func (r SortedIntToStringMap) IsEmpty() bool {
	return r.root == nil
}
IsEmpty tells if the sorted map contains no key/value.
package codegen
func (r SortedIntToStringMap) compare(a, b int) int { return int(a) - int(b) }
type SortedIntToStringMap struct {
	root *nodeIntToString
}
func NewSortedIntToStringMap() *SortedIntToStringMap { return &SortedIntToStringMap{} }