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73. is_open should be const

Section: 31.10 [file.streams] Status: NAD Submitter: Matt Austern Opened: 1998-08-27 Last modified: 2017-06-15

Priority: Not Prioritized

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Discussion:

Classes basic_ifstream, basic_ofstream, and basic_fstream all have a member function is_open. It should be a const member function, since it does nothing but call one of basic_filebuf's const member functions.

Rationale:

Not a defect. This is a deliberate feature; const streams would be meaningless.