optional header

PennyLaneAI · Oct 2, 2024 · c70de5d · c70de5d
1 parent a127f33
commit c70de5d
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/pennylane_lightning/core/src/simulators/lightning_gpu/measurements/MeasurementsGPU.hpp b/pennylane_lightning/core/src/simulators/lightning_gpu/measurements/MeasurementsGPU.hpp
@@ -25,6 +25,7 @@
 #include <cuda.h>
 #include <cusparse.h>
 #include <custatevec.h> // custatevecApplyMatrix
+#include <optional>
 #include <random>
 #include <type_traits>
 #include <unordered_map>