fixes

pyHealpix/pyHealpix.cc

@@ -76,7 +76,7 @@ template<typename T1, typename T2, size_t nd1, size_t nd2, typename Func>
     func(iin, iout);
     iin.inc();iout.inc();
     }
-  return aout;
+  return move(aout);
   }
 
 class Pyhpbase
@@ -198,7 +198,7 @@ class Pyhpbase
         oref(i,0)=pixset.ivbegin(i);
         oref(i,1)=pixset.ivend(i);
         }
-      return res;
+      return move(res);
       }
   };
 
@@ -240,7 +240,7 @@ py::array local_v_angle (const py::array &v1, const py::array &v2)
                         vec3(ii2(i,0),ii2(i,1),ii2(i,2)));
     ii1.inc();ii2.inc();iout.inc();
     }
-  return angle;
+  return move(angle);
   }
 
 const char *pyHealpix_DS = R"""(

src/mr_util/infra/mav.h

@@ -26,6 +26,7 @@
 #include <array>
 #include <vector>
 #include <memory>
+#include <numeric>
 #include "mr_util/infra/error_handling.h"
 
 namespace mr {