tor-browser

The Tor Browser
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TestReverseIterator.cpp (2802B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "gtest/gtest.h"
      8 
      9 #include "mozilla/ReverseIterator.h"
     10 
     11 using namespace mozilla;
     12 
     13 TEST(ReverseIterator, Const_RangeBasedFor)
     14 {
     15  const std::vector<int> in = {1, 2, 3, 4};
     16  const auto reversedRange =
     17      detail::IteratorRange<ReverseIterator<std::vector<int>::const_iterator>>{
     18          ReverseIterator{in.end()}, ReverseIterator{in.begin()}};
     19 
     20  const std::vector<int> expected = {4, 3, 2, 1};
     21  std::vector<int> out;
     22  for (auto i : reversedRange) {
     23    out.emplace_back(i);
     24  }
     25 
     26  EXPECT_EQ(expected, out);
     27 }
     28 
     29 TEST(ReverseIterator, NonConst_RangeBasedFor)
     30 {
     31  std::vector<int> in = {1, 2, 3, 4};
     32  auto reversedRange =
     33      detail::IteratorRange<ReverseIterator<std::vector<int>::iterator>>{
     34          ReverseIterator{in.end()}, ReverseIterator{in.begin()}};
     35 
     36  const std::vector<int> expected = {-1, -2, -3, -4};
     37  for (auto& i : reversedRange) {
     38    i = -i;
     39  }
     40 
     41  EXPECT_EQ(expected, in);
     42 }
     43 
     44 TEST(ReverseIterator, Difference)
     45 {
     46  const std::vector<int> in = {1, 2, 3, 4};
     47  using reverse_iterator = ReverseIterator<std::vector<int>::const_iterator>;
     48 
     49  reverse_iterator rbegin = reverse_iterator{in.end()},
     50                   rend = reverse_iterator{in.begin()};
     51  EXPECT_EQ(4, rend - rbegin);
     52  EXPECT_EQ(0, rend - rend);
     53  EXPECT_EQ(0, rbegin - rbegin);
     54 
     55  --rend;
     56  EXPECT_EQ(3, rend - rbegin);
     57 
     58  ++rbegin;
     59  EXPECT_EQ(2, rend - rbegin);
     60 
     61  rend--;
     62  EXPECT_EQ(1, rend - rbegin);
     63 
     64  rbegin++;
     65  EXPECT_EQ(0, rend - rbegin);
     66 }
     67 
     68 TEST(ReverseIterator, Comparison)
     69 {
     70  const std::vector<int> in = {1, 2, 3, 4};
     71  using reverse_iterator = ReverseIterator<std::vector<int>::const_iterator>;
     72 
     73  reverse_iterator rbegin = reverse_iterator{in.end()},
     74                   rend = reverse_iterator{in.begin()};
     75  EXPECT_TRUE(rbegin < rend);
     76  EXPECT_FALSE(rend < rbegin);
     77  EXPECT_FALSE(rend < rend);
     78  EXPECT_FALSE(rbegin < rbegin);
     79 
     80  EXPECT_TRUE(rend > rbegin);
     81  EXPECT_FALSE(rbegin > rend);
     82  EXPECT_FALSE(rend > rend);
     83  EXPECT_FALSE(rbegin > rbegin);
     84 
     85  EXPECT_TRUE(rbegin <= rend);
     86  EXPECT_FALSE(rend <= rbegin);
     87  EXPECT_TRUE(rend <= rend);
     88  EXPECT_TRUE(rbegin <= rbegin);
     89 
     90  EXPECT_TRUE(rend >= rbegin);
     91  EXPECT_FALSE(rbegin >= rend);
     92  EXPECT_TRUE(rend >= rend);
     93  EXPECT_TRUE(rbegin >= rbegin);
     94 
     95  EXPECT_FALSE(rend == rbegin);
     96  EXPECT_FALSE(rbegin == rend);
     97  EXPECT_TRUE(rend == rend);
     98  EXPECT_TRUE(rbegin == rbegin);
     99 
    100  EXPECT_TRUE(rend != rbegin);
    101  EXPECT_TRUE(rbegin != rend);
    102  EXPECT_FALSE(rend != rend);
    103  EXPECT_FALSE(rbegin != rbegin);
    104 }