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### posix::descriptor_base

The descriptor_base class is used as a base for the basic_stream_descriptor class template so that we have a common place to define the associated IO control commands.

    class descriptor_base

##### Types

Name | Description
--- | ---
bytes_readable | IO control command to get the amount of data that can be read without blocking.
non_blocking_io | IO control command to set the blocking mode of the descriptor.

##### Protected Member Functions

Name | Description
--- | ---
~descriptor_base | Protected destructor to prevent deletion through this type.