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gtest-tuple_test.cc
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30 // Author: wan@google.com (Zhanyong Wan)
31 
32 #include "gtest/internal/gtest-tuple.h"
33 #include <utility>
34 #include "gtest/gtest.h"
35 
36 namespace {
37 
40 using ::std::tr1::tuple;
41 using ::std::tr1::tuple_element;
42 using ::std::tr1::tuple_size;
44 
45 // Tests that tuple_element<K, tuple<T0, T1, ..., TN> >::type returns TK.
46 TEST(tuple_element_Test, ReturnsElementType) {
47  StaticAssertTypeEq<int, tuple_element<0, tuple<int, char> >::type>();
48  StaticAssertTypeEq<int&, tuple_element<1, tuple<double, int&> >::type>();
49  StaticAssertTypeEq<bool, tuple_element<2, tuple<double, int, bool> >::type>();
50 }
51 
52 // Tests that tuple_size<T>::value gives the number of fields in tuple
53 // type T.
54 TEST(tuple_size_Test, ReturnsNumberOfFields) {
55  EXPECT_EQ(0, +tuple_size<tuple<> >::value);
56  EXPECT_EQ(1, +tuple_size<tuple<void*> >::value);
57  EXPECT_EQ(1, +tuple_size<tuple<char> >::value);
58  EXPECT_EQ(1, +(tuple_size<tuple<tuple<int, double> > >::value));
59  EXPECT_EQ(2, +(tuple_size<tuple<int&, const char> >::value));
60  EXPECT_EQ(3, +(tuple_size<tuple<char*, void, const bool&> >::value));
61 }
62 
63 // Tests comparing a tuple with itself.
64 TEST(ComparisonTest, ComparesWithSelf) {
65  const tuple<int, char, bool> a(5, 'a', false);
66 
67  EXPECT_TRUE(a == a);
68  EXPECT_FALSE(a != a);
69 }
70 
71 // Tests comparing two tuples with the same value.
72 TEST(ComparisonTest, ComparesEqualTuples) {
73  const tuple<int, bool> a(5, true), b(5, true);
74 
75  EXPECT_TRUE(a == b);
76  EXPECT_FALSE(a != b);
77 }
78 
79 // Tests comparing two different tuples that have no reference fields.
80 TEST(ComparisonTest, ComparesUnequalTuplesWithoutReferenceFields) {
81  typedef tuple<const int, char> FooTuple;
82 
83  const FooTuple a(0, 'x');
84  const FooTuple b(1, 'a');
85 
86  EXPECT_TRUE(a != b);
87  EXPECT_FALSE(a == b);
88 
89  const FooTuple c(1, 'b');
90 
91  EXPECT_TRUE(b != c);
92  EXPECT_FALSE(b == c);
93 }
94 
95 // Tests comparing two different tuples that have reference fields.
96 TEST(ComparisonTest, ComparesUnequalTuplesWithReferenceFields) {
97  typedef tuple<int&, const char&> FooTuple;
98 
99  int i = 5;
100  const char ch = 'a';
101  const FooTuple a(i, ch);
102 
103  int j = 6;
104  const FooTuple b(j, ch);
105 
106  EXPECT_TRUE(a != b);
107  EXPECT_FALSE(a == b);
108 
109  j = 5;
110  const char ch2 = 'b';
111  const FooTuple c(j, ch2);
112 
113  EXPECT_TRUE(b != c);
114  EXPECT_FALSE(b == c);
115 }
116 
117 // Tests that a tuple field with a reference type is an alias of the
118 // variable it's supposed to reference.
119 TEST(ReferenceFieldTest, IsAliasOfReferencedVariable) {
120  int n = 0;
121  tuple<bool, int&> t(true, n);
122 
123  n = 1;
124  EXPECT_EQ(n, get<1>(t))
125  << "Changing a underlying variable should update the reference field.";
126 
127  // Makes sure that the implementation doesn't do anything funny with
128  // the & operator for the return type of get<>().
