review fixes

change to a floating point number
remove unused variables

Author: haichangsi

src/example5.cpp

@@ -7,7 +7,7 @@
 
 namespace mhp = dr::mhp;
 
-using T = uint16_t;
+using T = float;
 using MDA = dr::mhp::distributed_mdarray<T, 2>;
 
 int main() {
@@ -29,15 +29,13 @@ int main() {
 
   auto in = dr::mhp::views::submdspan(a.view(), slice_starts, slice_ends);
   auto out = dr::mhp::views::submdspan(b.view(), slice_starts, slice_ends);
-  auto in_array = &a;
-  auto out_array = &b;
 
   auto mdspan_stencil_op = [](auto &&v) {
     auto [in, out] = v;
     out(0, 0) = (in(-1, 0) + in(0, -1) + in(0, 0) + in(0, 1) + in(1, 0)) / 4;
   };
 
-  mhp::halo(*in_array).exchange();
+  mhp::halo(a).exchange();
   mhp::stencil_for_each(mdspan_stencil_op, in, out);
 
   if (mhp::rank() == 0) {