std::basic_filebuf<CharT,Traits>::is_open
From cppreference.com
< cpp | io | basic filebuf
bool is_open()const; | ||
Returns true if the most recent call to open() succeeded and there has been no call to close() since then.
Contents |
[edit]Parameters
(none)
[edit]Return value
true if the associated file is open, false otherwise.
[edit]Notes
This function is typically called by std::basic_fstream::is_open().
[edit]Example
Run this code
#include <fstream>#include <iostream> int main(){std::ifstream fs("test.txt");std::filebuf fb; fb.open("test.txt", std::ios_base::in);std::cout<<std::boolalpha<<"direct call: "<< fb.is_open()<<'\n'<<"through streambuf: "<< fs.rdbuf()->is_open()<<'\n'<<"through fstream: "<< fs.is_open()<<'\n';}
Output:
direct call: true through streambuf: true through fstream: true
[edit]See also
| opens a file and configures it as the associated character sequence (public member function) | |
| flushes the put area buffer and closes the associated file (public member function) |
