1 files changed, 34 insertions, 0 deletions
diff --git a/src/core.h b/src/core.h
index ce21acd59e..9ee8b2edce 100644
--- a/src/core.h
+++ b/src/core.h
@@ -661,4 +661,38 @@ public:
     void print() const;
 };
 
+
+/** Describes a place in the block chain to another node such that if the
+ * other node doesn't have the same branch, it can find a recent common trunk.
+ * The further back it is, the further before the fork it may be.
+ */
+struct CBlockLocator
+{
+    std::vector<uint256> vHave;
+
+    CBlockLocator() {}
+
+    CBlockLocator(const std::vector<uint256>& vHaveIn)
+    {
+        vHave = vHaveIn;
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        if (!(nType & SER_GETHASH))
+            READWRITE(nVersion);
+        READWRITE(vHave);
+    )
+
+    void SetNull()
+    {
+        vHave.clear();
+    }
+
+    bool IsNull()
+    {
+        return vHave.empty();
+    }
+};
+
 #endif