The Microsoft Input/Output Stream Classes (iostream.hlp) (Table of Contents; Topic list)
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is_open
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──The Microsoft iostream Classes────────────────────────────────────────────
 
  The identifier you have selected corresponds to member functions in
  several iostream classes. Select the specific function you want from the
  list below:
 
     ◄filebuf::is_open►
 
     ◄fstream::is_open►
 
     ◄ifstream::is_open►
 
     ◄ofstream::is_open►
 
 
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