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void fun(ostream &os) //可以
main中，ostream &os //不可以，为什么？ostream os //不可以，为什么
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见std::ostream::ostreaminitialization (1) explicit ostream (streambuf* sb);copy (2) ostream& (const ostream&) = delete;move (3) protected: ostream& (ostream&& x);
没有无参数构造函数。拷贝构造被标记为已删除。
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见std::ostream::ostream
initialization (1)
explicit ostream (streambuf* sb);
copy (2)
ostream& (const ostream&) = delete;
move (3)
protected: ostream& (ostream&& x);
没有无参数构造函数。拷贝构造被标记为已删除。