Revert "[libc++][PSTL] Implement std::copy{,_n}"

This reverts commit b049fc0.

The wrong patch was landed.

Author: philnik777

libcxx/include/CMakeLists.txt

@@ -79,7 +79,6 @@ set(files
   __algorithm/pstl_backends/cpu_backends/for_each.h
   __algorithm/pstl_backends/cpu_backends/serial.h
   __algorithm/pstl_backends/cpu_backends/transform.h
-  __algorithm/pstl_copy.h
   __algorithm/pstl_fill.h
   __algorithm/pstl_find.h
   __algorithm/pstl_for_each.h

libcxx/include/__algorithm/pstl_copy.h

@@ -112,6 +112,14 @@ __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, _ForwardItera
 
 // [alg.copy]
 
+template <class _ExecutionPolicy, class _ForwardIterator1, class _ForwardIterator2>
+__pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, _ForwardIterator2>
+copy(_ExecutionPolicy&& __exec, _ForwardIterator1 __first, _ForwardIterator1 __last, _ForwardIterator2 __result);
+
+template <class _ExecutionPolicy, class _ForwardIterator1, class _Size, class _ForwardIterator2>
+__pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, _ForwardIterator2>
+copy_n(_ExecutionPolicy&& __exec, _ForwardIterator1 __first, _Size __n, _ForwardIterator2 __result);
+
 template <class _ExecutionPolicy, class _ForwardIterator1, class _ForwardIterator2, class _Predicate>
 __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, _ForwardIterator2>
 copy_if(_ExecutionPolicy&& __exec,

libcxx/include/__pstl/internal/glue_algorithm_defs.h

@@ -178,6 +178,42 @@ __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, _ForwardItera
 
 // [alg.copy]
 
+template <class _ExecutionPolicy, class _ForwardIterator1, class _ForwardIterator2>
+__pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, _ForwardIterator2>
+copy(_ExecutionPolicy&& __exec, _ForwardIterator1 __first, _ForwardIterator1 __last, _ForwardIterator2 __result) {
+  auto __dispatch_tag = __pstl::__internal::__select_backend(__exec, __first, __result);
+
+  using __is_vector = typename decltype(__dispatch_tag)::__is_vector;
+
+  return __pstl::__internal::__pattern_walk2_brick(
+      __dispatch_tag,
+      std::forward<_ExecutionPolicy>(__exec),
+      __first,
+      __last,
+      __result,
+      [](_ForwardIterator1 __begin, _ForwardIterator1 __end, _ForwardIterator2 __res) {
+        return __pstl::__internal::__brick_copy(__begin, __end, __res, __is_vector{});
+      });
+}
+
+template <class _ExecutionPolicy, class _ForwardIterator1, class _Size, class _ForwardIterator2>
+__pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, _ForwardIterator2>
+copy_n(_ExecutionPolicy&& __exec, _ForwardIterator1 __first, _Size __n, _ForwardIterator2 __result) {
+  auto __dispatch_tag = __pstl::__internal::__select_backend(__exec, __first, __result);
+
+  using __is_vector = typename decltype(__dispatch_tag)::__is_vector;
+
+  return __pstl::__internal::__pattern_walk2_brick_n(
+      __dispatch_tag,
+      std::forward<_ExecutionPolicy>(__exec),
+      __first,
+      __n,
+      __result,
+      [](_ForwardIterator1 __begin, _Size __sz, _ForwardIterator2 __res) {
+        return __pstl::__internal::__brick_copy_n(__begin, __sz, __res, __is_vector{});
+      });
+}
+
 template <class _ExecutionPolicy, class _ForwardIterator1, class _ForwardIterator2, class _Predicate>
 __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, _ForwardIterator2>
 copy_if(_ExecutionPolicy&& __exec,

libcxx/include/__pstl/internal/glue_algorithm_impl.h

@@ -1789,7 +1789,6 @@ template <class BidirectionalIterator, class Compare>
 #include <__algorithm/pop_heap.h>
 #include <__algorithm/prev_permutation.h>
 #include <__algorithm/pstl_any_all_none_of.h>
-#include <__algorithm/pstl_copy.h>
 #include <__algorithm/pstl_fill.h>
 #include <__algorithm/pstl_find.h>
 #include <__algorithm/pstl_for_each.h>