129  EXPECT_EQ(&n, &(get<1>(t)))
130  << "The address of a reference field should equal the address of "
131  << "the underlying variable.";
132 
133  get<1>(t) = 2;
134  EXPECT_EQ(2, n)
135  << "Changing a reference field should update the underlying variable.";
136 }
137 
138 // Tests that tuple's default constructor default initializes each field.
139 // This test needs to compile without generating warnings.
140 TEST(TupleConstructorTest, DefaultConstructorDefaultInitializesEachField) {
141  // The TR1 report requires that tuple's default constructor default
142  // initializes each field, even if it's a primitive type. If the
143  // implementation forgets to do this, this test will catch it by
144  // generating warnings about using uninitialized variables (assuming
145  // a decent compiler).
146 
147  tuple<> empty;
148 
149  tuple<int> a1, b1;
150  b1 = a1;
151  EXPECT_EQ(0, get<0>(b1));
152 
153  tuple<int, double> a2, b2;
154  b2 = a2;
155  EXPECT_EQ(0, get<0>(b2));
156  EXPECT_EQ(0.0, get<1>(b2));
157 
158  tuple<double, char, bool*> a3, b3;
159  b3 = a3;
160  EXPECT_EQ(0.0, get<0>(b3));
161  EXPECT_EQ('\0', get<1>(b3));
162  EXPECT_TRUE(get<2>(b3) == NULL);
163 
164  tuple<int, int, int, int, int, int, int, int, int, int> a10, b10;
165  b10 = a10;
166  EXPECT_EQ(0, get<0>(b10));
167  EXPECT_EQ(0, get<1>(b10));
168  EXPECT_EQ(0, get<2>(b10));
169  EXPECT_EQ(0, get<3>(b10));
170  EXPECT_EQ(0, get<4>(b10));
171  EXPECT_EQ(0, get<5>(b10));
172  EXPECT_EQ(0, get<6>(b10));
173  EXPECT_EQ(0, get<7>(b10));
174  EXPECT_EQ(0, get<8>(b10));
175  EXPECT_EQ(0, get<9>(b10));
176 }
177 
178 // Tests constructing a tuple from its fields.
179 TEST(TupleConstructorTest, ConstructsFromFields) {
180  int n = 1;
181  // Reference field.
182  tuple<int&> a(n);
183  EXPECT_EQ(&n, &(get<0>(a)));
184 
185  // Non-reference fields.
186  tuple<int, char> b(5, 'a');
187  EXPECT_EQ(5, get<0>(b));
188  EXPECT_EQ('a', get<1>(b));
189 
190  // Const reference field.
191  const int m = 2;
192  tuple<bool, const int&> c(true, m);
193  EXPECT_TRUE(get<0>(c));
194  EXPECT_EQ(&m, &(get<1>(c)));
195 }
196 
197 // Tests tuple's copy constructor.
198 TEST(TupleConstructorTest, CopyConstructor) {
199  tuple<double, bool> a(0.0, true);
200  tuple<double, bool> b(a);
201 
202  EXPECT_DOUBLE_EQ(0.0, get<0>(b));
203  EXPECT_TRUE(get<1>(b));
204 }
205 
206 // Tests constructing a tuple from another tuple that has a compatible
207 // but different type.
208 TEST(TupleConstructorTest, ConstructsFromDifferentTupleType) {
209  tuple<int, int, char> a(0, 1, 'a');
210  tuple<double, long, int> b(a);
211 
212  EXPECT_DOUBLE_EQ(0.0, get<0>(b));
213  EXPECT_EQ(1, get<1>(b));
214  EXPECT_EQ('a', get<2>(b));
215 }
216 
217 // Tests constructing a 2-tuple from an std::pair.
