Merge bitcoin/bitcoin#23054: Use C++11 member initializer in CTxMemPoolEntry

fa08d4c Use C++11 member initializer in CTxMemPoolEntry (MarcoFalke)

Pull request description:

  This removes a bunch of boilerplate, makes the code easier to read.
  Also, C++11 member initialization avoids accidental uninitialized
  members.

  Can be reviewed with the git option "--word-diff-regex=." or with "git
  difftool --tool=meld".

ACKs for top commit:
  jnewbery:
    Code review ACK fa08d4c
  shaavan:
    Code Review ACK fa08d4c

Tree-SHA512: 2424861002fbcef2a3f01845662c115b973a7a5103f359305b5d9237c055eb003aa7646fc1cb30e6eaf90810d662f94cedc6f90795e30b56680f9c81f631d64b

Author: fanquake

src/txmempool.cpp

@@ -21,23 +21,23 @@
 #include <cmath>
 #include <optional>
 
-CTxMemPoolEntry::CTxMemPoolEntry(const CTransactionRef& _tx, const CAmount& _nFee,
-                                 int64_t _nTime, unsigned int _entryHeight,
-                                 bool _spendsCoinbase, int64_t _sigOpsCost, LockPoints lp)
-    : tx(_tx), nFee(_nFee), nTxWeight(GetTransactionWeight(*tx)), nUsageSize(RecursiveDynamicUsage(tx)), nTime(_nTime), entryHeight(_entryHeight),
-    spendsCoinbase(_spendsCoinbase), sigOpCost(_sigOpsCost), lockPoints(lp)
-{
-    nCountWithDescendants = 1;
-    nSizeWithDescendants = GetTxSize();
-    nModFeesWithDescendants = nFee;
-
-    feeDelta = 0;
-
-    nCountWithAncestors = 1;
-    nSizeWithAncestors = GetTxSize();
-    nModFeesWithAncestors = nFee;
-    nSigOpCostWithAncestors = sigOpCost;
-}
+CTxMemPoolEntry::CTxMemPoolEntry(const CTransactionRef& tx, CAmount fee,
+                                 int64_t time, unsigned int entry_height,
+                                 bool spends_coinbase, int64_t sigops_cost, LockPoints lp)
+    : tx{tx},
+      nFee{fee},
+      nTxWeight(GetTransactionWeight(*tx)),
+      nUsageSize{RecursiveDynamicUsage(tx)},
+      nTime{time},
+      entryHeight{entry_height},
+      spendsCoinbase{spends_coinbase},
+      sigOpCost{sigops_cost},
+      lockPoints{lp},
+      nSizeWithDescendants{GetTxSize()},
+      nModFeesWithDescendants{nFee},
+      nSizeWithAncestors{GetTxSize()},
+      nModFeesWithAncestors{nFee},
+      nSigOpCostWithAncestors{sigOpCost} {}
 
 void CTxMemPoolEntry::UpdateFeeDelta(int64_t newFeeDelta)
 {

src/txmempool.h

@@ -37,19 +37,16 @@ extern RecursiveMutex cs_main;
 /** Fake height value used in Coin to signify they are only in the memory pool (since 0.8) */
 static const uint32_t MEMPOOL_HEIGHT = 0x7FFFFFFF;
 
-struct LockPoints
-{
+struct LockPoints {
     // Will be set to the blockchain height and median time past
     // values that would be necessary to satisfy all relative locktime
     // constraints (BIP68) of this tx given our view of block chain history
-    int height;
-    int64_t time;
+    int height{0};
+    int64_t time{0};
     // As long as the current chain descends from the highest height block
     // containing one of the inputs used in the calculation, then the cached
     // values are still valid even after a reorg.
-    CBlockIndex* maxInputBlock;
-
-    LockPoints() : height(0), time(0), maxInputBlock(nullptr) { }
+    CBlockIndex* maxInputBlock{nullptr};
 };
 
 struct CompareIteratorByHash {
@@ -98,27 +95,27 @@ class CTxMemPoolEntry
     const unsigned int entryHeight; //!< Chain height when entering the mempool
     const bool spendsCoinbase;      //!< keep track of transactions that spend a coinbase
     const int64_t sigOpCost;        //!< Total sigop cost
-    int64_t feeDelta;          //!< Used for determining the priority of the transaction for mining in a block
+    int64_t feeDelta{0};            //!< Used for determining the priority of the transaction for mining in a block
     LockPoints lockPoints;     //!< Track the height and time at which tx was final
 
     // Information about descendants of this transaction that are in the
     // mempool; if we remove this transaction we must remove all of these
     // descendants as well.
-    uint64_t nCountWithDescendants;  //!< number of descendant transactions
+    uint64_t nCountWithDescendants{1}; //!< number of descendant transactions
     uint64_t nSizeWithDescendants;   //!< ... and size
     CAmount nModFeesWithDescendants; //!< ... and total fees (all including us)
 
     // Analogous statistics for ancestor transactions
-    uint64_t nCountWithAncestors;
+    uint64_t nCountWithAncestors{1};
     uint64_t nSizeWithAncestors;
     CAmount nModFeesWithAncestors;
     int64_t nSigOpCostWithAncestors;
 
 public:
-    CTxMemPoolEntry(const CTransactionRef& _tx, const CAmount& _nFee,
-                    int64_t _nTime, unsigned int _entryHeight,
-                    bool spendsCoinbase,
-                    int64_t nSigOpsCost, LockPoints lp);
+    CTxMemPoolEntry(const CTransactionRef& tx, CAmount fee,
+                    int64_t time, unsigned int entry_height,
+                    bool spends_coinbase,
+                    int64_t sigops_cost, LockPoints lp);
 
     const CTransaction& GetTx() const { return *this->tx; }
     CTransactionRef GetSharedTx() const { return this->tx; }