class type mstring_factory =The object creating newobject..end
mstring objectsmethod create_from_string : string -> int -> int -> bool -> mstringcreate_from_string s pos len must_copy: Creates the mstring from the
sub string of s starting at pos with length len
If must_copy the mstring object must create a copy. Otherwise
it can just keep the string passed in.
method create_from_memory : Netsys_mem.memory -> int -> int -> bool -> mstringcreate_from_memory m pos len must_copy: Creates the mstring from the
sub string of m starting at pos with length len
If must_copy the mstring object must create a copy. Otherwise
it can just keep the memory passed in.
