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// Copyright 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 "skia/ext/refptr.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace skia {
namespace {
TEST(RefPtrTest, ReferenceCounting) {
SkRefCnt* ref = new SkRefCnt();
EXPECT_EQ(1, ref->getRefCnt());
{
// Adopt the reference from the caller on creation.
RefPtr<SkRefCnt> refptr1 = AdoptRef(ref);
EXPECT_EQ(1, ref->getRefCnt());
EXPECT_EQ(1, refptr1->getRefCnt());
EXPECT_EQ(ref, &*refptr1);
EXPECT_EQ(ref, refptr1.get());
{
// Take a second reference for the second instance.
RefPtr<SkRefCnt> refptr2(refptr1);
EXPECT_EQ(2, ref->getRefCnt());
RefPtr<SkRefCnt> refptr3;
EXPECT_FALSE(refptr3);
// Take a third reference for the third instance.
refptr3 = refptr1;
EXPECT_EQ(3, ref->getRefCnt());
// Same object, so should have the same refcount.
refptr2 = refptr3;
EXPECT_EQ(3, ref->getRefCnt());
// Drop the object from refptr2, so it should lose its reference.
EXPECT_TRUE(refptr2);
refptr2.clear();
EXPECT_EQ(2, ref->getRefCnt());
EXPECT_FALSE(refptr2);
EXPECT_EQ(NULL, refptr2.get());
EXPECT_TRUE(refptr3);
EXPECT_EQ(2, refptr3->getRefCnt());
EXPECT_EQ(ref, &*refptr3);
EXPECT_EQ(ref, refptr3.get());
}
// Drop a reference when the third object is destroyed.
EXPECT_EQ(1, ref->getRefCnt());
}
}
TEST(RefPtrTest, Construct) {
SkRefCnt* ref = new SkRefCnt();
EXPECT_EQ(1, ref->getRefCnt());
// Adopt the reference from the caller on creation.
RefPtr<SkRefCnt> refptr1(AdoptRef(ref));
EXPECT_EQ(1, ref->getRefCnt());
EXPECT_EQ(1, refptr1->getRefCnt());
EXPECT_EQ(ref, &*refptr1);
EXPECT_EQ(ref, refptr1.get());
RefPtr<SkRefCnt> refptr2(refptr1);
EXPECT_EQ(2, ref->getRefCnt());
}
TEST(RefPtrTest, DeclareAndAssign) {
SkRefCnt* ref = new SkRefCnt();
EXPECT_EQ(1, ref->getRefCnt());
// Adopt the reference from the caller on creation.
RefPtr<SkRefCnt> refptr1 = AdoptRef(ref);
EXPECT_EQ(1, ref->getRefCnt());
EXPECT_EQ(1, refptr1->getRefCnt());
EXPECT_EQ(ref, &*refptr1);
EXPECT_EQ(ref, refptr1.get());
RefPtr<SkRefCnt> refptr2 = refptr1;
EXPECT_EQ(2, ref->getRefCnt());
}
TEST(RefPtrTest, Assign) {
SkRefCnt* ref = new SkRefCnt();
EXPECT_EQ(1, ref->getRefCnt());
// Adopt the reference from the caller on creation.
RefPtr<SkRefCnt> refptr1;
refptr1 = AdoptRef(ref);
EXPECT_EQ(1, ref->getRefCnt());
EXPECT_EQ(1, refptr1->getRefCnt());
EXPECT_EQ(ref, &*refptr1);
EXPECT_EQ(ref, refptr1.get());
RefPtr<SkRefCnt> refptr2;
refptr2 = refptr1;
EXPECT_EQ(2, ref->getRefCnt());
}
class Subclass : public SkRefCnt {};
TEST(RefPtrTest, Upcast) {
RefPtr<Subclass> child = AdoptRef(new Subclass());
EXPECT_EQ(1, child->getRefCnt());
RefPtr<SkRefCnt> parent = child;
EXPECT_TRUE(child);
EXPECT_TRUE(parent);
EXPECT_EQ(2, child->getRefCnt());
EXPECT_EQ(2, parent->getRefCnt());
}
} // namespace
} // namespace skia
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