wait_life_over", &Tick::WaitLifeOver, py::call_guard } 编译出动态库后，把路径添加进 PYTHONPATH： export PYTHONPATH= # 依赖其他动态库的话，把路径添加进 LIBRARY_PATH # Linux export LD_LIBRARY_PATH= # macOS export DYLD_LIBRARY_PATH= 之后，就可以于 Python 里调用了： #!/usr/bin/env python # -*- coding: utf-8 -*- # pylint: disable=missing-docstring, import-error import tick_pb as tick def _main(): t = tick.Tick(lambda elapsed_ms: print(f"elapsed: {elapsed_ms} ms"), 500, 1000, lambda: print("run beg"), lambda: print("run end")) t.start() t.wait_life_over() if __name__ == "__main__": _main() 运行结果： $ python src/pybind/cpp_thread_callback/tick_test.py run beg elapsed: 0 ms elapsed: 500 ms elapsed: 1000 ms run end 示例代码 tick.h tick.cc tick_test.cc tick_pb.cc tick_test.py 运行示例代码 获取代码， git clone https://github.com/ikuokuo/start-pybind11.git # 获取子模块 cd start-pybind11/ git submodule update --init 编译安装， # 依赖 cmake cd start-pybind11/ make install 编译结果， $ tree _install _install ├── bin │ └── cpp_thread_callback │ └── tick_test └── lib ├── cpp_thread_callback │ ├── libtick.0.1.0.dylib │ ├── libtick.0.1.dylib -> libtick.0.1.0.dylib │ ├── libtick.dylib -> libtick.0.1.dylib │ ├── tick_pb.0.1.0.cpython-37m-darwin.so │ ├── tick_pb.0.1.cpython-37m-darwin.so -> tick_pb.0.1.0.cpython-37m-darwin.so │ └── tick_pb.cpython-37m-darwin.so -> tick_pb.0.1.cpython-37m-darwin.so └── first_steps ├── first_steps_pb.0.1.0.cpython-37m-darwin.so ├── first_steps_pb.0.1.cpython-37m-darwin.so -> first_steps_pb.0.1.0.cpython-37m-darwin.so ├── first_steps_pb.cpython-37m-darwin.so -> first_steps_pb.0.1.cpython-37m-darwin.so ├── libfirst_steps.0.1.0.dylib ├── libfirst_steps.0.1.dylib -> libfirst_steps.0.1.0.dylib └── libfirst_steps.dylib -> libfirst_steps.0.1.dylib 5 directories, 13 files 添加路径， $ source setup.bash first_steps cpp_thread_callback DYLD_LIBRARY_PATH, PYTHONPATH + /Users/John/Workspace/Self/ikuokuo/start-pybind11/_install/lib/first_steps + /Users/John/Workspace/Self/ikuokuo/start-pybind11/_install/lib/cpp_thread_callback 运行示例， $ python src/pybind/cpp_thread_callback/tick_test.py run beg elapsed: 0 ms elapsed: 500 ms elapsed: 1000 ms run end 深圳网站建设www.sz886.com