| /* |
| * Copyright 2010 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // Author: jmarantz@google.com (Joshua Marantz) |
| |
| // Unit-test RefCountedPtr. |
| |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/gtest.h" |
| #include "pagespeed/kernel/base/ref_counted_ptr.h" |
| |
| namespace net_instaweb { |
| |
| namespace { |
| |
| int counter = 0; |
| |
| class SimpleClass { |
| public: |
| SimpleClass() : index_(counter++) {} |
| int index() const { return index_; } |
| |
| private: |
| int index_; |
| DISALLOW_COPY_AND_ASSIGN(SimpleClass); |
| }; |
| |
| class BaseClass : public RefCounted<BaseClass> { |
| public: |
| BaseClass() {} |
| int index() const { return simple_.index(); } |
| |
| protected: |
| virtual ~BaseClass() {} |
| REFCOUNT_FRIEND_DECLARATION(BaseClass); |
| |
| private: |
| SimpleClass simple_; |
| DISALLOW_COPY_AND_ASSIGN(BaseClass); |
| }; |
| |
| struct DerivedA : public BaseClass {}; |
| struct DerivedB : public BaseClass {}; |
| |
| } // namespace |
| |
| typedef RefCountedObj<SimpleClass> SimplePtr; |
| typedef RefCountedPtr<BaseClass> PolymorphicPtr; |
| |
| class RefCountedPtrTest : public testing::Test { |
| protected: |
| }; |
| |
| TEST_F(RefCountedPtrTest, Simple) { |
| SimplePtr simple1; |
| EXPECT_TRUE(simple1.unique()); |
| int index = simple1->index(); |
| SimplePtr simple2 = simple1; |
| EXPECT_FALSE(simple1.unique()); |
| EXPECT_FALSE(simple2.unique()); |
| EXPECT_EQ(index, simple2->index()); |
| SimplePtr simple3(simple1); |
| EXPECT_FALSE(simple3.unique()); |
| EXPECT_EQ(index, simple3->index()); |
| SimplePtr simple4; |
| EXPECT_TRUE(simple4.unique()); |
| EXPECT_NE(index, simple4->index()); |
| } |
| |
| TEST_F(RefCountedPtrTest, Polymorphic) { |
| PolymorphicPtr poly1(new DerivedA); |
| int index = poly1->index(); |
| EXPECT_TRUE(poly1.unique()); |
| PolymorphicPtr poly2(poly1); |
| EXPECT_FALSE(poly1.unique()); |
| EXPECT_FALSE(poly2.unique()); |
| EXPECT_EQ(index, poly2->index()); |
| PolymorphicPtr poly3 = poly1; |
| EXPECT_FALSE(poly3.unique()); |
| EXPECT_EQ(index, poly3->index()); |
| PolymorphicPtr poly4(new DerivedB); |
| EXPECT_TRUE(poly4.unique()); |
| EXPECT_NE(index, poly4->index()); |
| PolymorphicPtr poly5; |
| EXPECT_TRUE(poly5.get() == NULL); |
| EXPECT_TRUE(poly5.unique()); |
| poly5.clear(); |
| EXPECT_TRUE(poly5.get() == NULL); |
| poly1.reset(new DerivedA); |
| EXPECT_TRUE(poly1.unique()); |
| } |
| |
| TEST_F(RefCountedPtrTest, Upcast) { |
| RefCountedPtr<DerivedA> derived(new DerivedA); |
| PolymorphicPtr base(derived); |
| EXPECT_FALSE(derived.unique()); |
| EXPECT_FALSE(base.unique()); |
| EXPECT_EQ(base->index(), derived->index()); |
| } |
| |
| TEST_F(RefCountedPtrTest, AssignUpcast) { |
| RefCountedPtr<DerivedA> derived(new DerivedA); |
| PolymorphicPtr base; |
| base = derived; |
| EXPECT_FALSE(derived.unique()); |
| EXPECT_FALSE(base.unique()); |
| EXPECT_EQ(base->index(), derived->index()); |
| } |
| |
| TEST_F(RefCountedPtrTest, ExplicitDowncast) { |
| PolymorphicPtr base(new DerivedB); |
| RefCountedPtr<DerivedB> derived = base.StaticCast<DerivedB>(); |
| EXPECT_FALSE(derived.unique()); |
| EXPECT_FALSE(base.unique()); |
| EXPECT_EQ(base->index(), derived->index()); |
| } |
| |
| // It is not possible to use RefCountedUpcast to perform a downcast. |
| // To prove that to yourself, uncomment this and compile: |
| // |
| // TEST_F(RefCountedPtrTest, DownCast) { |
| // PolymorphicPtr base(new DerivedB); |
| // RefCountedPtr<DerivedA> derived(base); |
| // EXPECT_FALSE(derived.unique()); |
| // EXPECT_FALSE(base.unique()); |
| // EXPECT_EQ(base->index(), derived->index()); |
| // } |
| |
| // It is not possible to use RefCountedUpcast to perform a cast between two |
| // unrelated pointers. To prove that to yourself, uncomment this: |
| // |
| // TEST_F(RefCountedPtrTest, CrossCast) { |
| // RefCountedPtr<DerivedA> derived_a(new DerivedA); |
| // RefCountedPtr<DerivedB> derived_b(derived_a); |
| // EXPECT_FALSE(derived_a.unique()); |
| // EXPECT_FALSE(derived_b.unique()); |
| // } |
| |
| } // namespace net_instaweb |