std::basic_ofstream::is_open
bool is_open(); | | (until C++11) |
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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
open | opens a file and associates it with the stream (public member function) |
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close | closes the associated file (public member function) |
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