From 288d85ddf2e0a0c9d25a23db56052883170466d0 Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Tue, 7 Jun 2016 13:44:56 +0200
Subject: [PATCH] Get rid of CTxMempool::lookup() entirely

---
 src/main.cpp                       |  4 +++-
 src/test/policyestimator_tests.cpp | 18 +++++++++---------
 src/txmempool.cpp                  | 16 +++-------------
 src/txmempool.h                    |  1 -
 4 files changed, 15 insertions(+), 24 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index db0580bda..b581ece09 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1445,8 +1445,10 @@ bool GetTransaction(const uint256 &hash, CTransaction &txOut, const Consensus::P
 
     LOCK(cs_main);
 
-    if (mempool.lookup(hash, txOut))
+    std::shared_ptr<const CTransaction> ptx = mempool.get(hash);
+    if (ptx)
     {
+        txOut = *ptx;
         return true;
     }
 
diff --git a/src/test/policyestimator_tests.cpp b/src/test/policyestimator_tests.cpp
index 644c3da21..2b00e6f56 100644
--- a/src/test/policyestimator_tests.cpp
+++ b/src/test/policyestimator_tests.cpp
@@ -74,9 +74,9 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
             // 9/10 blocks add 2nd highest and so on until ...
             // 1/10 blocks add lowest fee/pri transactions
             while (txHashes[9-h].size()) {
-                CTransaction btx;
-                if (mpool.lookup(txHashes[9-h].back(), btx))
-                    block.push_back(btx);
+                std::shared_ptr<const CTransaction> ptx = mpool.get(txHashes[9-h].back());
+                if (ptx)
+                    block.push_back(*ptx);
                 txHashes[9-h].pop_back();
             }
         }
@@ -160,9 +160,9 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
     // Estimates should still not be below original
     for (int j = 0; j < 10; j++) {
         while(txHashes[j].size()) {
-            CTransaction btx;
-            if (mpool.lookup(txHashes[j].back(), btx))
-                block.push_back(btx);
+            std::shared_ptr<const CTransaction> ptx = mpool.get(txHashes[j].back());
+            if (ptx)
+                block.push_back(*ptx);
             txHashes[j].pop_back();
         }
     }
@@ -181,9 +181,9 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
                 tx.vin[0].prevout.n = 10000*blocknum+100*j+k;
                 uint256 hash = tx.GetHash();
                 mpool.addUnchecked(hash, entry.Fee(feeV[k/4][j]).Time(GetTime()).Priority(priV[k/4][j]).Height(blocknum).FromTx(tx, &mpool));
-                CTransaction btx;
-                if (mpool.lookup(hash, btx))
-                    block.push_back(btx);
+                std::shared_ptr<const CTransaction> ptx = mpool.get(hash);
+                if (ptx)
+                    block.push_back(*ptx);
             }
         }
         mpool.removeForBlock(block, ++blocknum, dummyConflicted);
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index d39c9577f..205ffd637 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -831,16 +831,6 @@ std::shared_ptr<const CTransaction> CTxMemPool::get(const uint256& hash) const
     return i->GetSharedTx();
 }
 
-bool CTxMemPool::lookup(uint256 hash, CTransaction& result) const
-{
-    auto tx = get(hash);
-    if (tx) {
-        result = *tx;
-        return true;
-    }
-    return false;
-}
-
 TxMempoolInfo CTxMemPool::info(const uint256& hash) const
 {
     LOCK(cs);
@@ -960,9 +950,9 @@ bool CCoinsViewMemPool::GetCoins(const uint256 &txid, CCoins &coins) const {
     // If an entry in the mempool exists, always return that one, as it's guaranteed to never
     // conflict with the underlying cache, and it cannot have pruned entries (as it contains full)
     // transactions. First checking the underlying cache risks returning a pruned entry instead.
-    CTransaction tx;
-    if (mempool.lookup(txid, tx)) {
-        coins = CCoins(tx, MEMPOOL_HEIGHT);
+    shared_ptr<const CTransaction> ptx = mempool.get(txid);
+    if (ptx) {
+        coins = CCoins(*ptx, MEMPOOL_HEIGHT);
         return true;
     }
     return (base->GetCoins(txid, coins) && !coins.IsPruned());
diff --git a/src/txmempool.h b/src/txmempool.h
index 2f407fe00..f0e9b2e2c 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -607,7 +607,6 @@ public:
         return (mapTx.count(hash) != 0);
     }
 
-    bool lookup(uint256 hash, CTransaction& result) const;
     std::shared_ptr<const CTransaction> get(const uint256& hash) const;
     TxMempoolInfo info(const uint256& hash) const;
     std::vector<TxMempoolInfo> infoAll() const;