unittests/ADT/OptionalTest.cpp

   1 //===- llvm/unittest/ADT/OptionalTest.cpp - Optional unit tests -----------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "gtest/gtest.h"
  11 #include "llvm/ADT/Optional.h"
  12 using namespace llvm;
  13
  14 namespace {
  15
  16 struct NonDefaultConstructible {
  17   static unsigned CopyConstructions;
  18   static unsigned Destructions;
  19   static unsigned CopyAssignments;
  20   explicit NonDefaultConstructible(int) {
  21   }
  22   NonDefaultConstructible(const NonDefaultConstructible&) {
  23     ++CopyConstructions;
  24   }
  25   NonDefaultConstructible &operator=(const NonDefaultConstructible&) {
  26     ++CopyAssignments;
  27     return *this;
  28   }
  29   ~NonDefaultConstructible() {
  30     ++Destructions;
  31   }
  32   static void ResetCounts() {
  33     CopyConstructions = 0;
  34     Destructions = 0;
  35     CopyAssignments = 0;
  36   }
  37 };
  38
  39 unsigned NonDefaultConstructible::CopyConstructions = 0;
  40 unsigned NonDefaultConstructible::Destructions = 0;
  41 unsigned NonDefaultConstructible::CopyAssignments = 0;
  42
  43 // Test fixture
  44 class OptionalTest : public testing::Test {
  45 };
  46
  47 TEST_F(OptionalTest, NonDefaultConstructibleTest) {
  48   Optional<NonDefaultConstructible> O;
  49   EXPECT_FALSE(O);
  50 }
  51
  52 TEST_F(OptionalTest, ResetTest) {
  53   NonDefaultConstructible::ResetCounts();
  54   Optional<NonDefaultConstructible> O(NonDefaultConstructible(3));
  55   EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
  56   EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
  57   EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
  58   NonDefaultConstructible::ResetCounts();
  59   O.reset();
  60   EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
  61   EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
  62   EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
  63 }
  64
  65 TEST_F(OptionalTest, InitializationLeakTest) {
  66   NonDefaultConstructible::ResetCounts();
  67   Optional<NonDefaultConstructible>(NonDefaultConstructible(3));
  68   EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
  69   EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
  70   EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
  71 }
  72
  73 TEST_F(OptionalTest, CopyConstructionTest) {
  74   NonDefaultConstructible::ResetCounts();
  75   {
  76     Optional<NonDefaultConstructible> A(NonDefaultConstructible(3));
  77     EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
  78     EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
  79     EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
  80     NonDefaultConstructible::ResetCounts();
  81     Optional<NonDefaultConstructible> B(A);
  82     EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
  83     EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
  84     EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
  85     NonDefaultConstructible::ResetCounts();
  86   }
  87   EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
  88   EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
  89   EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
  90 }
  91
  92 TEST_F(OptionalTest, ConstructingCopyAssignmentTest) {
  93   NonDefaultConstructible::ResetCounts();
  94   {
  95     Optional<NonDefaultConstructible> A(NonDefaultConstructible(3));
  96     Optional<NonDefaultConstructible> B;
  97     EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
  98     EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
  99     EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
 100     NonDefaultConstructible::ResetCounts();
 101     B = A;
 102     EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
 103     EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
 104     EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
 105     NonDefaultConstructible::ResetCounts();
 106   }
 107   EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
 108   EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
 109   EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
 110 }
 111
 112 TEST_F(OptionalTest, CopyingCopyAssignmentTest) {
 113   NonDefaultConstructible::ResetCounts();
 114   {
 115     Optional<NonDefaultConstructible> A(NonDefaultConstructible(3));
 116     Optional<NonDefaultConstructible> B(NonDefaultConstructible(4));
 117     EXPECT_EQ(2u, NonDefaultConstructible::CopyConstructions);
 118     EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
 119     EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
 120     NonDefaultConstructible::ResetCounts();
 121     B = A;
 122     EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
 123     EXPECT_EQ(1u, NonDefaultConstructible::CopyAssignments);
 124     EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
 125     NonDefaultConstructible::ResetCounts();
 126   }
 127   EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
 128   EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
 129   EXPECT_EQ(2u, NonDefaultConstructible::Destructions);
 130 }
 131
 132 TEST_F(OptionalTest, DeletingCopyAssignmentTest) {
 133   NonDefaultConstructible::ResetCounts();
