IO Stream Objects

See Figure 8.17 for the derivation hierarchy of the Stream classes.

**Figure 8.17:** Stream variants
$\includegraphics{hdr/stream.ps}$

**Figure 8.18:** IO channel abstraction

See Figure 8.18 for the derivation hierarchy for IO channel abstraction.

See Figure 8.19

**Figure 8.19:** Mapper hierarchy
$\includegraphics{hdr/mapper.ps}$

Bill Pippin 2010-01-14