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# The new input/output classes

The iostream classes implement most of the features of AT&T version 2.0 iostream library classes, and most of the features of the ANSI X3J16 library draft (which is based on the AT&T design). These classes are available in `libg++` for convenience and for compatibility with older releases; however, since the iostream classes are licensed under less stringent terms than `libg++`, they are now also available in a separate library called `libio`---and documented in a separate manual, corresponding to that library.

See section `Introduction' in The GNU C++ Iostream Library.

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