Merge pull request #942 from longfin/feature/currency-equal

Implement .Equals for Currency
planetarium · Jul 31, 2020 · 8d81300 · 8d81300
2 parents d2a1f60 + 9cb6e3c
commit 8d81300
Show file tree

Hide file tree

Showing 2 changed files with 38 additions and 1 deletion.
diff --git a/Libplanet.Tests/CurrencyTest.cs b/Libplanet.Tests/CurrencyTest.cs
@@ -125,5 +125,19 @@ public void Serializable()
                 Assert.Equal(currency.Hash, deserialized.Hash);
             }
         }
+
+        [Fact]
+        public void Equal()
+        {
+            var currencyA = new Currency(ticker: "GOLD", minter: AddressA);
+            var currencyB = new Currency(ticker: "GOLD", minter: AddressA);
+            var currencyC = new Currency(ticker: "GOLD", minter: AddressB);
+            var currencyD = new Currency(ticker: "SILVER", minter: AddressA);
+
+            Assert.Equal(currencyA, currencyA);
+            Assert.Equal(currencyA, currencyB);
+            Assert.NotEqual(currencyA, currencyC);
+            Assert.NotEqual(currencyA, currencyD);
+        }
     }
 }
diff --git a/Libplanet/Currency.cs b/Libplanet/Currency.cs
@@ -21,7 +21,7 @@ namespace Libplanet
     /// EUR (Euro), <em>not values</em> like $100 or €100.
     /// </summary>
     [Serializable]
-    public readonly struct Currency : ISerializable
+    public readonly struct Currency : ISerializable, IEquatable<Currency>
     {
         /// <summary>
         /// The ticker symbol, e.g., <c>&quot;USD&quot;</c>.
@@ -124,6 +124,29 @@ public void GetObjectData(SerializationInfo info, StreamingContext context)
         public override string ToString() =>
             $"{Ticker} ({Hash})";
 
+        [Pure]
+        public override int GetHashCode()
+        {
+            unchecked
+            {
+                return -1545866855 + Hash.GetHashCode();
+            }
+        }
+
+        [Pure]
+        public override bool Equals(object? obj)
+        {
+            return obj is IEquatable<Currency> other
+                ? other.Equals(this)
+                : false;
+        }
+
+        [Pure]
+        public bool Equals(Currency other)
+        {
+            return Hash.Equals(other.Hash);
+        }
+
         [Pure]
         private HashDigest<SHA1> GetHash()
         {