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// Copyright 2019 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 "util/weak_ptr.h"
#include "gtest/gtest.h"
namespace openscreen {
namespace {
class SomeClass {
public:
virtual ~SomeClass() = default;
virtual int GetValue() const { return 42; }
};
struct SomeSubclass final : public SomeClass {
public:
~SomeSubclass() final = default;
int GetValue() const override { return 999; }
};
TEST(WeakPtrTest, InteractsWithNullptr) {
WeakPtr<const int> default_constructed; // Invoke default constructor.
EXPECT_TRUE(default_constructed == nullptr);
EXPECT_TRUE(nullptr == default_constructed);
EXPECT_FALSE(default_constructed != nullptr);
EXPECT_FALSE(nullptr != default_constructed);
WeakPtr<const int> null_constructed = nullptr; // Invoke construct-from-null.
EXPECT_TRUE(null_constructed == nullptr);
EXPECT_TRUE(nullptr == null_constructed);
EXPECT_FALSE(null_constructed != nullptr);
EXPECT_FALSE(nullptr != null_constructed);
const int foo = 42;
WeakPtrFactory<const int> factory(&foo);
WeakPtr<const int> not_null = factory.GetWeakPtr();
EXPECT_TRUE(not_null != nullptr);
EXPECT_TRUE(nullptr != not_null);
EXPECT_FALSE(not_null == nullptr);
EXPECT_FALSE(nullptr == not_null);
}
TEST(WeakPtrTest, CopyConstructsAndAssigns) {
SomeSubclass foo;
WeakPtrFactory<SomeSubclass> factory(&foo);
WeakPtr<SomeSubclass> weak_ptr = factory.GetWeakPtr();
EXPECT_TRUE(weak_ptr);
EXPECT_EQ(&foo, weak_ptr.get());
// Normal copy constructor.
WeakPtr<SomeSubclass> copied0 = weak_ptr;
EXPECT_EQ(&foo, weak_ptr.get()); // Did not mutate original.
EXPECT_TRUE(copied0);
EXPECT_EQ(&foo, copied0.get());
// Copy constructor, adding const qualifier.
WeakPtr<const SomeSubclass> copied1 = weak_ptr;
EXPECT_EQ(&foo, weak_ptr.get()); // Did not mutate original.
EXPECT_TRUE(copied1);
EXPECT_EQ(&foo, copied1.get());
// Normal copy assignment.
WeakPtr<SomeSubclass> assigned0;
EXPECT_FALSE(assigned0);
assigned0 = copied0;
EXPECT_EQ(&foo, copied0.get()); // Did not mutate original.
EXPECT_TRUE(assigned0);
EXPECT_EQ(&foo, assigned0.get());
// Copy assignment, adding const qualifier.
WeakPtr<const SomeSubclass> assigned1;
EXPECT_FALSE(assigned1);
assigned1 = copied0;
EXPECT_EQ(&foo, copied0.get()); // Did not mutate original.
EXPECT_TRUE(assigned1);
EXPECT_EQ(&foo, assigned1.get());
// Upcast copy constructor.
WeakPtr<SomeClass> copied2 = weak_ptr;
EXPECT_EQ(&foo, weak_ptr.get()); // Did not mutate original.
EXPECT_TRUE(copied2);
EXPECT_EQ(&foo, copied2.get());
EXPECT_EQ(999, (*copied2).GetValue());
EXPECT_EQ(999, copied2->GetValue());
// Upcast copy assignment.
WeakPtr<SomeClass> assigned2;
EXPECT_FALSE(assigned2);
assigned2 = weak_ptr;
EXPECT_EQ(&foo, weak_ptr.get()); // Did not mutate original.
EXPECT_TRUE(assigned2);
EXPECT_EQ(&foo, assigned2.get());
EXPECT_EQ(999, (*assigned2).GetValue());
EXPECT_EQ(999, assigned2->GetValue());
}
TEST(WeakPtrTest, MoveConstructsAndAssigns) {
SomeSubclass foo;
WeakPtrFactory<SomeSubclass> factory(&foo);
// Normal move constructor.
