# print method gives human friendly output
Code
list_of(1, 2:3)
Output
<list_of<double>[2]>
[[1]]
[1] 1
[[2]]
[1] 2 3
---
Code
tibble::tibble(x = list_of(1, 2:3))
Output
# A tibble: 2 x 1
x
<list<dbl>>
1 [1]
2 [2]
# str method is reasonably correct
Code
str(x)
Output
list<dbl> [1:2]
$ : num 1
$ : num [1:2] 2 3
@ ptype: num(0)
---
Code
str(list(list(x, y = 2:1)))
Output
List of 1
$ :List of 2
..$ : list<dbl> [1:2]
.. ..$ : num 1
.. ..$ : num [1:2] 2 3
.. ..@ ptype: num(0)
..$ y: int [1:2] 2 1
---
Code
str(x[0])
Output
list<dbl> [1:0]
list()
@ ptype: num(0)
---
Code
str(list(list(x[0], y = 2:1)))
Output
List of 1
$ :List of 2
..$ : list<dbl> [1:0]
list()
.. ..@ ptype: num(0)
..$ y: int [1:2] 2 1
# list coercions are symmetric and unchanging
Code
print(mat)
Output
list list_of<integer> list_of<double> list_of<character>
list "list" "list" "list" "list"
list_of<integer> "list" "list_of<integer>" "list_of<double>" "list"
list_of<double> "list" "list_of<double>" "list_of<double>" "list"
list_of<character> "list" "list" "list" "list_of<character>"
# error call is passed to inner cast methods
Code
(expect_error(fn1()))
Output
<error/vctrs_error_cast>
Error in `fn1()`:
! Can't convert `..1` <double> to <character>.
Code
(expect_error(fn2()))
Output
<error/vctrs_error_cast>
Error in `fn2()`:
! Can't convert `..1` <double> to <character>.
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