CLHS: Local Macro PPRINT-EXIT-IF-LIST-EXHAUSTED

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Local Macro PPRINT-EXIT-IF-LIST-EXHAUSTED

Syntax:

pprint-exit-if-list-exhausted <no arguments> => nil

Arguments and Values: None.

Description:

Tests whether or not the list passed to the lexically current logical block has been exhausted; see Section 22.2.1.1 (Dynamic Control of the Arrangement of Output). If this list has been reduced to nil, pprint-exit-if-list-exhausted terminates the execution of the lexically current logical block except for the printing of the suffix. Otherwise pprint-exit-if-list-exhausted returns nil.

Whether or not pprint-exit-if-list-exhausted is fbound in the global environment is implementation-dependent; however, the restrictions on redefinition and shadowing of pprint-exit-if-list-exhausted are the same as for symbols in the `COMMON-LISP` package which are fbound in the global environment. The consequences of attempting to use pprint-exit-if-list-exhausted outside of pprint-logical-block are undefined.

Examples: None.

Side Effects: None.

Affected By: None.

Exceptional Situations:

An error is signaled (at macro expansion time or at run time) if pprint-exit-if-list-exhausted is used anywhere other than lexically within a call on pprint-logical-block. Also, the consequences of executing pprint-if-list-exhausted outside of the dynamic extent of the pprint-logical-block which lexically contains it are undefined.

See Also:

pprint-logical-block, pprint-pop.

Notes: None.

The following X3J13 cleanup issues, not part of the specification, apply to this section:

- LEXICAL-CONSTRUCT-GLOBAL-DEFINITION:UNDEFINED
- PRETTY-PRINT-INTERFACE

Copyright 1996-2001, Xanalys Inc. All rights reserved.