cl-utilities manual

Everybody writes some utilities because they're not part of the standard but they're so broadly useful. This results in a lot of wheel reinvention, and most reinventions are not as good as they should be. The cl-utilities project is an actively maintained collection of some of these utilities, with high-quality public-domain implementations and decent documentation.

Table of contents:

• SPLIT-SEQUENCE, SPLIT-SEQUENCE-IF, SPLIT-SEQUENCE-IF-NOT. Used for splitting sequences.
• EXTREMUM, EXTREMA, N-MOST-EXTREME: Finding extreme values in sequences based on user-defined criteria.
• READ-DELIMITED reads from a sequence delimited somehow, in a somewhat inconvenient but hopefully efficient way.
• EXPT-MOD, an interface for calculating (mod (expt n e) m) efficiently across implementations.
• WITH-UNIQUE-NAMES, née WITH-GENSYMS. A classic macro-writing macro for preventing variable capture.
• COLLECTING, WITH-COLLECTORS. Some macros for clearly and efficiently collecting items into lists.
• ONCE-ONLY, a classic macro-writing macro for preventing multiple evaluation.
• ROTATE-BYTE rotates bits in a byte
• COPY-ARRAY shallow copies arrays.
• COMPOSE. Composes functions.