move-only: Create src/kernel/mempool_removal_reason.h

This is needed for a future commit. Can be reviewed with:
--color-moved=dimmed-zebra

src/Makefile.am

@@ -190,6 +190,7 @@ BITCOIN_CORE_H = \
   kernel/mempool_limits.h \
   kernel/mempool_options.h \
   kernel/mempool_persist.h \
+  kernel/mempool_removal_reason.h \
   kernel/notifications_interface.h \
   kernel/validation_cache_sizes.h \
   key.h \
@@ -401,6 +402,7 @@ libbitcoin_node_a_SOURCES = \
   kernel/context.cpp \
   kernel/cs_main.cpp \
   kernel/mempool_persist.cpp \
+  kernel/mempool_removal_reason.cpp \
   mapport.cpp \
   net.cpp \
   net_processing.cpp \
@@ -940,6 +942,7 @@ libbitcoinkernel_la_SOURCES = \
   kernel/context.cpp \
   kernel/cs_main.cpp \
   kernel/mempool_persist.cpp \
+  kernel/mempool_removal_reason.cpp \
   key.cpp \
   logging.cpp \
   node/blockstorage.cpp \

src/kernel/mempool_removal_reason.cpp

@@ -0,0 +1,21 @@
+// Copyright (c) 2016-present The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or https://opensource.org/license/mit/.
+
+#include <kernel/mempool_removal_reason.h>
+
+#include <cassert>
+#include <string>
+
+std::string RemovalReasonToString(const MemPoolRemovalReason& r) noexcept
+{
+    switch (r) {
+        case MemPoolRemovalReason::EXPIRY: return "expiry";
+        case MemPoolRemovalReason::SIZELIMIT: return "sizelimit";
+        case MemPoolRemovalReason::REORG: return "reorg";
+        case MemPoolRemovalReason::BLOCK: return "block";
+        case MemPoolRemovalReason::CONFLICT: return "conflict";
+        case MemPoolRemovalReason::REPLACED: return "replaced";
+    }
+    assert(false);
+}

src/kernel/mempool_removal_reason.h

@@ -0,0 +1,24 @@
+// Copyright (c) 2016-present The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or https://opensource.org/license/mit/.
+
+#ifndef BITCOIN_KERNEL_MEMPOOL_REMOVAL_REASON_H
+#define BITCOIN_KERNEL_MEMPOOL_REMOVAL_REASON_H
+
+#include <string>
+
+/** Reason why a transaction was removed from the mempool,
+ * this is passed to the notification signal.
+ */
+enum class MemPoolRemovalReason {
+    EXPIRY,      //!< Expired from mempool
+    SIZELIMIT,   //!< Removed in size limiting
+    REORG,       //!< Removed for reorganization
+    BLOCK,       //!< Removed for block
+    CONFLICT,    //!< Removed for conflict with in-block transaction
+    REPLACED,    //!< Removed for replacement
+};
+
+std::string RemovalReasonToString(const MemPoolRemovalReason& r) noexcept;
+
+#endif // BITCOIN_KERNEL_MEMPOOL_REMOVAL_REASON_H

src/txmempool.cpp

@@ -1197,19 +1197,6 @@ void CTxMemPool::SetLoadTried(bool load_tried)
     m_load_tried = load_tried;
 }
 
-std::string RemovalReasonToString(const MemPoolRemovalReason& r) noexcept
-{
-    switch (r) {
-        case MemPoolRemovalReason::EXPIRY: return "expiry";
-        case MemPoolRemovalReason::SIZELIMIT: return "sizelimit";
-        case MemPoolRemovalReason::REORG: return "reorg";
-        case MemPoolRemovalReason::BLOCK: return "block";
-        case MemPoolRemovalReason::CONFLICT: return "conflict";
-        case MemPoolRemovalReason::REPLACED: return "replaced";
-    }
-    assert(false);
-}
-
 std::vector<CTxMemPool::txiter> CTxMemPool::GatherClusters(const std::vector<uint256>& txids) const
 {
     AssertLockHeld(cs);

src/txmempool.h

@@ -6,14 +6,14 @@
 #ifndef BITCOIN_TXMEMPOOL_H
 #define BITCOIN_TXMEMPOOL_H
 
-#include <kernel/mempool_limits.h>
-#include <kernel/mempool_options.h>
-
 #include <coins.h>
 #include <consensus/amount.h>
 #include <indirectmap.h>
 #include <kernel/cs_main.h>
-#include <kernel/mempool_entry.h>
+#include <kernel/mempool_entry.h>          // IWYU pragma: export
+#include <kernel/mempool_limits.h>         // IWYU pragma: export
+#include <kernel/mempool_options.h>        // IWYU pragma: export
+#include <kernel/mempool_removal_reason.h> // IWYU pragma: export
 #include <policy/feerate.h>
 #include <policy/packages.h>
 #include <primitives/transaction.h>
@@ -225,20 +225,6 @@ struct TxMempoolInfo
     int64_t nFeeDelta;
 };
 
-/** Reason why a transaction was removed from the mempool,
- * this is passed to the notification signal.
- */
-enum class MemPoolRemovalReason {
-    EXPIRY,      //!< Expired from mempool
-    SIZELIMIT,   //!< Removed in size limiting
-    REORG,       //!< Removed for reorganization
-    BLOCK,       //!< Removed for block
-    CONFLICT,    //!< Removed for conflict with in-block transaction
-    REPLACED,    //!< Removed for replacement
-};
-
-std::string RemovalReasonToString(const MemPoolRemovalReason& r) noexcept;
-
 /**
  * CTxMemPool stores valid-according-to-the-current-best-chain transactions
  * that may be included in the next block.