如何使用C++以跨平台方式检查操作系统版本？

#include<iostream>
#include<boost/predef.h>

int main() {
    std::cout << "操作系统: ";

#if BOOST_OS_WINDOWS
    std::cout << "Windows";
#elif BOOST_OS_LINUX
    std::cout << "Linux";
#elif BOOST_OS_MACOS
    std::cout << "macOS";
#elif BOOST_OS_IOS
    std::cout << "iOS";
#elif BOOST_OS_ANDROID
    std::cout << "Android";
#else
    std::cout << "未知操作系统";
#endif

    std::cout<< std::endl;
    return 0;
}