base/memory/linked_ptr_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <string>
   6
   7 #include "base/memory/linked_ptr.h"
   8 #include "base/strings/stringprintf.h"
   9 #include "testing/gtest/include/gtest/gtest.h"
  10
  11 namespace {
  12
  13 int num = 0;
  14
  15 std::string history;
  16
  17 // Class which tracks allocation/deallocation
  18 struct A {
  19   A(): mynum(num++) { history += base::StringPrintf("A%d ctor\n", mynum); }
  20   virtual ~A() { history += base::StringPrintf("A%d dtor\n", mynum); }
  21   virtual void Use() { history += base::StringPrintf("A%d use\n", mynum); }
  22   int mynum;
  23 };
  24
  25 // Subclass
  26 struct B: public A {
  27   B() { history += base::StringPrintf("B%d ctor\n", mynum); }
  28   ~B() override { history += base::StringPrintf("B%d dtor\n", mynum); }
  29   void Use() override { history += base::StringPrintf("B%d use\n", mynum); }
  30 };
  31
  32 }  // namespace
  33
  34 TEST(LinkedPtrTest, Test) {
  35   {
  36     linked_ptr<A> a0, a1, a2;
  37     a0 = a0;
  38     a1 = a2;
  39     ASSERT_EQ(a0.get(), static_cast<A*>(NULL));
  40     ASSERT_EQ(a1.get(), static_cast<A*>(NULL));
  41     ASSERT_EQ(a2.get(), static_cast<A*>(NULL));
  42     ASSERT_TRUE(a0 == NULL);
  43     ASSERT_TRUE(a1 == NULL);
  44     ASSERT_TRUE(a2 == NULL);
  45
  46     {
  47       linked_ptr<A> a3(new A);
  48       a0 = a3;
  49       ASSERT_TRUE(a0 == a3);
  50       ASSERT_TRUE(a0 != NULL);
  51       ASSERT_TRUE(a0.get() == a3);
  52       ASSERT_TRUE(a0 == a3.get());
  53       linked_ptr<A> a4(a0);
  54       a1 = a4;
  55       linked_ptr<A> a5(new A);
  56       ASSERT_TRUE(a5.get() != a3);
  57       ASSERT_TRUE(a5 != a3.get());
  58       a2 = a5;
  59       linked_ptr<B> b0(new B);
  60       linked_ptr<A> a6(b0);
  61       ASSERT_TRUE(b0 == a6);
  62       ASSERT_TRUE(a6 == b0);
  63       ASSERT_TRUE(b0 != NULL);
  64       a5 = b0;
  65       a5 = b0;
  66       a3->Use();
  67       a4->Use();
  68       a5->Use();
  69       a6->Use();
  70       b0->Use();
  71       (*b0).Use();
  72       b0.get()->Use();
  73     }
  74
  75     a0->Use();
  76     a1->Use();
  77     a2->Use();
  78
  79     a1 = a2;
  80     a2.reset(new A);
  81     a0.reset();
  82
  83     linked_ptr<A> a7;
  84   }
  85
  86   ASSERT_EQ(history,
  87     "A0 ctor\n"
  88     "A1 ctor\n"
  89     "A2 ctor\n"
  90     "B2 ctor\n"
  91     "A0 use\n"
  92     "A0 use\n"
  93     "B2 use\n"
  94     "B2 use\n"
  95     "B2 use\n"
  96     "B2 use\n"
  97     "B2 use\n"
  98     "B2 dtor\n"
  99     "A2 dtor\n"
 100     "A0 use\n"
 101     "A0 use\n"
 102     "A1 use\n"
 103     "A3 ctor\n"
 104     "A0 dtor\n"
 105     "A3 dtor\n"
 106     "A1 dtor\n"
 107   );
 108 }