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#' @title The type of a file array (extended)
#' @param x any file array
#' @return A character string. The possible values are \code{"double"},
#' \code{"integer"}, \code{"logical"}, and \code{"raw"}
#' @export
setGeneric("typeof")
#' @rdname typeof
setMethod('typeof', signature(x = "FileArray"), function(x){
if(!x$valid()){
stop("Invalid file array")
}
x$type()
})
#' @rdname typeof
setMethod('typeof', signature(x = "FileArrayProxy"), function(x){
if(!x$valid()){
stop("Invalid file array")
}
if( length(x$.ops) ) {
final_op <- x$.ops[[length(x$.ops)]]
return( final_op$output_type )
} else {
x$type()
}
})
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