WeakPtr<SomeSubclass> weak_ptr = factory.GetWeakPtr();
WeakPtr<SomeSubclass> moved0 = std::move(weak_ptr);
EXPECT_FALSE(weak_ptr); // Original becomes null.
EXPECT_TRUE(moved0);
EXPECT_EQ(&foo, moved0.get());
// Move constructor, adding const qualifier.
weak_ptr = factory.GetWeakPtr();
WeakPtr<const SomeSubclass> moved1 = std::move(weak_ptr);
EXPECT_FALSE(weak_ptr); // Original becomes null.
EXPECT_TRUE(moved1);
EXPECT_EQ(&foo, moved1.get());
// Normal move assignment.
weak_ptr = factory.GetWeakPtr();
WeakPtr<SomeSubclass> assigned0;
EXPECT_FALSE(assigned0);
assigned0 = std::move(weak_ptr);
EXPECT_FALSE(weak_ptr); // Original becomes null.
EXPECT_TRUE(assigned0);
EXPECT_EQ(&foo, assigned0.get());
// Move assignment, adding const qualifier.
weak_ptr = factory.GetWeakPtr();
WeakPtr<const SomeSubclass> assigned1;
EXPECT_FALSE(assigned1);
assigned1 = std::move(weak_ptr);
EXPECT_FALSE(weak_ptr); // Original becomes null.
EXPECT_TRUE(assigned1);
EXPECT_EQ(&foo, assigned1.get());
// Upcast move constructor.
weak_ptr = factory.GetWeakPtr();
WeakPtr<SomeClass> moved2 = std::move(weak_ptr);
EXPECT_FALSE(weak_ptr); // Original becomes null.
EXPECT_TRUE(moved2);
EXPECT_EQ(&foo, moved2.get());
EXPECT_EQ(999, (*moved2).GetValue()); // Result from subclass's GetValue().
EXPECT_EQ(999, moved2->GetValue()); // Result from subclass's GetValue().
// Upcast move assignment.
weak_ptr = factory.GetWeakPtr();
WeakPtr<SomeClass> assigned2;
EXPECT_FALSE(assigned2);
assigned2 = std::move(weak_ptr);
EXPECT_FALSE(weak_ptr); // Original becomes null.
EXPECT_TRUE(assigned2);
EXPECT_EQ(&foo, assigned2.get());
EXPECT_EQ(999,
(*assigned2).GetValue()); // Result from subclass's GetValue().
EXPECT_EQ(999, assigned2->GetValue()); // Result from subclass's GetValue().
}
TEST(WeakPtrTest, InvalidatesWeakPtrs) {
const int foo = 1337;
WeakPtrFactory<const int> factory(&foo);
// Thrice: Create weak pointers and invalidate them. This is done more than
// once to confirm the factory can create valid WeakPtrs again after each
// InvalidateWeakPtrs() call.
for (int i = 0; i < 3; ++i) {
// Create three WeakPtrs, two from the factory, one as a copy of another
// WeakPtr.
WeakPtr<const int> ptr0 = factory.GetWeakPtr();
WeakPtr<const int> ptr1 = factory.GetWeakPtr();
WeakPtr<const int> ptr2 = ptr1;
EXPECT_EQ(&foo, ptr0.get());
EXPECT_EQ(&foo, ptr1.get());
EXPECT_EQ(&foo, ptr2.get());
// Invalidate all outstanding WeakPtrs from the factory, and confirm all
// outstanding WeakPtrs become null.
factory.InvalidateWeakPtrs();
EXPECT_FALSE(ptr0);
EXPECT_FALSE(ptr1);
EXPECT_FALSE(ptr2);
}
}
} // namespace
} // namespace openscreen
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