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std::basic_fstream::close(3)   C++ Standard Libary  std::basic_fstream::close(3)

NAME
     std::basic_fstream::close - std::basic_fstream::close

Synopsis
	void close();

	Closes the associated file.

	Effectively calls rdbuf()->close(). If an error occurs during operation,
	setstate(failbit) is called.

Parameters
	(none)

Return value
	(none)

Notes
	This  function	is  called  by	the destructor of basic_fstream when the
     stream object
	goes out of scope and is not usually invoked directly.

Example
     // Run this code

      #include <fstream>
      #include <iostream>
      #include <string>

      int main()
      {
	  std::fstream f1("example1", std::ios::out),
		       f2("example2", std::ios::out),
		       f3("example3", std::ios::out);

	  std::cout << std::boolalpha
		    << f1.is_open() << '\n'
		    << f2.is_open() << '\n'
		    << f3.is_open() << '\n';

	  f1.close();
	  f2.close();

	  std::cout << f1.is_open() << '\n'
		    << f2.is_open() << '\n'
		    << f3.is_open() << '\n';
      }

Possible output:
      true
      true
      true
      false
      false
      true

See also
	is_open checks if the stream has an associated file
		(public member function)
	open	opens a file and associates it with the stream
		(public member function)
	close	flushes the put area buffer and closes the associated file
		(public member function of std::basic_filebuf<CharT,Traits>)

http://cppreference.com 	   2024.06.10	    std::basic_fstream::close(3)
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