As the round function in R follows the same standard (IEC 60559) of rounding to even, you can just first round, and then use R's as.integer function. A function for that would look like this 
CInt <- function (x) {
as.integer(round(x))
}
CInt(0.5)
#> [1] 0
CInt(1.5)
#> [1] 2
class(CInt(0.5))
#> [1] "integer"
Created on 2020-07-31 by the reprex package (v0.3.0)