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cl:variables:repl-star [2017/05/01 21:00] (current) |
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| + | ====== Variable *, **, *** ====== | ||
| + | |||
| + | ====Value Type==== | ||
| + | an //[[CL:Glossary:object]]//. | ||
| + | |||
| + | ====Initial Value==== | ||
| + | //[[CL:Glossary:implementation-dependent]]//. | ||
| + | |||
| + | ====Description==== | ||
| + | The //[[CL:Glossary:variable|variables]]// **<nowiki>*</nowiki>**, **<nowiki>**</nowiki>**, and **<nowiki>***</nowiki>** are maintained by the //[[CL:Glossary:Lisp read-eval-print loop]]// to save the values of results that are printed each time through the loop. | ||
| + | |||
| + | The //[[CL:Glossary:value]]// of **<nowiki>*</nowiki>** is the most recent //[[CL:Glossary:primary value]]// that was printed, the //[[CL:Glossary:value]]// of **<nowiki>**</nowiki>** is the previous value of **[[CL:Types:wildcard|*]]**, and the //[[CL:Glossary:value]]// of **<nowiki>***</nowiki>** is the previous value of **<nowiki>**</nowiki>**. | ||
| + | |||
| + | If several values are produced, **[[CL:Types:wildcard|*]]** contains the first value only; **[[CL:Types:wildcard|*]]** contains **[[CL:Constant Variables:nil]]** if zero values are produced. | ||
| + | |||
| + | The //[[CL:Glossary:value|values]]// of **[[CL:Types:wildcard|*]]**, **<nowiki>**</nowiki>**, and **<nowiki>***</nowiki>** are updated immediately prior to printing the //[[CL:Glossary:return value]]// of a top-level //[[CL:Glossary:form]]// by the //[[CL:Glossary:Lisp read-eval-print loop]]//. If the //[[CL:Glossary:evaluation]]// of such a //[[CL:Glossary:form]]// is aborted prior to its normal return, the values of **[[CL:Types:wildcard|*]]**, **<nowiki>**</nowiki>**, and **<nowiki>***</nowiki>** are not updated. | ||
| + | |||
| + | ====Examples==== | ||
| + | <blockquote> | ||
| + | ([[CL:Functions:values]] 'a1 'a2) <r>A1 | ||
| + | A2</r> | ||
| + | 'b <r>B</r> | ||
| + | ([[CL:Functions:values]] 'c1 'c2 'c3) <r>C1 | ||
| + | C2 | ||
| + | C3</r> | ||
| + | ([[CL:Functions:list]] * ** ***) <r>(C1 B A1)</r> | ||
| + | |||
| + | ([[CL:Macros:defun]] cube-root (x) ([[CL:Functions:expt]] x 1/3)) <r>CUBE-ROOT</r> | ||
| + | ([[CL:Macros:defparameter]] *a* (cube-root 27.0)) <r>*A*</r> | ||
| + | *a* <r>3.0</r> | ||
| + | ([[CL:Functions:math-multiply|*]] * 9.0) <r>27.0</r> | ||
| + | </blockquote> | ||
| + | |||
| + | ====Affected By==== | ||
| + | //[[CL:Glossary:Lisp read-eval-print loop]]//. | ||
| + | |||
| + | ====See Also==== | ||
| + | **[[CL:Variables:repl-minus|Variable -]]**, **[[CL:Variables:repl-plus|Variable +]]**, **[[CL:Variables:repl-slash|Variable /]]**, {\secref\TopLevelLoop} | ||
| + | |||
| + | ====Notes==== | ||
| + | |||
| + | <blockquote> | ||
| + | * ≡ (car [[CL:Variables:repl-slash|/]]) | ||
| + | ** ≡ (car [[CL:Variables:repl-slash-slash|//]]) | ||
| + | *** ≡ (car [[CL:Variables:repl-slash-slash-slash|///]]) | ||
| + | </blockquote> | ||
| + | |||
