Use subrange instead of drop_view

Author: winner245

libcxx/test/benchmarks/algorithms/move.bench.cpp

@@ -26,7 +26,8 @@ void bm_ranges_move_vb(benchmark::State& state) {
     if constexpr (aligned) {
       benchmark::DoNotOptimize(std::ranges::move(*in, std::ranges::begin(*out)));
     } else {
-      benchmark::DoNotOptimize(std::ranges::move(*in | std::views::drop(4), std::ranges::begin(*out)));
+      benchmark::DoNotOptimize(
+          std::ranges::move(std::views::counted(in->begin() + 4, n - 4), std::ranges::begin(*out)));
     }
     std::swap(in, out);
     benchmark::DoNotOptimize(in);

libcxx/test/benchmarks/algorithms/move_backward.bench.cpp

@@ -26,7 +26,8 @@ void bm_ranges_move_backward_vb(benchmark::State& state) {
     if constexpr (aligned) {
       benchmark::DoNotOptimize(std::ranges::move_backward(*in, std::ranges::end(*out)));
     } else {
-      benchmark::DoNotOptimize(std::ranges::move_backward(*in | std::views::take(n - 4), std::ranges::end(*out)));
+      benchmark::DoNotOptimize(
+          std::ranges::move_backward(std::views::counted(in->begin(), n - 4), std::ranges::end(*out)));
     }
     std::swap(in, out);
     benchmark::DoNotOptimize(in);

libcxx/test/std/algorithms/alg.modifying.operations/alg.move/ranges.move.pass.cpp

@@ -203,7 +203,7 @@ constexpr bool test_vector_bool(std::size_t N) {
   { // Test move with unaligned bytes
     std::vector<bool> in{v};
     std::vector<bool> out(N);
-    std::ranges::move(in | std::views::drop(4), out.begin());
+    std::ranges::move(std::views::counted(in.begin() + 4, N - 4), out.begin());
     assert(std::ranges::equal(v | std::views::drop(4), out | std::views::take(N - 4)));
   }
 

libcxx/test/std/algorithms/alg.modifying.operations/alg.move/ranges.move_backward.pass.cpp

@@ -208,7 +208,7 @@ constexpr bool test_vector_bool(std::size_t N) {
   { // Test move_backward with unaligned bytes
     std::vector<bool> in{v};
     std::vector<bool> out(N);
-    std::ranges::move_backward(in | std::views::take(N - 4), out.end());
+    std::ranges::move_backward(std::views::counted(in.begin(), N - 4), out.end());
     assert(std::ranges::equal(v | std::views::take(N - 4), out | std::views::drop(4)));
   }