ios_base::openmode

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ios_base::openmode

typedef T3 openmode;
static const openmode app, ate, binary, in, out, trunc;

The type is an enumerated type T3 that describes an object that can store the opening mode for several iostreams objects. The distinct flag values are:

  • app, to seek to the end of a stream before each insertion
  • ate, to seek to the end of a stream when its controlling object is first created
  • binary, to read a file as a binary stream, rather than as a text stream
  • in, to permit extraction from a stream
  • out, to permit insertion to a stream
  • trunc, to truncate an existing file when its controlling object is first created