Return type: Boolean
Returns:       

Returns true if the stream is opened as a buffer, and false otherwise. Replacing is with isnt will reverse the results.

  stream-name indexer? (is | isnt) buffer

You can use is buffer to test a stream variable to determine if it was opened as a buffer.

Related Syntax    open

[ INDEX ] [ CONCEPTS ] [ TASKS ] [ SYNTAX ] [ LIBRARIES ] [ LEGACYLIBRARIES ] [ ERRORS ]