merge bitcoin#24531: Use designated initializers

src/Makefile.am

@@ -336,6 +336,7 @@ BITCOIN_CORE_H = \
   util/bip32.h \
   util/bytevectorhash.h \
   util/check.h \
+  util/designator.h \
   util/edge.h \
   util/enumerate.h \
   util/epochguard.h \

src/net.cpp

@@ -27,6 +27,7 @@
 #include <protocol.h>
 #include <random.h>
 #include <scheduler.h>
+#include <util/designator.h>
 #include <util/sock.h>
 #include <util/strencodings.h>
 #include <util/system.h>
@@ -1329,12 +1330,20 @@ bool CConnman::AttemptToEvictConnection()
                 }
             }
 
-            NodeEvictionCandidate candidate = {node->GetId(), node->m_connected, node->m_min_ping_time,
-                                               node->m_last_block_time, node->m_last_tx_time,
-                                               node->m_has_all_wanted_services,
-                                               node->m_relays_txs.load(), node->m_bloom_filter_loaded.load(),
-                                               node->nKeyedNetGroup, node->m_prefer_evict, node->addr.IsLocal(),
-                                               node->ConnectedThroughNetwork()};
+            NodeEvictionCandidate candidate{
+                Desig(id) node->GetId(),
+                Desig(m_connected) node->m_connected,
+                Desig(m_min_ping_time) node->m_min_ping_time,
+                Desig(m_last_block_time) node->m_last_block_time,
+                Desig(m_last_tx_time) node->m_last_tx_time,
+                Desig(fRelevantServices) node->m_has_all_wanted_services,
+                Desig(m_relay_txs) node->m_relays_txs.load(),
+                Desig(fBloomFilter) node->m_bloom_filter_loaded.load(),
+                Desig(nKeyedNetGroup) node->nKeyedNetGroup,
+                Desig(prefer_evict) node->m_prefer_evict,
+                Desig(m_is_local) node->addr.IsLocal(),
+                Desig(m_network) node->ConnectedThroughNetwork(),
+            };
             vEvictionCandidates.push_back(candidate);
         }
     }

src/util/designator.h

@@ -0,0 +1,21 @@
+// Copyright (c) 2022 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_DESIGNATOR_H
+#define BITCOIN_UTIL_DESIGNATOR_H
+
+/**
+ * Designated initializers can be used to avoid ordering mishaps in aggregate
+ * initialization. However, they do not prevent uninitialized members. The
+ * checks can be disabled by defining DISABLE_DESIGNATED_INITIALIZER_ERRORS.
+ * This should only be needed on MSVC 2019. MSVC 2022 supports them with the
+ * option "/std:c++20"
+ */
+#ifndef DISABLE_DESIGNATED_INITIALIZER_ERRORS
+#define Desig(field_name) .field_name =
+#else
+#define Desig(field_name)
+#endif
+
+#endif // BITCOIN_UTIL_DESIGNATOR_H