Aliases: vector-construction lgl int dbl cpl chr bytes
Keywords:
### ** Examples # These constructors are like a typed version of c(): c(TRUE, FALSE)
[1] TRUE FALSE
lgl(TRUE, FALSE)
[1] TRUE FALSE
# They follow a restricted set of coercion rules: int(TRUE, FALSE, 20)
[1] 1 0 20
# Lists can be spliced: dbl(10, !!! list(1, 2L), TRUE)
[1] 10 1 2 1
# They splice names a bit differently than c(). The latter # automatically composes inner and outer names: c(a = c(A = 10), b = c(B = 20, C = 30))
a.A b.B b.C 10 20 30
# On the other hand, rlang's constructors use the inner names and issue a # warning to inform the user that the outer names are ignored: dbl(a = c(A = 10), b = c(B = 20, C = 30))
Warning: Outer names are only allowed for unnamed scalar atomic inputs
A B C 10 20 30
dbl(a = c(1, 2))
Warning: Outer names are only allowed for unnamed scalar atomic inputs
[1] 1 2
# As an exception, it is allowed to provide an outer name when the # inner vector is an unnamed scalar atomic: dbl(a = 1)
a 1
# Spliced lists behave the same way: dbl(!!! list(a = 1))
a 1
dbl(!!! list(a = c(A = 1)))
Warning: Outer names are only allowed for unnamed scalar atomic inputs
A 1
# bytes() accepts integerish inputs bytes(1:10)
[1] 01 02 03 04 05 06 07 08 09 0a
bytes(0x01, 0xff, c(0x03, 0x05), list(10, 20, 30L))
[1] 01 ff 03 05 0a 14 1e