diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 52 |
1 files changed, 52 insertions, 0 deletions
@@ -21384,6 +21384,58 @@ of a range. Note that these functions are not accessors, which is because ranges are immutable. +.coNP Functions @ in-range and @ in-range* +.synb +.mets (in-range < range << value ) +.mets (in-range* < range << value ) +.syne +.desc +The +.code in-range +and +.code in-range* +functions test whether the +.meta value +argument lies in the range represented by the +.meta range +argument, indicating the Boolean result using one of the values +.code t +or +.codn nil . + +The +.meta range +argument must be a range object. + +It is expected that the range object's +.code from +value does not exceed the +.code to +value; a reversed range is considered empty. + +The +.code in-range* +function differs from +.code in-range +in that it excludes the +upper endpoint. + +The implicit comparison against the range endpoints is performed +using the +.code less +and +.code lequal +functions, as appropriate. + +The following equivalences hold: + +.cblk + (in-range r x) <--> (and (lequal (from r) x) + (lequal (to r) x)) + + (in-range* r x) <--> (and (lequal (from r) x) + (less (to r) x)) +.cble .SS* Characters and Strings .coNP Function @ mkstring .synb |