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/*
* Copyright 2019 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "api/scoped_refptr.h"
#include <type_traits>
#include <utility>
#include <vector>
#include "test/gtest.h"
namespace rtc {
namespace {
struct FunctionsCalled {
int addref = 0;
int release = 0;
};
class ScopedRefCounted {
public:
explicit ScopedRefCounted(FunctionsCalled* called) : called_(*called) {}
ScopedRefCounted(const ScopedRefCounted&) = delete;
ScopedRefCounted& operator=(const ScopedRefCounted&) = delete;
void AddRef() {
++called_.addref;
++ref_count_;
}
void Release() {
++called_.release;
if (0 == --ref_count_)
delete this;
}
private:
~ScopedRefCounted() = default;
FunctionsCalled& called_;
int ref_count_ = 0;
};
TEST(ScopedRefptrTest, IsCopyConstructable) {
FunctionsCalled called;
scoped_refptr<ScopedRefCounted> ptr(new ScopedRefCounted(&called));
scoped_refptr<ScopedRefCounted> another_ptr = ptr;
EXPECT_TRUE(ptr);
EXPECT_TRUE(another_ptr);
EXPECT_EQ(called.addref, 2);
}
TEST(ScopedRefptrTest, IsCopyAssignable) {
FunctionsCalled called;
scoped_refptr<ScopedRefCounted> another_ptr;
scoped_refptr<ScopedRefCounted> ptr(new ScopedRefCounted(&called));
another_ptr = ptr;
EXPECT_TRUE(ptr);
EXPECT_TRUE(another_ptr);
EXPECT_EQ(called.addref, 2);
}
TEST(ScopedRefptrTest, IsMoveConstructableWithoutExtraAddRefRelease) {
FunctionsCalled called;
scoped_refptr<ScopedRefCounted> ptr(new ScopedRefCounted(&called));
scoped_refptr<ScopedRefCounted> another_ptr = std::move(ptr);
EXPECT_FALSE(ptr);
EXPECT_TRUE(another_ptr);
EXPECT_EQ(called.addref, 1);
EXPECT_EQ(called.release, 0);
}
TEST(ScopedRefptrTest, IsMoveAssignableWithoutExtraAddRefRelease) {
FunctionsCalled called;
scoped_refptr<ScopedRefCounted> another_ptr;
scoped_refptr<ScopedRefCounted> ptr(new ScopedRefCounted(&called));
another_ptr = std::move(ptr);
EXPECT_FALSE(ptr);
EXPECT_TRUE(another_ptr);
EXPECT_EQ(called.addref, 1);
EXPECT_EQ(called.release, 0);
}
TEST(ScopedRefptrTest, MovableDuringVectorReallocation) {
static_assert(
std::is_nothrow_move_constructible<scoped_refptr<ScopedRefCounted>>(),
"");
// Test below describes a scenario where it is helpful for move constructor
// to be noexcept.
FunctionsCalled called;
std::vector<scoped_refptr<ScopedRefCounted>> ptrs;
ptrs.reserve(1);
// Insert more elements than reserved to provoke reallocation.
ptrs.emplace_back(new ScopedRefCounted(&called));
ptrs.emplace_back(new ScopedRefCounted(&called));
EXPECT_EQ(called.addref, 2);
EXPECT_EQ(called.release, 0);
}
} // namespace
} // namespace rtc