diff --git a/cpp/src/arrow/util/cancel.cc b/cpp/src/arrow/util/cancel.cc
index b3a0c1f92c24e..242852f46b73c 100644
--- a/cpp/src/arrow/util/cancel.cc
+++ b/cpp/src/arrow/util/cancel.cc
@@ -50,7 +50,7 @@ struct StopSourceImpl {
   Status cancel_error_;
 };
 
-StopSource::StopSource() : impl_(new StopSourceImpl) {}
+StopSource::StopSource() : impl_(std::make_shared<StopSourceImpl>()) {}
 
 StopSource::~StopSource() = default;
 
diff --git a/cpp/src/arrow/util/cancel.h b/cpp/src/arrow/util/cancel.h
index f0d704b2ce086..863b2c4e8ca90 100644
--- a/cpp/src/arrow/util/cancel.h
+++ b/cpp/src/arrow/util/cancel.h
@@ -58,7 +58,7 @@ class ARROW_EXPORT StopSource {
 class ARROW_EXPORT StopToken {
  public:
   // Public for Cython
-  StopToken() {}
+  StopToken() = default;
 
   explicit StopToken(std::shared_ptr<StopSourceImpl> impl) : impl_(std::move(impl)) {}
 
diff --git a/cpp/src/arrow/util/thread_pool.cc b/cpp/src/arrow/util/thread_pool.cc
index d59d1f20de7c3..8aa6d548893de 100644
--- a/cpp/src/arrow/util/thread_pool.cc
+++ b/cpp/src/arrow/util/thread_pool.cc
@@ -460,7 +460,10 @@ static void WorkerLoop(std::shared_ptr<ThreadPool::State> state,
             std::move(task.stop_callback)(stop_token->Poll());
           }
         }
-        ARROW_UNUSED(std::move(task));  // release resources before waiting for lock
+        {
+          auto tmp_task = std::move(task);  // release resources before waiting for lock
+          ARROW_UNUSED(tmp_task);
+        }
         lock.lock();
       }
       if (ARROW_PREDICT_FALSE(--state->tasks_queued_or_running_ == 0)) {