+
+bool Item::Less(const Item &lhs, const Item &rhs) {
+ if (lhs.IsMostUseful()) {
+ return !rhs.IsMostUseful();
+ }
+ if (lhs.IsEquipable()) {
+ if (rhs.IsMostUseful()) {
+ return false;
+ }
+ if (!rhs.IsEquipable()) {
+ return true;
+ }
+ return lhs.equipability < rhs.equipability;
+ }
+ if (lhs.IsFruit()) {
+ if (rhs.IsMostUseful() || rhs.IsEquipable()) {
+ return true;
+ }
+ return !rhs.IsFruit();
+ }
+ return false;
+}
+