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/thirdparty/breakpad/third_party/protobuf/protobuf/gtest/test/gtest-tuple_test.cc

http://github.com/tomahawk-player/tomahawk
C++ | 320 lines | 200 code | 55 blank | 65 comment | 17 complexity | 71ecfd3e4e09472cd2290fcd3fc900ee MD5 | raw file
  1// Copyright 2007, Google Inc.
  2// All rights reserved.
  3//
  4// Redistribution and use in source and binary forms, with or without
  5// modification, are permitted provided that the following conditions are
  6// met:
  7//
  8//     * Redistributions of source code must retain the above copyright
  9// notice, this list of conditions and the following disclaimer.
 10//     * Redistributions in binary form must reproduce the above
 11// copyright notice, this list of conditions and the following disclaimer
 12// in the documentation and/or other materials provided with the
 13// distribution.
 14//     * Neither the name of Google Inc. nor the names of its
 15// contributors may be used to endorse or promote products derived from
 16// this software without specific prior written permission.
 17//
 18// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 19// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 22// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 23// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 24// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 25// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 26// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 27// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 28// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 29//
 30// Author: wan@google.com (Zhanyong Wan)
 31
 32#include <gtest/internal/gtest-tuple.h>
 33#include <utility>
 34#include <gtest/gtest.h>
 35
 36namespace {
 37
 38using ::std::tr1::get;
 39using ::std::tr1::make_tuple;
 40using ::std::tr1::tuple;
 41using ::std::tr1::tuple_element;
 42using ::std::tr1::tuple_size;
 43using ::testing::StaticAssertTypeEq;
 44
 45// Tests that tuple_element<K, tuple<T0, T1, ..., TN> >::type returns TK.
 46TEST(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.
 54TEST(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.
 64TEST(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.
 72TEST(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.
 80TEST(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.
 96TEST(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.
119TEST(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.
140TEST(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.
179TEST(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.
198TEST(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.
208TEST(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.
218TEST(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.
225TEST(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.
235TEST(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.
245TEST(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.
259class 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.
271TEST_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.
277TEST_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.
288TEST_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
296TEST(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
309TEST(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