std::ios_base::ios_base
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| public: ios_base( const ios_base& ) = delete; |
(1) | |
| protected: ios_base(); |
(2) | |
被删除的拷贝构造器：是不是复制的数据流
2) 原文：
The copy constuctor is deleted: streams are not copyable
默认的构造函数是受保护的，只有派生类构造
std::ios_base。施工后的内部状态是不确定的。派生类必须第一次使用前或析构函数之前调用basic_ios::init()完成初始化，否则该行为是未定义的.原文：
The default constructor is protected: only derived classes may construct
std::ios_base. The internal state is undefined after the construction. The derived class must call basic_ios::init() to complete initialization before first use or before destructor, otherwise the behavior is undefined.[编辑] 注释
这同样适用于在I / O层次，std::basic_ios下一个类的构造函数的。进一步派生类（std::istreamstd::ostream）总是一个具体的streambuffer的对象并调用basic_ios::init()建造，可能不止一次，完成初始化自己的虚拟基础.
原文：
The same applies to the constructors of the next class in the I/O hierarchy, std::basic_ios. Further-derived classes (std::istream and std::ostream) are always constructed with a concrete streambuffer object and call basic_ios::init(), possibly more than once, to complete initialization of their virtual base.
