googletest/test/googletest-linked-ptr-test.cc

// Copyright 2003, Google Inc.
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#include <stdlib.h>

#include "gtest/internal/gtest-linked_ptr.h"
#include "gtest/gtest.h"

namespace {

using testing::Message;
using testing::internal::linked_ptr;

int num;
Message* history = NULL;

// Class which tracks allocation/deallocation
class A {
 public:
  A(): mynum(num++) { *history << "A" << mynum << " ctor\n"; }
  virtual ~A() { *history << "A" << mynum << " dtor\n"; }
  virtual void Use() { *history << "A" << mynum << " use\n"; }
 protected:
  int mynum;
};

// Subclass
class B : public A {
 public:
  B() { *history << "B" << mynum << " ctor\n"; }
  ~B() { *history << "B" << mynum << " dtor\n"; }
  virtual void Use() { *history << "B" << mynum << " use\n"; }
};

class LinkedPtrTest : public testing::Test {
 public:
  LinkedPtrTest() {
    num = 0;
    history = new Message;
  }

  virtual ~LinkedPtrTest() {
    delete history;
    history = NULL;
  }
};

TEST_F(LinkedPtrTest, GeneralTest) {
  {
    linked_ptr<A> a0, a1, a2;
    // Use explicit function call notation here to suppress self-assign warning.
    a0.operator=(a0);
    a1 = a2;
    ASSERT_EQ(a0.get(), static_cast<A*>(NULL));
    ASSERT_EQ(a1.get(), static_cast<A*>(NULL));
    ASSERT_EQ(a2.get(), static_cast<A*>(NULL));
    ASSERT_TRUE(a0 == NULL);
    ASSERT_TRUE(a1 == NULL);
    ASSERT_TRUE(a2 == NULL);

    {
      linked_ptr<A> a3(new A);
      a0 = a3;
      ASSERT_TRUE(a0 == a3);
      ASSERT_TRUE(a0 != NULL);
      ASSERT_TRUE(a0.get() == a3);
      ASSERT_TRUE(a0 == a3.get());
      linked_ptr<A> a4(a0);
      a1 = a4;
      linked_ptr<A> a5(new A);
      ASSERT_TRUE(a5.get() != a3);
      ASSERT_TRUE(a5 != a3.get());
      a2 = a5;
      linked_ptr<B> b0(new B);
      linked_ptr<A> a6(b0);
      ASSERT_TRUE(b0 == a6);
      ASSERT_TRUE(a6 == b0);
      ASSERT_TRUE(b0 != NULL);
      a5 = b0;
      a5 = b0;
      a3->Use();
      a4->Use();
      a5->Use();
      a6->Use();
      b0->Use();
      (*b0).Use();
      b0.get()->Use();
    }

    a0->Use();
    a1->Use();
    a2->Use();

    a1 = a2;
    a2.reset(new A);
    a0.reset();

    linked_ptr<A> a7;
  }

  ASSERT_STREQ(
    "A0 ctor\n"
    "A1 ctor\n"
    "A2 ctor\n"
    "B2 ctor\n"
    "A0 use\n"
    "A0 use\n"
    "B2 use\n"
    "B2 use\n"
    "B2 use\n"
    "B2 use\n"
    "B2 use\n"
    "B2 dtor\n"
    "A2 dtor\n"
    "A0 use\n"
    "A0 use\n"
    "A1 use\n"
    "A3 ctor\n"
    "A0 dtor\n"
    "A3 dtor\n"
    "A1 dtor\n",
    history->GetString().c_str());
}

}  // Unnamed namespace