pitrou commented on code in PR #14571:
URL: https://github.com/apache/arrow/pull/14571#discussion_r1012296608


##########
cpp/src/arrow/testing/gtest_util.cc:
##########
@@ -679,7 +679,7 @@ void TestInitialized(const ArrayData& array) {
   // entire buffer data).  If not all bits are well-defined, Valgrind will
   // error with "Conditional jump or move depends on uninitialised value(s)".
   if (total_bit == 0) {
-    ++throw_away;
+    throw_away = throw_away + 1;

Review Comment:
   Because C++20 deprecates `++` and `+=` on volatile-qualified variables.



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