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std::basic_filebuf::overflow

性病：基本[医]filebuf：：溢出

protected: virtual int_type overflow ( int_type c = Traits::eof() ​​

将一些数据从PUT区域写入关联字符序列%28到文件%29。

行为类似于基类。std::basic_streambuf::overflow，除了写入数据，首先使用std::codecvt::out将字符转换为外部的%28---可能是多字节%29---表示的区域设置，存储在临时缓冲区%28中，根据需要分配%29，然后使用文件I/O将所有完全转换的字节复制到文件中。

如果std::codecvt::always_noconv是真的，调用std::codecvt::out可能会被跳过。

如果转换失败，则使用std::codecvt_base::error、回报Traits::eof()而不尝试任何输出。

如果关联文件未打开%28is_open() == false%29，回报Traits::eof()在做任何事之前。

参数

%280%29

返回值

Traits::not_eof(c)表示成功或Traits::eof()表示失败。

例

另见

overflow virtualwrites characters to the associated output sequence from the put area (virtual protected member function of std::basic_streambuf)
underflow virtualreads from the associated file (virtual protected member function)

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