Avoid CWalletTx copies in GetAddressBalances and GetAddressGroupings

src/wallet/wallet.cpp

@@ -3261,9 +3261,9 @@ std::map<CTxDestination, CAmount> CWallet::GetAddressBalances()
 
     {
         LOCK(cs_wallet);
-        BOOST_FOREACH(PAIRTYPE(uint256, CWalletTx) walletEntry, mapWallet)
+        for (const auto& walletEntry : mapWallet)
         {
-            CWalletTx *pcoin = &walletEntry.second;
+            const CWalletTx *pcoin = &walletEntry.second;
 
             if (!pcoin->IsTrusted())
                 continue;
@@ -3301,9 +3301,9 @@ std::set< std::set<CTxDestination> > CWallet::GetAddressGroupings()
     std::set< std::set<CTxDestination> > groupings;
     std::set<CTxDestination> grouping;
 
-    BOOST_FOREACH(PAIRTYPE(uint256, CWalletTx) walletEntry, mapWallet)
+    for (const auto& walletEntry : mapWallet)
     {
-        CWalletTx *pcoin = &walletEntry.second;
+        const CWalletTx *pcoin = &walletEntry.second;
 
         if (pcoin->tx->vin.size() > 0)
         {