stream-peek-char Generic Function

Summary

A generic function used by peek-char that returns a character on a given stream without removing it from the stream buffer.

Package

stream

Signature

stream-peek-char stream => result

Arguments

stream⇩

A stream.

Values

result

A character or :eof.

Description

The generic function stream-peek-char is used to implement peek-char, and corresponds to a peek-type of nil. The default method specializes stream on fundamental-stream and reads a character from the stream without removing it from the stream buffer, by using stream-read-char and stream-unread-char.

See also

stream-listen
stream-read-char
stream-unread-char