2.6. Sharpsign

2.6. Sharpsign
Prev	Chapter 2. Syntax	Next

2.6. Sharpsign [sec_2-4-8]

Reader macros are also defined for the following:

Additional reader macros

#,: load-time evaluation, kept despite the [ANSI CL standard] issue SHARP-COMMA-CONFUSION:REMOVE.
#Y: compiled FUNCTION objects and input STREAM's EXT:ENCODINGs
#"": PATHNAME: #"test.lisp" is the value of (PATHNAME "test.lisp")

#\Code allows input of characters of arbitrary code: e.g., #\Code231 reads as the character (CODE-CHAR 231).

This is the list of objects whose external representation cannot be meaningfully read in:

Unreadable objects

#<type ...>: all STRUCTURE-OBJECTs lacking a keyword constructor
#<ARRAY type dimensions>: all ARRAYs except STRINGs, if *PRINT-ARRAY* is NIL
#<SYSTEM-FUNCTION name>: built-in function written in C
#<ADD-ON-SYSTEM-FUNCTION name>: module function written in C
#<SPECIAL-OPERATOR name>: special operator handler
#<COMPILED-CLOSURE name>: compiled function, if CUSTOM:*PRINT-CLOSURE* is NIL
#<CLOSURE name ...>: interpreted function
#<FRAME-POINTER #x...>: pointer to a stack frame
#<DISABLED POINTER>: frame pointer which has become invalid on exit from the corresponding BLOCK or TAGBODY
#<...STREAM...>: STREAM
#<PACKAGE name>: PACKAGE
#<HASH-TABLE #x...>: HASH-TABLE, if *PRINT-ARRAY* is NIL
#<READTABLE #x...>: READTABLE
#<SYMBOL-MACRO form>: SYMBOL-MACRO handler
#<MACRO function>: macro expander (defined by DEFMACRO and friends)