Implementation for df-other-vectors-type in C++. Still needs Lua and Ruby support.

library/include/BitArray.h

@@ -568,4 +568,14 @@ namespace DFHack
             root->next = link;
         }
     };
+
+    template<typename T, typename O, typename I>
+    struct DfOtherVectors
+    {
+        std::vector<I *> & operator[](O other_id)
+        {
+            auto vectors = reinterpret_cast<std::vector<I *> *>(this);
+            return vectors[other_id];
+        }
+    };
 }

library/include/DataDefs.h

@@ -474,6 +474,7 @@ namespace df
     using DFHack::BitArray;
     using DFHack::DfArray;
     using DFHack::DfLinkedList;
+    using DFHack::DfOtherVectors;
 
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdelete-non-virtual-dtor"