add array header

include/openmc/array.h

@@ -0,0 +1,18 @@
+#ifndef OPENMC_ARRAY_H
+#define OPENMC_ARRAY_H
+
+/*
+ * See notes in include/openmc/vector.h
+ *
+ * In an implementation of OpenMC that uses an accelerator, we may remove the
+ * use of array below and replace it with a custom
+ * implementation behaving as expected on the device.
+ */
+
+#include <array>
+
+namespace openmc {
+using std::array;
+} // namespace openmc
+
+#endif // OPENMC_ARRAY_H