diff options
| -rw-r--r-- | txr.1 | 40 |
1 files changed, 30 insertions, 10 deletions
@@ -18525,6 +18525,8 @@ brackets indicate a plurality of types which are not listed by name: | | | +--- tree-iter | | + | +--- seq-iter + | | | +--- cptr | | | +--- dir @@ -34539,14 +34541,12 @@ method. Details are specified in the section .desc The .code iter-begin -function returns an iterator object specialized for the task of traversing the -.meta seq -object. The +function returns an iterator object suitable for traversing the +elements of the sequence denoted by the .meta seq -argument may be any sequence. Additionally, it may be a character, number or -a numeric or character range. +object. -Note: if +If .meta seq is a list-like sequence, then .code iter-begin @@ -34556,6 +34556,28 @@ itself as the iterator. Likewise if .meta seq is a number. +If +.meta seq +is a structure which supports the +.code iter-begin +method, then that method is called and its return value is returned. +A structure which does not support this method is possibly considered +to be a sequence according to the usual criteria, based on whether +it supports the +.codn nullify , +.code length +or +.code car +methods. An struct object supporting none of these methods is deemed +not iterable. + +In all other cases, if +.meta seq +is iterable, an object of type +.code seq-iter +is returned. + +Range objects are iterable. A range is considered to be a numeric or character range if the .code from element is a number or character. The @@ -34576,10 +34598,8 @@ are equivalent to .codn "(iter-begin X)" . If -.meta seq -is a structure which supports the -.code iter-begin -method, then that method is called and its return value is returned. +.code seq +is not an iterable object, an error exception is thrown. .coNP Function @ iter-more .synb |