- version-pred! VER #!optional AMT IDX SEARCH?procedure
Return VER with the target element at, or before with SEARCH?, IDX replaced by the AMT predecessor.
- VER
- semantic-version ; version to adjust.
- AMT
- fixnum ; amount to adjust, default is 1.
- IDX
- fixnum ; which element to adjust, default is (sub1 (version-depth VER)).
- SEARCH?
- boolean ; search backwards for a successful operation from IDX, default is #f.
Only integer elements may be targets. See Notes.
Underflow of a zero predecessor is an error. Overflow of a most-positive-fixnum successor is an error.