FreeBSD Manual Pages
std::basic_...buf::is_open(3) C++ Standard Libarystd::basic_...buf::is_open(3) NAME std::basic_filebuf::is_open - std::basic_filebuf::is_open Synopsis bool is_open() const; Returns true if the most recent call to open() succeeded and there has been no call to close() since then. Parameters (none) Return value true if the associated file is open, false otherwise. Notes This function is typically called by std::basic_fstream::is_open(). 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 See also open opens a file and configures it as the associated character se- quence (public member function) close flushes the put area buffer and closes the associated file (public member function) http://cppreference.com 2022.07.31 std::basic_...buf::is_open(3)
NAME | Synopsis | Parameters | Return value | Notes | Example | Output: | See also
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=std::wfilebuf::is_open&sektion=3&manpath=FreeBSD+Ports+15.0>