3rdParty/boost/1.78.0/libs/iostreams/doc/concepts/direct.html
A Device is Direct if it provides access to its controlled sequences as in-memory arrays rather than via a socket-like interface. The difference between a Device which is Direct and one which is not is reflected in the specifications of the various Device refinements, e.g., Source and Sink.
A model of Device which does not model Direct is called indirect.
Same as Device, with the following additional requirements:
| Category | A type convertible to device_tag and to direct_tag |
Same as Device.
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