如何将boost :: any打印到流中？

#include<iostream>
#include<boost/any.hpp>
#include<boost/lexical_cast.hpp>

int main() {
    boost::any any_value = 42;

    // 将boost::any转换为字符串
    std::string str_value = boost::lexical_cast<std::string>(boost::any_cast<int>(any_value));

    // 打印字符串到流中
    std::cout<< str_value<< std::endl;

    return 0;
}