218 TEST(TupleConstructorTest, ConstructsFromPair) {
219  ::std::pair<int, char> a(1, 'a');
220  tuple<int, char> b(a);
221  tuple<int, const char&> c(a);
222 }
223 
224 // Tests assigning a tuple to another tuple with the same type.
225 TEST(TupleAssignmentTest, AssignsToSameTupleType) {
226  const tuple<int, long> a(5, 7L);
227  tuple<int, long> b;
228  b = a;
229  EXPECT_EQ(5, get<0>(b));
230  EXPECT_EQ(7L, get<1>(b));
231 }
232 
233 // Tests assigning a tuple to another tuple with a different but
234 // compatible type.
235 TEST(TupleAssignmentTest, AssignsToDifferentTupleType) {
236  const tuple<int, long, bool> a(1, 7L, true);
237  tuple<long, int, bool> b;
238  b = a;
239  EXPECT_EQ(1L, get<0>(b));
240  EXPECT_EQ(7, get<1>(b));
241  EXPECT_TRUE(get<2>(b));
242 }
243 
244 // Tests assigning an std::pair to a 2-tuple.
245 TEST(TupleAssignmentTest, AssignsFromPair) {
246  const ::std::pair<int, bool> a(5, true);
247  tuple<int, bool> b;
248  b = a;
249  EXPECT_EQ(5, get<0>(b));
250  EXPECT_TRUE(get<1>(b));
251 
252  tuple<long, bool> c;
253  c = a;
254  EXPECT_EQ(5L, get<0>(c));
255  EXPECT_TRUE(get<1>(c));
256 }
257 
258 // A fixture for testing big tuples.
259 class BigTupleTest : public testing::Test {
260  protected:
261  typedef tuple<int, int, int, int, int, int, int, int, int, int> BigTuple;
262 
263  BigTupleTest() :
264  a_(1, 0, 0, 0, 0, 0, 0, 0, 0, 2),
265  b_(1, 0, 0, 0, 0, 0, 0, 0, 0, 3) {}
266 
267  BigTuple a_, b_;
268 };
269 
270 // Tests constructing big tuples.
271 TEST_F(BigTupleTest, Construction) {
272  BigTuple a;
273  BigTuple b(b_);
274 }
275 
276 // Tests that get<N>(t) returns the N-th (0-based) field of tuple t.
277 TEST_F(BigTupleTest, get) {
278  EXPECT_EQ(1, get<0>(a_));
279  EXPECT_EQ(2, get<9>(a_));
280 
281  // Tests that get() works on a const tuple too.
282  const BigTuple a(a_);
283  EXPECT_EQ(1, get<0>(a));
284  EXPECT_EQ(2, get<9>(a));
285 }
286 
287 // Tests comparing big tuples.
288 TEST_F(BigTupleTest, Comparisons) {
289  EXPECT_TRUE(a_ == a_);
290  EXPECT_FALSE(a_ != a_);
291 
292  EXPECT_TRUE(a_ != b_);
293  EXPECT_FALSE(a_ == b_);
294 }
295 
296 TEST(MakeTupleTest, WorksForScalarTypes) {
297  tuple<bool, int> a;
298  a = make_tuple(true, 5);
299  EXPECT_TRUE(get<0>(a));
300  EXPECT_EQ(5, get<1>(a));
301 
302  tuple<char, int, long> b;
303  b = make_tuple('a', 'b', 5);
304  EXPECT_EQ('a', get<0>(b));
305  EXPECT_EQ('b', get<1>(b));
306  EXPECT_EQ(5, get<2>(b));
307 }
308 
309 TEST(MakeTupleTest, WorksForPointers) {
310  int a[] = { 1, 2, 3, 4 };
311  const char* const str = "hi";
312  int* const p = a;
313 
314  tuple<const char*, int*> t;
315  t = make_tuple(str, p);
316  EXPECT_EQ(str, get<0>(t));
317  EXPECT_EQ(p, get<1>(t));
318 }
319 
320 } // namespace
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