Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/unittests/ADT/IListNodeTest.cpp

@@ -0,0 +1,70 @@
+//===- unittests/ADT/IListNodeTest.cpp - ilist_node unit tests ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/ilist_node.h"
+#include "gtest/gtest.h"
+#include <type_traits>
+
+using namespace llvm;
+using namespace llvm::ilist_detail;
+
+namespace {
+
+struct Node;
+
+struct TagA {};
+struct TagB {};
+
+TEST(IListNodeTest, Options) {
+  static_assert(
+      std::is_same<compute_node_options<Node>::type,
+                   compute_node_options<Node, ilist_tag<void>>::type>::value,
+      "default tag is void");
+  static_assert(
+      !std::is_same<compute_node_options<Node, ilist_tag<TagA>>::type,
+                    compute_node_options<Node, ilist_tag<void>>::type>::value,
+      "default tag is void, different from TagA");
+  static_assert(
+      !std::is_same<compute_node_options<Node, ilist_tag<TagA>>::type,
+                    compute_node_options<Node, ilist_tag<TagB>>::type>::value,
+      "TagA is not TagB");
+  static_assert(
+      std::is_same<
+          compute_node_options<Node, ilist_sentinel_tracking<false>>::type,
+          compute_node_options<Node, ilist_sentinel_tracking<false>,
+                               ilist_tag<void>>::type>::value,
+      "default tag is void, even with sentinel tracking off");
+  static_assert(
+      std::is_same<
+          compute_node_options<Node, ilist_sentinel_tracking<false>>::type,
+          compute_node_options<Node, ilist_tag<void>,
+                               ilist_sentinel_tracking<false>>::type>::value,
+      "order shouldn't matter");
+  static_assert(
+      std::is_same<
+          compute_node_options<Node, ilist_sentinel_tracking<true>>::type,
+          compute_node_options<Node, ilist_sentinel_tracking<true>,
+                               ilist_tag<void>>::type>::value,
+      "default tag is void, even with sentinel tracking on");
+  static_assert(
+      std::is_same<
+          compute_node_options<Node, ilist_sentinel_tracking<true>>::type,
+          compute_node_options<Node, ilist_tag<void>,
+                               ilist_sentinel_tracking<true>>::type>::value,
+      "order shouldn't matter");
+  static_assert(
+      std::is_same<
+          compute_node_options<Node, ilist_sentinel_tracking<true>,
+                               ilist_tag<TagA>>::type,
+          compute_node_options<Node, ilist_tag<TagA>,
+                               ilist_sentinel_tracking<true>>::type>::value,
+      "order shouldn't matter with real tags");
+}
+
+} // end namespace