1 files changed, 40 insertions, 13 deletions

diff --git a/contrib/llvm-project/libcxx/include/__algorithm/pstl_generate.h b/contrib/llvm-project/libcxx/include/__algorithm/pstl_generate.h
index e1ba0183dcba..56538392d5b5 100644
--- a/contrib/llvm-project/libcxx/include/__algorithm/pstl_generate.h
+++ b/contrib/llvm-project/libcxx/include/__algorithm/pstl_generate.h
@@ -14,10 +14,12 @@
 #include <__algorithm/pstl_frontend_dispatch.h>
 #include <__config>
 #include <__iterator/cpp17_iterator_concepts.h>
+#include <__iterator/iterator_traits.h>
 #include <__type_traits/enable_if.h>
 #include <__type_traits/is_execution_policy.h>
 #include <__type_traits/remove_cvref.h>
 #include <__utility/move.h>
+#include <optional>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -35,13 +37,13 @@ template <class _ExecutionPolicy,
           class _Generator,
           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
-_LIBCPP_HIDE_FROM_ABI void
-generate(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Generator __gen) {
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__empty>
+__generate(_ExecutionPolicy&& __policy, _ForwardIterator&& __first, _ForwardIterator&& __last, _Generator&& __gen) {
   _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
-  std::__pstl_frontend_dispatch(
-      _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_generate),
+  return std::__pstl_frontend_dispatch(
+      _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_generate, _RawPolicy),
       [&__policy](_ForwardIterator __g_first, _ForwardIterator __g_last, _Generator __g_gen) {
-        std::for_each(
+        return std::__for_each(
             __policy, std::move(__g_first), std::move(__g_last), [&](__iter_reference<_ForwardIterator> __element) {
               __element = __g_gen();
             });
@@ -51,6 +53,18 @@ generate(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator
       std::move(__gen));
 }
 
+template <class _ExecutionPolicy,
+          class _ForwardIterator,
+          class _Generator,
+          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
+          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
+_LIBCPP_HIDE_FROM_ABI void
+generate(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Generator __gen) {
+  _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
+  if (!std::__generate(__policy, std::move(__first), std::move(__last), std::move(__gen)))
+    std::__throw_bad_alloc();
+}
+
 template <class>
 void __pstl_generate_n();
 
@@ -60,21 +74,34 @@ template <class _ExecutionPolicy,
           class _Generator,
           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
-_LIBCPP_HIDE_FROM_ABI void
-generate_n(_ExecutionPolicy&& __policy, _ForwardIterator __first, _Size __n, _Generator __gen) {
-  _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
-  std::__pstl_frontend_dispatch(
-      _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_generate_n),
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__empty>
+__generate_n(_ExecutionPolicy&& __policy, _ForwardIterator&& __first, _Size&& __n, _Generator&& __gen) {
+  return std::__pstl_frontend_dispatch(
+      _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_generate_n, _RawPolicy),
       [&__policy](_ForwardIterator __g_first, _Size __g_n, _Generator __g_gen) {
-        std::for_each_n(__policy, std::move(__g_first), __g_n, [&](__iter_reference<_ForwardIterator> __element) {
-          __element = __g_gen();
-        });
+        return std::__for_each_n(
+            __policy, std::move(__g_first), std::move(__g_n), [&](__iter_reference<_ForwardIterator> __element) {
+              __element = __g_gen();
+            });
       },
       std::move(__first),
       __n,
       std::move(__gen));
 }
 
+template <class _ExecutionPolicy,
+          class _ForwardIterator,
+          class _Size,
+          class _Generator,
+          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
+          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
+_LIBCPP_HIDE_FROM_ABI void
+generate_n(_ExecutionPolicy&& __policy, _ForwardIterator __first, _Size __n, _Generator __gen) {
+  _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
+  if (!std::__generate_n(__policy, std::move(__first), std::move(__n), std::move(__gen)))
+    std::__throw_bad_alloc();
+}
+
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17