Allocate vectors in .C64() — vector

vector_dc and its shortcuts numeric_dc and integer_dc are helper functions used in calls to .C64. They return an R object of class c("vector_dc", "list"), which contains information on the type and length of the vector to allocate. Using vector_dc together with INTENT = "w" argument of .C64 leads to performance gains by avoiding unnecessary castings and copies.

vector_dc(mode = "logical", length = 0L)

numeric_dc(length = 0)

integer_dc(length = 0)

Arguments

mode: character vector of length 1. Storage mode of the vector.
length: numeric vector of length 1. Length of the vector.

Value

object of class vector_dc and list.

Examples

vector_dc("integer", 20)
#> $mode
#> [1] "integer"
#> 
#> $length
#> [1] 20
#> 
#> attr(,"class")
#> [1] "vector_dc" "list"