feat: token transfer operator == adition

Signed-off-by: Egbaiyelo <moteniolaegbaiyelo@trentu.ca>

Author: Egbaiyelo

src/sdk/main/include/TokenTransfer.h

@@ -97,6 +97,14 @@ class TokenTransfer
    */
   void validateChecksums(const Client& client) const;
 
+  /**
+   * Compare this TokenTransfer instance to another TokenTransfer instance and determine if they represent the same pending TokenTransfer.
+   *
+   * @param other The other TokenTransfer with which to compare this TokenTransfer.
+   * @return \c TRUE if this TokenTransfer is the same as the input TokenTransfer, otherwise \c FALSE.
+   */
+  friend bool operator==(const TokenTransfer&, const TokenTransfer&);
+
   /**
    * Construct an AccountAmount protobuf object from this TokenTransfer object.
    *
@@ -158,6 +166,15 @@ class TokenTransfer
   FungibleHookCall mHookCall;
 };
 
+// Adding nodiscard attribute to == operator 
+/**
+ * Compare this TokenTransfer instance to another TokenTransfer instance and determine if they represent the same pending TokenTransfer.
+ *
+ * @param other The other TokenTransfer with which to compare this TokenTransfer.
+ * @return \c TRUE if this TokenTransfer is the same as the input TokenTransfer, otherwise \c FALSE.
+ */
+[[nodiscard]] bool operator==(const TokenTransfer&, const TokenTransfer&);
+
 } // namespace Hiero
 
 #endif // HIERO_SDK_CPP_TOKEN_TRANSFER_H_

src/sdk/main/src/TokenTransfer.cc

@@ -78,6 +78,10 @@ void TokenTransfer::validateChecksums(const Client& client) const
   mAccountId.validateChecksum(client);
 }
 
+bool operator==(const TokenTransfer& lhs, const TokenTransfer& rhs) {
+  return (lhs.mTokenId == rhs.mTokenId) && (lhs.mAccountId == rhs.mAccountId) && (lhs.mAmount == rhs.mAmount) && (lhs.mIsApproval == rhs.mIsApproval) && (lhs.mExpectedDecimals == rhs.mExpectedDecimals);
+} 
+
 //-----
 std::unique_ptr<proto::AccountAmount> TokenTransfer::toProtobuf() const
 {

src/sdk/tests/unit/TokenTransferUnitTests.cc

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: Apache-2.0
+  // SPDX-License-Identifier: Apache-2.0
 #include "TokenTransfer.h"
 
 #include "AccountId.h"
@@ -114,3 +114,27 @@ TEST_F(TokenTransferUnitTests, ToProtobuf)
   EXPECT_EQ(proto->amount(), getTestAmount());
   EXPECT_EQ(proto->is_approval(), getTestIsApproval());
 }
+
+//-----
+TEST_F(TokenTransferUnitTests, OperatorEqualsFt)
+{
+  // Given
+  // Defaults
+  TokenTransfer defaultTokenL;
+  TokenTransfer defaultTokenR;
+  // Identical
+  TokenTransfer equalTokenL(
+    getTestTokenId(), getTestAccountId(), getTestAmount(), getTestExpectedDecimals(), getTestIsApproval());
+  TokenTransfer equalTokenR(
+    getTestTokenId(), getTestAccountId(), getTestAmount(), getTestExpectedDecimals(), getTestIsApproval());
+  // Different
+  TokenTransfer diffTokenL(
+    getTestTokenId(), getTestAccountId(), getTestAmount(), getTestExpectedDecimals(), true);
+  TokenTransfer diffTokenR(
+    getTestTokenId(), getTestAccountId(), getTestAmount(), getTestExpectedDecimals(), false);
+
+  // Then
+  EXPECT_TRUE(defaultTokenL == defaultTokenR);
+  EXPECT_TRUE(equalTokenL == equalTokenR);
+  EXPECT_TRUE(diffTokenL == diffTokenR);
+}