(bitmask type)

Type for opening mode flags.
  Bitmask type to store opening mode flags. The flag values can be any combination of the following constant member values:

ios_base::app(append) Seek to the end of the stream before each output operation.
ios_base::ate(at end) Seek to the end of the stream when opening.
ios_base::binaryConsider stream as binary rather than text.
ios_base::inAllow input operations on a stream.
ios_base::outAllow output operations on a stream.
ios_base::trunc(truncate) Truncate file to zero when opening.

See also.
  ios_base class

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