val compare : t -> t -> int
A total ordering function over the keys. This is a two-argument function
f
such thatf e1 e2
is zero if the keyse1
ande2
are equal,f e1 e2
is strictly negative ife1
is smaller thane2
, andf e1 e2
is strictly positive ife1
is greater thane2
. Example: a suitable ordering function is the generic structural comparison functionStdlib.compare
.