[C++][Python] Create Python module with C++ and boost::python

CMakeLists.txt

cmake_minimum_required(VERSION 3.10)
project(Boost_Python_Example)

# Find Boost
find_package(Boost COMPONENTS python3)

# Find Python
find_package(PythonInterp 3 REQUIRED)
find_package(PythonLibs 3 REQUIRED)
                
# Create library
add_library(mylibrary SHARED functions.cpp)

target_include_directories(mylibrary
     PRIVATE ${Boost_INCLUDE_DIRS} ${PYTHON_INCLUDE_DIRS})

target_link_libraries(mylibrary ${Boost_LIBRARIES})

# Don't use the default 'lib' prefix
set_target_properties(mylibrary PROPERTIES PREFIX "")

message("install ${Python_SITELIB}")

functions.cpp

#include <boost/python.hpp>
#include <iostream>

static int compute(int a, int b) {
    return (a + b) * (a - b );
}

static void sayHello() {
    std::cout << "Hello\n";
}

static void sayHelloTo(const std::string& person) {
    std::cout << "Hello, " << person << '\n';
}

class Printer {
public:
    Printer(const std::string& name) :
        name_m(name) {
    }
    
    void print(const std::string& text) {
        std::cout << '[' << name_m << ']' << text << '\n';
    }
    
private:
    std::string name_m;
};

BOOST_PYTHON_MODULE(mylibrary)
{
    using namespace boost::python;
    def("compute", compute);
    def("say_hello", sayHello); // Python name != C++ name
    def("sayHelloTo", sayHelloTo);
    
    class_<Printer>("Printer", init<const std::string&>())
        .def("print", &Printer::print);
}