ToC DocOverview CGDoc RelNotes Index PermutedIndex
Allegro CL
Home Previous Up Next Table of Contents Index
  ANSI Common Lisp   9 Conditions   9.1 Condition System Concepts

9.1.3 Printing Conditions

If the :report argument to define-condition is used, a print function is defined that is called whenever the defined condition is printed while the value of *print-escape* is false. This function is called the condition reporter; the text which it outputs is called a report message.

When a condition is printed and *print-escape* is false, the condition reporter for the condition is invoked. Conditions are printed automatically by functions such as invoke-debugger, break, and warn.

When *print-escape* is true, the object should print in an abbreviated fashion according to the style of the implementation (e.g., by print-unreadable-object). It is not required that a condition can be recreated by reading its printed representation.

No function is provided for directly accessing or invoking condition reporters.

9.1.3.1  Recommended Style in Condition Reporting


Home Previous Up Next Table of Contents Index
© Franz Inc. 1998-2019 - File last updated 02-07-2019