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*traced-results*

Variable
Summary

The list of results from the function being traced.

Package

hcl

Initial value

nil

Description

Upon leaving a function that is being traced, *traced-results* is bound to the list of results from the function. *traced-results* is then printed after the function name in the output from tracing. It is accessible in the :after forms to trace. However care should be used when manipulating this variable, since it is the value of *traced-results* itself that is used when returning from the traced function. Thus if this value is altered by the :after forms then the caller of the traced function receives the altered results.

Example
USER 5 > (trace (ceiling
                   :after
                  ((setq *traced-results*
                     (mapcar #'1- *traced-results*)))))
CEILING 
USER 6 > (multiple-value-call #'+ (ceiling 4 3))
0 CEILING > (4 3) 
0 CEILING < (2 -2)  
 (1 -3) 
-2   
Notes

*traced-results* is an extension to Common Lisp.

See also

trace


LispWorks User Guide and Reference Manual - 20 Sep 2017

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