Merge pull request #22780 from ziglang/llvm20

LLVM 20

1 files changed, 80 insertions, 0 deletions

diff --git a/lib/libcxx/libc/src/__support/CPP/array.h b/lib/libcxx/libc/src/__support/CPP/array.h
new file mode 100644
index 0000000000..db0a986b71
--- /dev/null
+++ b/lib/libcxx/libc/src/__support/CPP/array.h
@@ -0,0 +1,80 @@
+//===-- A self contained equivalent of std::array ---------------*- C++ -*-===//
+//
+// 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 LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H
+#define LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H
+
+#include "src/__support/CPP/iterator.h" // reverse_iterator
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+#include <stddef.h> // For size_t.
+
+namespace LIBC_NAMESPACE_DECL {
+namespace cpp {
+
+template <class T, size_t N> struct array {
+  static_assert(N != 0,
+                "Cannot create a LIBC_NAMESPACE::cpp::array of size 0.");
+
+  T Data[N];
+  using value_type = T;
+  using iterator = T *;
+  using const_iterator = const T *;
+  using reverse_iterator = cpp::reverse_iterator<iterator>;
+  using const_reverse_iterator = cpp::reverse_iterator<const_iterator>;
+
+  LIBC_INLINE constexpr T *data() { return Data; }
+  LIBC_INLINE constexpr const T *data() const { return Data; }
+
+  LIBC_INLINE constexpr T &front() { return Data[0]; }
+  LIBC_INLINE constexpr const T &front() const { return Data[0]; }
+
+  LIBC_INLINE constexpr T &back() { return Data[N - 1]; }
+  LIBC_INLINE constexpr const T &back() const { return Data[N - 1]; }
+
+  LIBC_INLINE constexpr T &operator[](size_t Index) { return Data[Index]; }
+
+  LIBC_INLINE constexpr const T &operator[](size_t Index) const {
+    return Data[Index];
+  }
+
+  LIBC_INLINE constexpr size_t size() const { return N; }
+
+  LIBC_INLINE constexpr bool empty() const { return N == 0; }
+
+  LIBC_INLINE constexpr iterator begin() { return Data; }
+  LIBC_INLINE constexpr const_iterator begin() const { return Data; }
+  LIBC_INLINE constexpr const_iterator cbegin() const { return begin(); }
+
+  LIBC_INLINE constexpr iterator end() { return Data + N; }
+  LIBC_INLINE constexpr const_iterator end() const { return Data + N; }
+  LIBC_INLINE constexpr const_iterator cend() const { return end(); }
+
+  LIBC_INLINE constexpr reverse_iterator rbegin() {
+    return reverse_iterator{end()};
+  }
+  LIBC_INLINE constexpr const_reverse_iterator rbegin() const {
+    return const_reverse_iterator{end()};
+  }
+  LIBC_INLINE constexpr const_reverse_iterator crbegin() const {
+    return rbegin();
+  }
+
+  LIBC_INLINE constexpr reverse_iterator rend() {
+    return reverse_iterator{begin()};
+  }
+  LIBC_INLINE constexpr const_reverse_iterator rend() const {
+    return const_reverse_iterator{begin()};
+  }
+  LIBC_INLINE constexpr const_reverse_iterator crend() const { return rend(); }
+};
+
+} // namespace cpp
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_CPP_ARRAY_H