ostream 重载中的缓冲区刷新

Question

What is the recommended way to use buffer flushing when overloading ostream in C++? Do I just disable buffer flushing in the beginning and enable it in the end? If so should i flush the buffer before returning the ostream? I have never seen this part mentioned in any ostream overloading reference. EDIT: Lets say i have a class with a lot of members. The ostream operator prints each member. How should i write the ostream overload?

struct ToPrint {
char firstMember;
char secondMember;
int number;
};

std::ostream& operator<<(std::ostream& os, const ToPrint& instance) {
    os << instance.firstMember << '\n'
        << instance.secondMember << '\n';
    if (instance.number > 0)
        os << instance.number << '\n';
    return os;
}

Answer 1

The recommended use of buffer flushing for output streams in C++ is to not do it. Unless you have special requirements, the default behavior of the stream will work just fine.