Implement operator< for KeyOriginInfo and CExtPubKey

Author: achow101

src/pubkey.h

@@ -130,6 +130,11 @@ class CPubKey
         return a.vch[0] < b.vch[0] ||
                (a.vch[0] == b.vch[0] && memcmp(a.vch, b.vch, a.size()) < 0);
     }
+    friend bool operator>(const CPubKey& a, const CPubKey& b)
+    {
+        return a.vch[0] > b.vch[0] ||
+               (a.vch[0] == b.vch[0] && memcmp(a.vch, b.vch, a.size()) > 0);
+    }
 
     //! Implement serialization, as if this was a byte vector.
     template <typename Stream>
@@ -305,6 +310,16 @@ struct CExtPubKey {
         return !(a == b);
     }
 
+    friend bool operator<(const CExtPubKey &a, const CExtPubKey &b)
+    {
+        if (a.pubkey < b.pubkey) {
+            return true;
+        } else if (a.pubkey > b.pubkey) {
+            return false;
+        }
+        return a.chaincode < b.chaincode;
+    }
+
     void Encode(unsigned char code[BIP32_EXTKEY_SIZE]) const;
     void Decode(const unsigned char code[BIP32_EXTKEY_SIZE]);
     void EncodeWithVersion(unsigned char code[BIP32_EXTKEY_WITH_VERSION_SIZE]) const;

src/script/keyorigin.h

@@ -18,6 +18,25 @@ struct KeyOriginInfo
         return std::equal(std::begin(a.fingerprint), std::end(a.fingerprint), std::begin(b.fingerprint)) && a.path == b.path;
     }
 
+    friend bool operator<(const KeyOriginInfo& a, const KeyOriginInfo& b)
+    {
+        // Compare the fingerprints lexicographically
+        int fpr_cmp = memcmp(a.fingerprint, b.fingerprint, 4);
+        if (fpr_cmp < 0) {
+            return true;
+        } else if (fpr_cmp > 0) {
+            return false;
+        }
+        // Compare the sizes of the paths, shorter is "less than"
+        if (a.path.size() < b.path.size()) {
+            return true;
+        } else if (a.path.size() > b.path.size()) {
+            return false;
+        }
+        // Paths same length, compare them lexicographically
+        return a.path < b.path;
+    }
+
     SERIALIZE_METHODS(KeyOriginInfo, obj) { READWRITE(obj.fingerprint, obj.path); }
 
     void clear()