Symbols

SYMBOLS

• self - the current object (within a method context)
• *obarray* - the object hash table
• *standard-input* - the standard input stream
• *standard-output* - the standard output stream
• *error-output* - the error output stream
• *trace-output* - the trace output stream
• *debug-io* - the debug i/o stream
• *breakenable* - flag controlling entering break loop on errors
• *tracelist* - list of names of functions to trace
• *tracenable* - enable trace back printout on errors
• *tracelimit* - number of levels of trace back information
• *evalhook* - user substitute for the evaluator function
• *applyhook* - (not yet implemented)
• *readtable* - the current readtable
• *unbound* - indicator for unbound symbols
• *gc-flag* - controls the printing of gc messages
• *gc-hook* - function to call after garbage collection
• *integer-format* - format for printing integers ("%d" or "%ld")
• *float-format* - format for printing floats ("%g")
• *print-case* - symbol output case (:upcase or :downcase)

There are several symbols maintained by the read/eval/print loop. The symbols '+', '++', and '+++' are bound to the most recent three input expressions. The symbols '*', '**' and '***' are bound to the most recent three results. The symbol '-' is bound to the expression currently being evaluated. It becomes the value of '+' at the end of the evaluation.