3 files changed, 30 insertions, 0 deletions
diff --git a/lib/include/array_hash.hpp b/lib/include/array_hash.hpp
new file mode 100644
index 0000000..3b35e4a
--- /dev/null
+++ b/lib/include/array_hash.hpp
@@ -0,0 +1,27 @@
+
+#pragma once
+
+#include <array>
+#include <unordered_map>
+
+namespace std
+{
+    template<typename T, size_t N>
+    struct hash<array<T, N> >
+    {
+        typedef array<T, N> argument_type;
+        typedef size_t result_type;
+
+        result_type operator()(const argument_type& a) const
+        {
+            hash<T> hasher;
+            result_type h = 0;
+            for (result_type i = 0; i < N; ++i)
+            {
+                h = h * 31 + hasher(a[i]);
+            }
+            return h;
+        }
+    };
+}
+
diff --git a/lib/include/graph.hpp b/lib/include/graph.hpp
index c1ad4f0..ea08214 100644
--- a/lib/include/graph.hpp
+++ b/lib/include/graph.hpp
@@ -9,6 +9,7 @@
 #include <list>
 #include <exception>
 
+#include "array_hash.hpp"
 
 class graph {
   public:
@@ -25,6 +26,7 @@ class graph {
     typedef struct edge {
       std::array<unsigned int, 2> v;
       coordinate r;
+      std::array<bool, 2> crossings;
     } edge;
 
     coordinate L;
diff --git a/lib/include/network.hpp b/lib/include/network.hpp
index d955e43..70173e6 100644
--- a/lib/include/network.hpp
+++ b/lib/include/network.hpp
@@ -12,6 +12,7 @@
 #include "graph.hpp"
 #include "hooks.hpp"
 #include "current_info.hpp"
+#include "array_hash.hpp"
 
 #ifdef FRACTURE_LONGINT