如何像std C++流一样使用我的日志类？

#include<iostream>
#include <sstream>
#include<string>

class Log {
public:
    Log() : m_buffer() {}

    ~Log() {
        flush();
    }

    template<typename T>
    Log& operator<<(const T& data) {
        m_buffer<< data;
        return *this;
    }

    Log& operator<<(std::ostream& (*func)(std::ostream&)) {
        func(m_buffer);
        return *this;
    }

    void flush() {
        std::cout << m_buffer.str()<< std::endl;
        m_buffer.str("");
    }

private:
    std::stringstream m_buffer;
};

int main() {
    Log log;
    log << "Hello, " << "World!"<< std::endl;
    log << "The answer is: " << 42 << std::endl;
    return 0;
}