[libc-commits] [libc] Reland "[libc] Implement cpp::unique_ptr utility" (PR #233800)

[Pavel Labath via libc-commits]

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@@ -0,0 +1,244 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Unittests for UniquePtr.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/CPP/unique_ptr.h"
+#include "src/__support/CPP/utility.h"
+#include "src/__support/alloc-checker.h"
+#include "test/UnitTest/Test.h"
+
+using LIBC_NAMESPACE::AllocChecker;
+using LIBC_NAMESPACE::cpp::unique_ptr;
+
+struct DestructTracker {
+  int *destruct_count = nullptr;
+  DestructTracker() = default;
+  DestructTracker(int *count) : destruct_count(count) {}
+  ~DestructTracker() {
+    if (destruct_count)
+      (*destruct_count)++;
+  }
+};
+
+// Test basic construction, ownership, and destruction.
+TEST(LlvmLibcUniquePtrTest, Basic) {
+  int destruct_count = 0;
+  {
+    AllocChecker ac;
+    unique_ptr<DestructTracker> ptr(new (ac) DestructTracker(&destruct_count));
+    ASSERT_TRUE(static_cast<bool>(ac));
+    ASSERT_TRUE(static_cast<bool>(ptr));
+    ASSERT_EQ(destruct_count, 0);
+  }
+  ASSERT_EQ(destruct_count, 1);
+}
+
+// Test nullptr construction and behavior.
+TEST(LlvmLibcUniquePtrTest, Nullptr) {
+  unique_ptr<int> ptr(nullptr);
+  ASSERT_FALSE(static_cast<bool>(ptr));
+  ASSERT_EQ(ptr.get(), static_cast<int *>(nullptr));
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labath wrote:

Done.

https://github.com/llvm/llvm-project/pull/233800