Boost Python官方样例（一），,配置环境$ cat

Boost Python官方样例（一），,配置环境$ cat

配置环境

$ cat /etc/os-releaseNAME="Ubuntu"VERSION="16.04 LTS (Xenial Xerus)"ID=ubuntuID_LIKE=debianPRETTY_NAME="Ubuntu 16.04 LTS"VERSION_ID="16.04"HOME_URL="http://www.ubuntu.com/"SUPPORT_URL="http://help.ubuntu.com/"BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"UBUNTU_CODENAME=xenial# apt install libboost-python-dev cmake

导出C++函数

创建工程目录

$ mkdir Lesson1$ cd Lesson1

编写C++函数实现

$ vim greet.cppchar const* greet(){    return "hello world";}

编写Boost.Python文件

$ vim greet_wrapper.cpp#include <boost/python.hpp>#include "greet.cpp"BOOST_PYTHON_MODULE(hello_ext){    using namespace boost::python;    def("greet", greet);}

为库编写CMakeLists.txt

$ vim CMakeLists.txtcmake_minimum_required(VERSION 2.8)project(greet)### 此处的动态库名必须和BOOST_PYTHON_MODULE()中定义的保持一致，即最后生成的库必须名为hello_ext.soset(greetSRC greet_wrapper.cpp)add_library(hello_ext SHARED ${greetSRC})set_target_properties(hello_ext PROPERTIES PREFIX "")#dependenciesINCLUDE(FindPkgConfig)pkg_check_modules(PYTHON REQUIRED python)include_directories(/usr/include ${PYTHON_INCLUDE_DIRS})target_link_libraries(hello_ext boost_python)

编译库

$ mkdir build$ cd build$ cmake ..$ make

运行python测试库文件

### 在build目录下执行，即hello_ext.so存在的目录（可以将so移至其他目录，这样就可以在其他目录下打开python终端）$ python>>> import hello_ext>>> help(hello_ext)>>> hello_ext.greet()‘hello world‘

导出C++类

编写C++类实现

$ vim world.h#include <string.h>struct World{    void set(std::string msg) { this->msg = msg; }    std::string greet() { return msg; }    std::string msg;};

编写Boost.Python文件

$ vim world_wrapper.cpp#include <boost/python.hpp>#include "world.h"using namespace boost::python;BOOST_PYTHON_MODULE(hello){    class_<World>("World")        .def("greet", &World::greet)        .def("set", &World::set)    ;}

运行python测试库文件

$ python>>> import hello>>> planet = hello.World()>>> planet.set(‘howdy‘)>>> planet.greet()‘howdy‘

导出C++类(带构造函数)

编写C++类实现

$ cat world.h#include <string.h>struct World{    World(std::string msg): msg(msg) {} // added constructor    void set(std::string msg) { this->msg = msg; }    std::string greet() { return msg; }    std::string msg;};

编写Boost.Python文件

$ vim world_wrapper.cpp#include <boost/python.hpp>#include "world.h"using namespace boost::python;BOOST_PYTHON_MODULE(hello){    class_<World>("World", init<std::string>())        .def("greet", &World::greet)        .def("set", &World::set)    ;}

运行python测试库文件

>>> import hello>>> planet = hello.World("test")>>> planet.greet()‘test‘

导出C++类(带数据成员)

编写C++类实现

$ vim var.h#include <string.h>struct Var{    Var(std::string name) : name(name), value() {}    std::string const name;    float value;};

编写Boost.Python文件

$ vim var_wrapper.cpp#include <boost/python.hpp>#include "var.h"using namespace boost::python;BOOST_PYTHON_MODULE(hello){    class_<Var>("Var", init<std::string>())        .def_readonly("name", &Var::name)        .def_readwrite("value", &Var::value);}

运行python测试库文件

>>> import hello>>> x = hello.Var(‘pi‘)>>> x.value = 3.14>>> print x.name, ‘is around‘, x.valuepi is around 3.1400001049

Boost Python官方样例（一）