scoped_generic_unittest.cc 3.9 KB
Newer Older
brettw@chromium.org's avatar
brettw@chromium.org committed
1 2 3 4
// Copyright 2014 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.

5 6 7
#include "base/scoped_generic.h"

#include <utility>
brettw@chromium.org's avatar
brettw@chromium.org committed
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89
#include <vector>

#include "testing/gtest/include/gtest/gtest.h"

namespace base {

namespace {

struct IntTraits {
  IntTraits(std::vector<int>* freed) : freed_ints(freed) {}

  static int InvalidValue() {
    return -1;
  }
  void Free(int value) {
    freed_ints->push_back(value);
  }

  std::vector<int>* freed_ints;
};

typedef ScopedGeneric<int, IntTraits> ScopedInt;

}  // namespace

TEST(ScopedGenericTest, ScopedGeneric) {
  std::vector<int> values_freed;
  IntTraits traits(&values_freed);

  // Invalid case, delete should not be called.
  {
    ScopedInt a(IntTraits::InvalidValue(), traits);
  }
  EXPECT_TRUE(values_freed.empty());

  // Simple deleting case.
  static const int kFirst = 0;
  {
    ScopedInt a(kFirst, traits);
  }
  ASSERT_EQ(1u, values_freed.size());
  ASSERT_EQ(kFirst, values_freed[0]);
  values_freed.clear();

  // Release should return the right value and leave the object empty.
  {
    ScopedInt a(kFirst, traits);
    EXPECT_EQ(kFirst, a.release());

    ScopedInt b(IntTraits::InvalidValue(), traits);
    EXPECT_EQ(IntTraits::InvalidValue(), b.release());
  }
  ASSERT_TRUE(values_freed.empty());

  // Reset should free the old value, then the new one should go away when
  // it goes out of scope.
  static const int kSecond = 1;
  {
    ScopedInt b(kFirst, traits);
    b.reset(kSecond);
    ASSERT_EQ(1u, values_freed.size());
    ASSERT_EQ(kFirst, values_freed[0]);
  }
  ASSERT_EQ(2u, values_freed.size());
  ASSERT_EQ(kSecond, values_freed[1]);
  values_freed.clear();

  // Swap.
  {
    ScopedInt a(kFirst, traits);
    ScopedInt b(kSecond, traits);
    a.swap(b);
    EXPECT_TRUE(values_freed.empty());  // Nothing should be freed.
    EXPECT_EQ(kSecond, a.get());
    EXPECT_EQ(kFirst, b.get());
  }
  // Values should be deleted in the opposite order.
  ASSERT_EQ(2u, values_freed.size());
  EXPECT_EQ(kFirst, values_freed[0]);
  EXPECT_EQ(kSecond, values_freed[1]);
  values_freed.clear();

90
  // Move constructor.
brettw@chromium.org's avatar
brettw@chromium.org committed
91 92
  {
    ScopedInt a(kFirst, traits);
93
    ScopedInt b(std::move(a));
brettw@chromium.org's avatar
brettw@chromium.org committed
94 95 96 97
    EXPECT_TRUE(values_freed.empty());  // Nothing should be freed.
    ASSERT_EQ(IntTraits::InvalidValue(), a.get());
    ASSERT_EQ(kFirst, b.get());
  }
98

brettw@chromium.org's avatar
brettw@chromium.org committed
99 100
  ASSERT_EQ(1u, values_freed.size());
  ASSERT_EQ(kFirst, values_freed[0]);
101 102
  values_freed.clear();

103
  // Move assign.
104 105 106
  {
    ScopedInt a(kFirst, traits);
    ScopedInt b(kSecond, traits);
107
    b = std::move(a);
108 109 110 111 112 113 114 115 116
    ASSERT_EQ(1u, values_freed.size());
    EXPECT_EQ(kSecond, values_freed[0]);
    ASSERT_EQ(IntTraits::InvalidValue(), a.get());
    ASSERT_EQ(kFirst, b.get());
  }

  ASSERT_EQ(2u, values_freed.size());
  EXPECT_EQ(kFirst, values_freed[1]);
  values_freed.clear();
brettw@chromium.org's avatar
brettw@chromium.org committed
117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
}

TEST(ScopedGenericTest, Operators) {
  std::vector<int> values_freed;
  IntTraits traits(&values_freed);

  static const int kFirst = 0;
  static const int kSecond = 1;
  {
    ScopedInt a(kFirst, traits);
    EXPECT_TRUE(a == kFirst);
    EXPECT_FALSE(a != kFirst);
    EXPECT_FALSE(a == kSecond);
    EXPECT_TRUE(a != kSecond);

    EXPECT_TRUE(kFirst == a);
    EXPECT_FALSE(kFirst != a);
    EXPECT_FALSE(kSecond == a);
    EXPECT_TRUE(kSecond != a);
  }

  // is_valid().
  {
    ScopedInt a(kFirst, traits);
    EXPECT_TRUE(a.is_valid());
    a.reset();
    EXPECT_FALSE(a.is_valid());
  }
}

// Cheesy manual "no compile" test for manually validating changes.
#if 0
TEST(ScopedGenericTest, NoCompile) {
  // Assignment shouldn't work.
  /*{
    ScopedInt a(kFirst, traits);
    ScopedInt b(a);
  }*/

  // Comparison shouldn't work.
  /*{
    ScopedInt a(kFirst, traits);
    ScopedInt b(kFirst, traits);
    if (a == b) {
    }
  }*/

  // Implicit conversion to bool shouldn't work.
  /*{
    ScopedInt a(kFirst, traits);
    bool result = a;
  }*/
}
#endif

}  // namespace base