# std::basic_ofstream<CharT,Traits>::is_open

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< cpp‎ | io‎ | basic ofstream

bool is_open() const; |  |

Checks if the file stream has an associated file.

Effectively calls `rdbuf()->is_open()`.

### Parameters

(none)

### Return value

true if the file stream has an associated file, false otherwise.

### Example

| This section is incomplete Reason: no example

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 365 | C++98 | `is_open` was not declared with const qualifier | declared with const qualifier

### See also

open | opens a file and associates it with the stream (public member function)
close | closes the associated file (public member function)

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