feat: Waku v2 bridge

Issue #12610

vendor/github.com/anacrolix/missinggo/v2/multiless.go

@@ -0,0 +1,59 @@
+package missinggo
+
+type (
+	// A function that returns equality, and less than. Used for lazily evaluating arguments.
+	SameLessFunc func() (same, less bool)
+	// A helper for long chains of "less-than" comparisons, where later comparisons are only
+	// required if earlier ones haven't resolved the comparison.
+	MultiLess struct {
+		ok   bool
+		less bool
+	}
+)
+
+// True iff the left is less than the right. Will return false if they're equal, or unresolved.
+// (Which is okay in certain circumstances.)
+func (me *MultiLess) Less() bool {
+	return me.ok && me.less
+}
+
+// Returns the result of the less-than comparison chains. Panics if the case was not resolved.
+func (me *MultiLess) Final() bool {
+	if !me.ok {
+		panic("undetermined")
+	}
+	return me.less
+}
+
+// Returns less-than, and whether the comparison was definitely resolved.
+func (me *MultiLess) FinalOk() (left, ok bool) {
+	return me.less, me.ok
+}
+
+// `f` is only evaluated if the result is not yet determined.
+func (me *MultiLess) Next(f SameLessFunc) {
+	if me.ok {
+		return
+	}
+	same, less := f()
+	if same {
+		return
+	}
+	me.ok = true
+	me.less = less
+}
+
+// Like Next, but the arguments are already evaluated.
+func (me *MultiLess) StrictNext(same, less bool) {
+	me.Next(func() (bool, bool) { return same, less })
+}
+
+// Compare booleans, where the lesser is the true one, if the other is false.
+func (me *MultiLess) NextBool(l, r bool) {
+	me.StrictNext(l == r, l)
+}
+
+// Next use a common comparison result, where < 0 is less and 0 is equal.
+func (me *MultiLess) Compare(i int) {
+	me.StrictNext(i == 0, i < 0)
+}