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分享std::ostream & operator << (std::ostream &out, myInteger myclass)std::ostream & operator << (std::ostream &out, myInteger &&myclass) // 右值引用
std::ostream & operator << (std::ostream &out, myInteger &myclass) // 左值引用std::ostream & operator << (std::ostream &out, const myInteger &myclass)template<class T>
std::ostream & operator << (std::ostream &out, T &&myclass)
{
out << std::forward<T>(myclass).m_int;
return out;
}