Common lisp gray streams

Is there a tutorial on how to use gray streams?

I want to create a class开发者_如何转开发 that reads from a file while looking for a specific set of bytes. My initial thought was to use gray streams, but could not find any starting information.

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Perhaps the examples in the SBCL manual can help you for a start?

http://www.sbcl.org/manual/#Gray-Streams-examples

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I found this useful. In SBCL, gray streams are in package :GRAY.