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std::basic_ofstream::is_open

性病：基本[医]流：：is[医]开着的营业的

bool is_open(​(until C++11)
bool is_open() const;​(since C++11)

检查文件流是否有关联的文件。

有效呼叫rdbuf()->is_open()...

参数

%280%29

返回值

true如果文件流有关联的文件，false否则。

例

另见

openopens a file and associates it with the stream (public member function)
closecloses the associated file (public member function)

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