From 20b68b01282781d91bbbdf621b0d749808eaae4a Mon Sep 17 00:00:00 2001
From: Tolik Zinovyev <tolik@bu.edu>
Date: Thu, 18 Apr 2024 10:24:53 -0400
Subject: [PATCH] wifi: avoid copying PpduFormats.

---
 src/wifi/model/phy-entity.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/wifi/model/phy-entity.cc b/src/wifi/model/phy-entity.cc
index e8b1da69f..5d76240f2 100644
--- a/src/wifi/model/phy-entity.cc
+++ b/src/wifi/model/phy-entity.cc
@@ -161,7 +161,7 @@ PhyEntity::GetSigMode(WifiPpduField field, const WifiTxVector& txVector) const
 WifiPpduField
 PhyEntity::GetNextField(WifiPpduField currentField, WifiPreamble preamble) const
 {
-    auto ppduFormats = GetPpduFormats();
+    const auto& ppduFormats = GetPpduFormats();
     const auto itPpdu = ppduFormats.find(preamble);
     if (itPpdu != ppduFormats.end())
     {
@@ -371,7 +371,7 @@ PhyEntity::DoStartReceiveField(WifiPpduField field, Ptr<Event> event)
     NS_LOG_FUNCTION(this << field << *event);
     NS_ASSERT(field != WIFI_PPDU_FIELD_PREAMBLE &&
               field != WIFI_PPDU_FIELD_DATA); // handled apart for the time being
-    auto ppduFormats = GetPpduFormats();
+    const auto& ppduFormats = GetPpduFormats();
     auto itFormat = ppduFormats.find(event->GetPpdu()->GetPreamble());
     if (itFormat != ppduFormats.end())
     {