Nothing
Ops.mmap <- function(e1,e2) {
OPS <- switch(.Generic,"=="=1L,
"!="=2L,
">="=3L,
"<="=4L,
">"= 5L,
"<"= 6L,
-1L)
if(OPS == -1L)
stop(paste(.Generic,"unsupported for 'mmap' objects"))
if(is.mmap(e1)) {
if(storage.mode(e1$storage.mode) == "character")
e2 <- charToRaw(e2)
.Call("mmap_compare", e2, OPS, e1)
} else if(is.mmap(e2)) {
if(storage.mode(e2$storage.mode) == "character")
e1 <- charToRaw(e1)
.Call("mmap_compare", e1, OPS, e2)
}
}
dim.mmap <- function(x) {
if( is.struct(x$storage.mode))
return( c(length(x), length(x$storage.mode)) )
if(is.null(x$dim))
c(length(x),1)
else
x$dim
}
`dim<-.mmap` <- function(x, value) {
if( is.struct(x$storage.mode))
stop("dimensions are fixed for struct objects")
if( is.null(value)) {
x$dim <- value
} else
if( length(value) != 2) {
stop("only dimension of length two supported")
} else x$dim <- as.integer(value)
x
}
dimnames.mmap <- function(x) {
if( is.struct(x$storage.mode))
list(NULL, names(x$storage.mode))
else x$dimnames
}
`dimnames<-.mmap` <- function(x, value) {
if( is.null(dim(x)))
stop("'dimnames' applied to non-array")
if( is.struct(x$storage.mode)) {
names(x$storage.mode) <- value[[2]]
x$dimnames <- value
} else x$dimnames <- value
x
}
is.array.mmap <- function(x) TRUE # used for NROW/NCOL
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