Use range-based for loops (C++11) when looping over vector elements

Author: practicalswift

src/net_processing.cpp

@@ -754,8 +754,8 @@ void PeerLogicValidation::BlockConnected(const std::shared_ptr<const CBlock>& pb
         const CTransaction& tx = *ptx;
 
         // Which orphan pool entries must we evict?
-        for (size_t j = 0; j < tx.vin.size(); j++) {
-            auto itByPrev = mapOrphanTransactionsByPrev.find(tx.vin[j].prevout);
+        for (const auto& txin : tx.vin) {
+            auto itByPrev = mapOrphanTransactionsByPrev.find(txin.prevout);
             if (itByPrev == mapOrphanTransactionsByPrev.end()) continue;
             for (auto mi = itByPrev->second.begin(); mi != itByPrev->second.end(); ++mi) {
                 const CTransaction& orphanTx = *(*mi)->second.tx;
@@ -1553,10 +1553,8 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
 
         uint32_t nFetchFlags = GetFetchFlags(pfrom);
 
-        for (unsigned int nInv = 0; nInv < vInv.size(); nInv++)
+        for (CInv &inv : vInv)
         {
-            CInv &inv = vInv[nInv];
-
             if (interruptMsgProc)
                 return true;
 

src/policy/fees.cpp

@@ -604,8 +604,8 @@ void CBlockPolicyEstimator::processBlock(unsigned int nBlockHeight,
 
     unsigned int countedTxs = 0;
     // Update averages with data points from current block
-    for (unsigned int i = 0; i < entries.size(); i++) {
-        if (processBlockTx(nBlockHeight, entries[i]))
+    for (const auto& entry : entries) {
+        if (processBlockTx(nBlockHeight, entry))
             countedTxs++;
     }
 

src/script/interpreter.cpp

@@ -1142,24 +1142,24 @@ class CTransactionSignatureSerializer {
 
 uint256 GetPrevoutHash(const CTransaction& txTo) {
     CHashWriter ss(SER_GETHASH, 0);
-    for (unsigned int n = 0; n < txTo.vin.size(); n++) {
-        ss << txTo.vin[n].prevout;
+    for (const auto& txin : txTo.vin) {
+        ss << txin.prevout;
     }
     return ss.GetHash();
 }
 
 uint256 GetSequenceHash(const CTransaction& txTo) {
     CHashWriter ss(SER_GETHASH, 0);
-    for (unsigned int n = 0; n < txTo.vin.size(); n++) {
-        ss << txTo.vin[n].nSequence;
+    for (const auto& txin : txTo.vin) {
+        ss << txin.nSequence;
     }
     return ss.GetHash();
 }
 
 uint256 GetOutputsHash(const CTransaction& txTo) {
     CHashWriter ss(SER_GETHASH, 0);
-    for (unsigned int n = 0; n < txTo.vout.size(); n++) {
-        ss << txTo.vout[n];
+    for (const auto& txout : txTo.vout) {
+        ss << txout;
     }
     return ss.GetHash();
 }

src/validation.cpp

@@ -309,7 +309,6 @@ bool CheckSequenceLocks(const CTransaction &tx, int flags, LockPoints* lp, bool
     return EvaluateSequenceLocks(index, lockPair);
 }
 
-
 void LimitMempoolSize(CTxMemPool& pool, size_t limit, unsigned long age) {
     int expired = pool.Expire(GetTime() - age);
     if (expired != 0) {
@@ -2817,8 +2816,8 @@ bool ContextualCheckBlock(const CBlock& block, CValidationState& state, const Co
 
     // No witness data is allowed in blocks that don't commit to witness data, as this would otherwise leave room for spam
     if (!fHaveWitness) {
-        for (size_t i = 0; i < block.vtx.size(); i++) {
-            if (block.vtx[i]->HasWitness()) {
+      for (const auto& tx : block.vtx) {
+            if (tx->HasWitness()) {
                 return state.DoS(100, false, REJECT_INVALID, "unexpected-witness", true, strprintf("%s : unexpected witness data found", __func__));
             }
         }

src/wallet/wallet.cpp

@@ -1781,8 +1781,8 @@ bool CWalletTx::IsEquivalentTo(const CWalletTx& _tx) const
 {
         CMutableTransaction tx1 = *this->tx;
         CMutableTransaction tx2 = *_tx.tx;
-        for (unsigned int i = 0; i < tx1.vin.size(); i++) tx1.vin[i].scriptSig = CScript();
-        for (unsigned int i = 0; i < tx2.vin.size(); i++) tx2.vin[i].scriptSig = CScript();
+        for (auto& txin : tx1.vin) txin.scriptSig = CScript();
+        for (auto& txin : tx2.vin) txin.scriptSig = CScript();
         return CTransaction(tx1) == CTransaction(tx2);
 }
 
@@ -2183,10 +2183,10 @@ bool CWallet::SelectCoinsMinConf(const CAmount& nTargetValue, const int nConfMin
 
     if (nTotalLower == nTargetValue)
     {
-        for (unsigned int i = 0; i < vValue.size(); ++i)
+        for (const auto& input : vValue)
         {
-            setCoinsRet.insert(vValue[i]);
-            nValueRet += vValue[i].txout.nValue;
+            setCoinsRet.insert(input);
+            nValueRet += input.txout.nValue;
         }
         return true;
     }
@@ -2316,7 +2316,7 @@ bool CWallet::SignTransaction(CMutableTransaction &tx)
     // sign the new tx
     CTransaction txNewConst(tx);
     int nIn = 0;
-    for (auto& input : tx.vin) {
+    for (const auto& input : tx.vin) {
         std::map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(input.prevout.hash);
         if(mi == mapWallet.end() || input.prevout.n >= mi->second.tx->vout.size()) {
             return false;
@@ -3258,11 +3258,11 @@ std::set< std::set<CTxDestination> > CWallet::GetAddressGroupings()
         }
 
         // group lone addrs by themselves
-        for (unsigned int i = 0; i < pcoin->tx->vout.size(); i++)
-            if (IsMine(pcoin->tx->vout[i]))
+        for (const auto& txout : pcoin->tx->vout)
+            if (IsMine(txout))
             {
                 CTxDestination address;
-                if(!ExtractDestination(pcoin->tx->vout[i].scriptPubKey, address))
+                if(!ExtractDestination(txout.scriptPubKey, address))
                     continue;
                 grouping.insert(address);
                 groupings.insert(grouping);