A Memmap object represents an entire mapped file and is sliced to
create objects which can be used as array buffers. It has these
close unites the Memmap and any RAM based slices with
its underlying file and removes the mapping and all references to
its slices. Once a Memmap has been closed, all of its
slices become unusable.
find(string, offset=0) returns the first index at which string
is found, or -1 on failure.
>>> _open("memmap.tst","w+").write("this is a test")
>>> Memmap("memmap.tst",len=14).find("is", 3)
offset, size=None, buffer=None)
insert places a new slice at the specified offset of
the Memmap. size indicates the length in bytes of the
inserted slice when buffer is not specified. If buffer
is specified, it should refer to an existing memory object created
using numarray.memory.new_memory and size should not
flush writes a Memmap out to its associated file,
reconciling any inserted or resized slices by backing them directly
on the map file rather than a system swap file. flush
only makes sense for write and readwrite memory maps.
sync forces slices which are backed on the map file to be
immediately written to disk. Resized or newly inserted slices are
not affected. sync only makes sense for write and
readwrite memory maps.