 134   {
 135     Optional<NonDefaultConstructible> A;
 136     Optional<NonDefaultConstructible> B(NonDefaultConstructible(3));
 137     EXPECT_EQ(1u, NonDefaultConstructible::CopyConstructions);
 138     EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
 139     EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
 140     NonDefaultConstructible::ResetCounts();
 141     B = A;
 142     EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
 143     EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
 144     EXPECT_EQ(1u, NonDefaultConstructible::Destructions);
 145     NonDefaultConstructible::ResetCounts();
 146   }
 147   EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
 148   EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
 149   EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
 150 }
 151
 152 TEST_F(OptionalTest, NullCopyConstructionTest) {
 153   NonDefaultConstructible::ResetCounts();
 154   {
 155     Optional<NonDefaultConstructible> A;
 156     Optional<NonDefaultConstructible> B;
 157     EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
 158     EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
 159     EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
 160     NonDefaultConstructible::ResetCounts();
 161     B = A;
 162     EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
 163     EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
 164     EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
 165     NonDefaultConstructible::ResetCounts();
 166   }
 167   EXPECT_EQ(0u, NonDefaultConstructible::CopyConstructions);
 168   EXPECT_EQ(0u, NonDefaultConstructible::CopyAssignments);
 169   EXPECT_EQ(0u, NonDefaultConstructible::Destructions);
 170 }
 171
 172 struct MoveOnly {
 173   static unsigned MoveConstructions;
 174   static unsigned Destructions;
 175   static unsigned MoveAssignments;
 176   int val;
 177   explicit MoveOnly(int val) : val(val) {
 178   }
 179   MoveOnly(MoveOnly&& other) {
 180     val = other.val;
 181     ++MoveConstructions;
 182   }
 183   MoveOnly &operator=(MoveOnly&& other) {
 184     val = other.val;
 185     ++MoveAssignments;
 186     return *this;
 187   }
 188   ~MoveOnly() {
 189     ++Destructions;
 190   }
 191   static void ResetCounts() {
 192     MoveConstructions = 0;
 193     Destructions = 0;
 194     MoveAssignments = 0;
 195   }
 196 };
 197
 198 unsigned MoveOnly::MoveConstructions = 0;
 199 unsigned MoveOnly::Destructions = 0;
 200 unsigned MoveOnly::MoveAssignments = 0;
 201
 202 TEST_F(OptionalTest, MoveOnlyNull) {
 203   MoveOnly::ResetCounts();
 204   Optional<MoveOnly> O;
 205   EXPECT_EQ(0u, MoveOnly::MoveConstructions);
 206   EXPECT_EQ(0u, MoveOnly::MoveAssignments);
 207   EXPECT_EQ(0u, MoveOnly::Destructions);
 208 }
 209
 210 TEST_F(OptionalTest, MoveOnlyConstruction) {
 211   MoveOnly::ResetCounts();
 212   Optional<MoveOnly> O(MoveOnly(3));
 213   EXPECT_TRUE((bool)O);
 214   EXPECT_EQ(3, O->val);
 215   EXPECT_EQ(1u, MoveOnly::MoveConstructions);
 216   EXPECT_EQ(0u, MoveOnly::MoveAssignments);
 217   EXPECT_EQ(1u, MoveOnly::Destructions);
 218 }
 219
 220 TEST_F(OptionalTest, MoveOnlyMoveConstruction) {
 221   Optional<MoveOnly> A(MoveOnly(3));
 222   MoveOnly::ResetCounts();
 223   Optional<MoveOnly> B(std::move(A));
 224   EXPECT_FALSE((bool)A);
 225   EXPECT_TRUE((bool)B);
 226   EXPECT_EQ(3, B->val);
 227   EXPECT_EQ(1u, MoveOnly::MoveConstructions);
 228   EXPECT_EQ(0u, MoveOnly::MoveAssignments);
 229   EXPECT_EQ(1u, MoveOnly::Destructions);
 230 }
 231
 232 TEST_F(OptionalTest, MoveOnlyAssignment) {
 233   MoveOnly::ResetCounts();
 234   Optional<MoveOnly> O;
 235   O = MoveOnly(3);
 236   EXPECT_TRUE((bool)O);
 237   EXPECT_EQ(3, O->val);
 238   EXPECT_EQ(1u, MoveOnly::MoveConstructions);
 239   EXPECT_EQ(0u, MoveOnly::MoveAssignments);
 240   EXPECT_EQ(1u, MoveOnly::Destructions);
 241 }
 242
 243 TEST_F(OptionalTest, MoveOnlyInitializingAssignment) {
 244   Optional<MoveOnly> A(MoveOnly(3));
 245   Optional<MoveOnly> B;
 246   MoveOnly::ResetCounts();
 247   B = std::move(A);
 248   EXPECT_FALSE((bool)A);
 249   EXPECT_TRUE((bool)B);
 250   EXPECT_EQ(3, B->val);
 251   EXPECT_EQ(1u, MoveOnly::MoveConstructions);
 252   EXPECT_EQ(0u, MoveOnly::MoveAssignments);
 253   EXPECT_EQ(1u, MoveOnly::Destructions);
 254 }
 255
 256 TEST_F(OptionalTest, MoveOnlyNullingAssignment) {
 257   Optional<MoveOnly> A;
 258   Optional<MoveOnly> B(MoveOnly(3));
 259   MoveOnly::ResetCounts();
 260   B = std::move(A);
 261   EXPECT_FALSE((bool)A);
 262   EXPECT_FALSE((bool)B);
 263   EXPECT_EQ(0u, MoveOnly::MoveConstructions);
 264   EXPECT_EQ(0u, MoveOnly::MoveAssignments);
 265   EXPECT_EQ(1u, MoveOnly::Destructions);
 266 }
 267
 268 TEST_F(OptionalTest, MoveOnlyAssigningAssignment) {
 269   Optional<MoveOnly> A(MoveOnly(3));
 270   Optional<MoveOnly> B(MoveOnly(4));
 271   MoveOnly::ResetCounts();
 272   B = std::move(A);
 273   EXPECT_FALSE((bool)A);
 274   EXPECT_TRUE((bool)B);
 275   EXPECT_EQ(3, B->val);
 276   EXPECT_EQ(0u, MoveOnly::MoveConstructions);
 277   EXPECT_EQ(1u, MoveOnly::MoveAssignments);
 278   EXPECT_EQ(1u, MoveOnly::Destructions);
 279 }
 280
 281 } // end anonymous namespace
 282