The Microsoft Input/Output Stream Classes (iostream.hlp) (Table of Contents; Topic list)
filebuf::is_open
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──The Microsoft iostream Classes────────────────────────────────────────────
 
  int is_open() const;
 
  Remarks
 
  Returns a nonzero value if this filebuf object is attached to an open
  disk file identified by a file descriptor; otherwise 0.
 
  See Also
 
  ◄filebuf::open►
 
 
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