[libcxx-commits] [libcxx] [libc++][PSTL] Implement std::equal (PR #72448)
Louis Dionne via libcxx-commits
libcxx-commits at lists.llvm.org
Fri Nov 17 07:58:24 PST 2023
================
@@ -0,0 +1,167 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_PSTL_EQUAL_H
+#define _LIBCPP___ALGORITHM_PSTL_EQUAL_H
+
+#include <__algorithm/pstl_frontend_dispatch.h>
+#include <__config>
+#include <__functional/operations.h>
+#include <__numeric/pstl_transform_reduce.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+#endif
+
+#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class>
+void __pstl_equal();
+
+template <class _ExecutionPolicy,
+ class _ForwardIterator1,
+ class _ForwardIterator2,
+ class _Pred,
+ class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
+ enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<bool>
+__equal(_ExecutionPolicy&& __policy,
+ _ForwardIterator1&& __first1,
+ _ForwardIterator1&& __last1,
+ _ForwardIterator2&& __first2,
+ _Pred&& __pred) noexcept {
+ return std::__pstl_frontend_dispatch(
+ _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_equal),
+ [&__policy](
+ _ForwardIterator1 __g_first1, _ForwardIterator1 __g_last1, _ForwardIterator2 __g_first2, _Pred __g_pred) {
+ return std::__transform_reduce(
+ __policy,
+ std::move(__g_first1),
+ std::move(__g_last1),
+ std::move(__g_first2),
+ true,
+ std::logical_and{},
+ std::move(__g_pred));
+ },
+ std::move(__first1),
+ std::move(__last1),
+ std::move(__first2),
+ std::move(__pred));
+}
+
+template <class _ExecutionPolicy,
+ class _ForwardIterator1,
+ class _ForwardIterator2,
+ class _Pred,
+ class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
+ enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
+_LIBCPP_HIDE_FROM_ABI bool
+equal(_ExecutionPolicy&& __policy,
+ _ForwardIterator1 __first1,
+ _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2,
+ _Pred __pred) {
+ auto __res = std::__equal(__policy, std::move(__first1), std::move(__last1), std::move(__first2), std::move(__pred));
+ if (!__res)
+ std::__throw_bad_alloc();
+ return *__res;
+}
+
+template <class _ExecutionPolicy,
+ class _ForwardIterator1,
+ class _ForwardIterator2,
+ enable_if_t<is_execution_policy_v<__remove_cvref_t<_ExecutionPolicy>>, int> = 0>
+_LIBCPP_HIDE_FROM_ABI bool
+equal(_ExecutionPolicy&& __policy, _ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) {
+ return std::equal(__policy, std::move(__first1), std::move(__last1), std::move(__first2), std::equal_to{});
+}
+
+template <class _ExecutionPolicy,
+ class _ForwardIterator1,
+ class _ForwardIterator2,
+ class _Pred,
+ class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
+ enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<bool>
+__equal(_ExecutionPolicy&& __policy,
+ _ForwardIterator1&& __first1,
+ _ForwardIterator1&& __last1,
+ _ForwardIterator2&& __first2,
+ _ForwardIterator2&& __last2,
+ _Pred&& __pred) noexcept {
+ return std::__pstl_frontend_dispatch(
+ _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_equal),
+ [&__policy](_ForwardIterator1 __g_first1,
+ _ForwardIterator1 __g_last1,
+ _ForwardIterator2 __g_first2,
+ _ForwardIterator2 __g_last2,
+ _Pred __g_pred) -> optional<bool> {
+ if constexpr (__has_random_access_iterator_category<_ForwardIterator1>::value &&
+ __has_random_access_iterator_category<_ForwardIterator2>::value) {
+ if (__g_last1 - __g_first1 != __g_last2 - __g_first2)
+ return false;
+ return std::__equal(
+ __policy, std::move(__g_first1), std::move(__g_last1), std::move(__g_first2), std::move(__g_pred));
+ } else {
+ (void)__policy; // Avoid unused lambda captue warning
----------------
ldionne wrote:
```suggestion
(void)__policy; // Avoid unused lambda capture warning
```
https://github.com/llvm/llvm-project/pull/72448
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