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460. Default modes missing from basic_fstream member specifications

Section: 31.10[file.streams]Status:CD1Submitter: Ben HutchingsOpened: 2004-04-01Last modified: 2017-06-15

Priority:Not Prioritized

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Discussion:

The second parameters of the non-default constructor and of the openmember function for basic_fstream, named "mode", are optionalaccording to the class declaration in 27.8.1.11 [lib.fstream]. Thespecifications of these members in 27.8.1.12 [lib.fstream.cons] and27.8.1.13 lib.fstream.members] disagree with this, though theconstructor declaration has the "explicit" function-specifier implyingthat it is intended to be callable with one argument.

Proposed resolution:

In 31.10.6.2[fstream.cons], change

  explicit basic_fstream(const char* s, ios_base::openmode mode);

to

  explicit basic_fstream(const char* s,                         ios_base::openmode mode = ios_base::in|ios_base::out);

In 31.10.6.4[fstream.members], change

  void open(const char*s, ios_base::openmode mode);

to

  void open(const char*s,            ios_base::openmode mode = ios_base::in|ios_base::out);