df structure support

library/include/df/custom/.gitignore

@@ -0,0 +1 @@
+!*.h

library/include/df/custom/hash/labor_kitchen_interface_food_key.h

@@ -0,0 +1,16 @@
+template<>
+struct std::hash<labor_kitchen_interface_food_key> {
+    auto operator()(const labor_kitchen_interface_food_key &a) const -> size_t {
+        struct thing {
+            int16_t t;
+            int16_t st;
+            int32_t x;
+        } thing{
+            .t = a.type;
+            .st = a.subtype,
+            .x = static_cast<int32_t>(a.mat) ^ (static_cast<int32_t>(a.matg))
+        };
+
+        return hash<int64_t>()(bit_cast<int64_t>(thing));
+        }
+    };

library/include/df/custom/labor_kitchen_interface_food_key.custom.inc

@@ -0,0 +1,11 @@
+    bool operator<(const labor_kitchen_interface_food_key &b) const {
+        if (type<b.type) return true;
+        if (subtype<b.subtype) return true;
+        if (mat<b.mat) return true;
+        if (matg<b.matg) return true;
+        return false;
+        }
+
+    bool operator==(const labor_kitchen_interface_food_key &b) const {
+        return type==b.type&&subtype==b.subtype&&mat==b.mat&&matg==b.matg;
+        }