From 85342e2bcc4a144c9504e06eeffe6a785d62e39b Mon Sep 17 00:00:00 2001
From: Jonas Hahnfeld <jonas.hahnfeld@cern.ch>
Date: Fri, 30 Oct 2026 14:54:12 +0100
Subject: [PATCH] [df] Avoid captured structured bindings

They are a C++20 extension which Clang warns about.

(cherry picked from commit 44644e4171e34698a9a9ca9eba763832d06f1947)
---
 tree/dataframe/src/RNTupleDS.cxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tree/dataframe/src/RNTupleDS.cxx b/tree/dataframe/src/RNTupleDS.cxx
index 1628b5d6b7eb3..97953c08bc86e 100644
--- a/tree/dataframe/src/RNTupleDS.cxx
+++ b/tree/dataframe/src/RNTupleDS.cxx
@@ -1059,7 +1059,9 @@ void ROOT::RDF::RNTupleDS::ScheduleTasksForFileWithGlobalOffset(
    source->LoadAllPageLists();
 
    const std::uint64_t globalFileOffset = globalFileOffsets[fileIdx];
-   const auto [globalBegin, globalEnd] = fGlobalEntryRange.value();
+   // captured structured bindings are a C++20 extension
+   const auto globalBegin = fGlobalEntryRange.value().first;
+   const auto globalEnd = fGlobalEntryRange.value().second;
 
    const auto clustersAndEntries =
       [&]() -> std::pair<std::vector<ROOT::Internal::RNTupleClusterBoundaries>, ROOT::NTupleSize_t> {