Rework CFX_CountRef in terms of CFX_RetainPtr

core/fxcrt/cfx_count_ref_unittest.cpp

+// Copyright 2016 PDFium 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 "core/fxcrt/include/cfx_count_ref.h"
+
+#include <map>
+#include <string>
+
+#include "testing/fx_string_testhelpers.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+class Observer {
+ public:
+  void OnConstruct(const std::string& name) { construction_counts_[name]++; }
+  void OnDestruct(const std::string& name) { destruction_counts_[name]++; }
+  int GetConstructionCount(const std::string& name) {
+    return construction_counts_[name];
+  }
+  int GetDestructionCount(const std::string& name) {
+    return destruction_counts_[name];
+  }
+
+ private:
+  std::map<std::string, int> construction_counts_;
+  std::map<std::string, int> destruction_counts_;
+};
+
+class Object {
+ public:
+  Object(Observer* observer, const std::string& name)
+      : name_(name), observer_(observer) {
+    observer->OnConstruct(name_);
+  }
+  Object(const Object& that) : name_(that.name_), observer_(that.observer_) {
+    observer_->OnConstruct(name_);
+  }
+  ~Object() { observer_->OnDestruct(name_); }
+
+ private:
+  std::string name_;
+  Observer* observer_;
+};
+
+}  // namespace
+
+TEST(fxcrt, CountRefNull) {
+  Observer observer;
+  {
+    CFX_CountRef<Object> ptr;
+    EXPECT_EQ(nullptr, ptr.GetObject());
+  }
+}
+
+TEST(fxcrt, CountRefCopy) {
+  Observer observer;
+  {
+    CFX_CountRef<Object> ptr1;
+    ptr1.New(&observer, std::string("one"));
+    {
+      CFX_CountRef<Object> ptr2 = ptr1;
+      EXPECT_EQ(1, observer.GetConstructionCount("one"));
+      EXPECT_EQ(0, observer.GetDestructionCount("one"));
+    }
+    {
+      CFX_CountRef<Object> ptr3(ptr1);
+      EXPECT_EQ(1, observer.GetConstructionCount("one"));
+      EXPECT_EQ(0, observer.GetDestructionCount("one"));
+    }
+    EXPECT_EQ(1, observer.GetConstructionCount("one"));
+    EXPECT_EQ(0, observer.GetDestructionCount("one"));
+  }
+  EXPECT_EQ(1, observer.GetDestructionCount("one"));
+}
+
+TEST(fxcrt, CountRefAssignOverOld) {
+  Observer observer;
+  {
+    CFX_CountRef<Object> ptr1;
+    ptr1.New(&observer, std::string("one"));
+    ptr1.New(&observer, std::string("two"));
+    EXPECT_EQ(1, observer.GetConstructionCount("one"));
+    EXPECT_EQ(1, observer.GetConstructionCount("two"));
+    EXPECT_EQ(1, observer.GetDestructionCount("one"));
+    EXPECT_EQ(0, observer.GetDestructionCount("two"));
+  }
+  EXPECT_EQ(1, observer.GetDestructionCount("two"));
+}
+
+TEST(fxcrt, CountRefAssignOverRetained) {
+  Observer observer;
+  {
+    CFX_CountRef<Object> ptr1;
+    ptr1.New(&observer, std::string("one"));
+    CFX_CountRef<Object> ptr2(ptr1);
+    ptr1.New(&observer, std::string("two"));
+    EXPECT_EQ(1, observer.GetConstructionCount("one"));
+    EXPECT_EQ(1, observer.GetConstructionCount("two"));
+    EXPECT_EQ(0, observer.GetDestructionCount("one"));
+    EXPECT_EQ(0, observer.GetDestructionCount("two"));
+  }
+  EXPECT_EQ(1, observer.GetDestructionCount("one"));
+  EXPECT_EQ(1, observer.GetDestructionCount("two"));
+}
+
+TEST(fxcrt, CountRefGetModify) {
+  Observer observer;
+  {
+    CFX_CountRef<Object> ptr;
+    EXPECT_NE(nullptr, ptr.GetModify(&observer, std::string("one")));
+    EXPECT_EQ(1, observer.GetConstructionCount("one"));
+    EXPECT_EQ(0, observer.GetDestructionCount("one"));
+
+    EXPECT_NE(nullptr, ptr.GetModify(&observer, std::string("one")));
+    EXPECT_EQ(1, observer.GetConstructionCount("one"));
+    EXPECT_EQ(0, observer.GetDestructionCount("one"));
+    {
+      CFX_CountRef<Object> other(ptr);
+      EXPECT_NE(nullptr, ptr.GetModify(&observer, std::string("one")));
+      EXPECT_EQ(2, observer.GetConstructionCount("one"));
+      EXPECT_EQ(0, observer.GetDestructionCount("one"));
+    }
+    EXPECT_EQ(2, observer.GetConstructionCount("one"));
+    EXPECT_EQ(1, observer.GetDestructionCount("one"));
+  }
+  EXPECT_EQ(2, observer.GetDestructionCount("one"));
+}