DO NOT COMMIT: NullPtr support

base/nullptr_unittest.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/nullptr.h"
+
+#include "base/basictypes.h"
+#include "base/template_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+// Overloaded free function used to test pointers do not match nullptr_t.
+bool VoidParamMatchesNullptr(base::nullptr_t pointer) {
+  return true;
+}
+
+bool VoidParamMatchesNullptr(void* pointer) {
+  return false;
+}
+
+// Overloaded free function used to test integral constants do not
+// match nullptr_t.
+bool IntParamMatchesNullptr(base::nullptr_t param) {
+  return true;
+}
+
+bool IntParamMatchesNullptr(intptr_t param) {
+  return false;
+}
+
+template <typename T> struct TemplateMatchesNullptr : base::false_type {};
+template <> struct TemplateMatchesNullptr<base::nullptr_t> : base::true_type {};
+
+COMPILE_ASSERT(!TemplateMatchesNullptr<int>::value, MatchesNullptr);
+COMPILE_ASSERT(!TemplateMatchesNullptr<void*>::value, MatchesNullptr);
+COMPILE_ASSERT(TemplateMatchesNullptr<base::nullptr_t>::value, MatchesNullptr);
+
+template <typename T>
+bool TemplateMethodMatchesNullptr(T param) {
+  return false;
+}
+
+template <>
+bool TemplateMethodMatchesNullptr<base::nullptr_t>(base::nullptr_t param) {
+  return true;
+}
+
+}  // namespace
+
+TEST(NullptrTest, VoidParamsDontMatch) {
+  void* dummy_param = NULL;
+  EXPECT_FALSE(VoidParamMatchesNullptr(dummy_param));
+  EXPECT_TRUE(VoidParamMatchesNullptr(base::NullPtr));
+}
+
+TEST(NullptrTest, IntParamsDontMatch) {
+  int dummy_param = 0;
+  EXPECT_FALSE(IntParamMatchesNullptr(dummy_param));
+  EXPECT_TRUE(IntParamMatchesNullptr(base::NullPtr));
+}
+
+TEST(NullptrTest, TemplateMethodParamsDontMatch) {
+  void* dummy_param = NULL;
+  EXPECT_FALSE(TemplateMethodMatchesNullptr(dummy_param));
+  EXPECT_TRUE(TemplateMethodMatchesNullptr(base::NullPtr));
+}