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string

Type
Summary

The string type.

Package

common-lisp

Signature

string length element-type

Arguments

length

The length of the string (or * , meaning any).

element-type

The type of string element. The default is the value of lw:*default-character-element-type* rather than * .

Description

The union of all string types as specified in the standard, but extended with an extra parameter: element-type .

(string length element-type ) means all string types whose element type is a subtype of element-type . That is:

(string * base-char) = (vector base-char *)
(string * lw:simple-char) = (or (vector base-char *)
                                (vector lw:simple-char *))
(string * character)      = (or (vector base-char *)
                                (vector lw:simple-char *)
                                (vector character *)) 
Example
CL-USER 235 > (lw:set-default-character-element-type
                     'base-char)
BASE-CHAR
CL-USER 236 > (concatenate 'string "f" "o" "o")
"foo"
CL-USER 237 > (type-of *)
SIMPLE-BASE-STRING
See also
*default-character-element-type*
set-default-character-element-type

LispWorks Reference Manual - 13 Jun 2003

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