michael@0: // Copyright 2007, Google Inc.
michael@0: // All rights reserved.
michael@0: //
michael@0: // Redistribution and use in source and binary forms, with or without
michael@0: // modification, are permitted provided that the following conditions are
michael@0: // met:
michael@0: //
michael@0: //     * Redistributions of source code must retain the above copyright
michael@0: // notice, this list of conditions and the following disclaimer.
michael@0: //     * Redistributions in binary form must reproduce the above
michael@0: // copyright notice, this list of conditions and the following disclaimer
michael@0: // in the documentation and/or other materials provided with the
michael@0: // distribution.
michael@0: //     * Neither the name of Google Inc. nor the names of its
michael@0: // contributors may be used to endorse or promote products derived from
michael@0: // this software without specific prior written permission.
michael@0: //
michael@0: // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
michael@0: // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
michael@0: // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
michael@0: // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
michael@0: // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
michael@0: // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
michael@0: // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
michael@0: // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
michael@0: // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
michael@0: // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
michael@0: // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
michael@0: //
michael@0: // Author: wan@google.com (Zhanyong Wan)
michael@0: 
michael@0: #include "gtest/internal/gtest-tuple.h"
michael@0: #include <utility>
michael@0: #include "gtest/gtest.h"
michael@0: 
michael@0: namespace {
michael@0: 
michael@0: using ::std::tr1::get;
michael@0: using ::std::tr1::make_tuple;
michael@0: using ::std::tr1::tuple;
michael@0: using ::std::tr1::tuple_element;
michael@0: using ::std::tr1::tuple_size;
michael@0: using ::testing::StaticAssertTypeEq;
michael@0: 
michael@0: // Tests that tuple_element<K, tuple<T0, T1, ..., TN> >::type returns TK.
michael@0: TEST(tuple_element_Test, ReturnsElementType) {
michael@0:   StaticAssertTypeEq<int, tuple_element<0, tuple<int, char> >::type>();
michael@0:   StaticAssertTypeEq<int&, tuple_element<1, tuple<double, int&> >::type>();
michael@0:   StaticAssertTypeEq<bool, tuple_element<2, tuple<double, int, bool> >::type>();
michael@0: }
michael@0: 
michael@0: // Tests that tuple_size<T>::value gives the number of fields in tuple
michael@0: // type T.
michael@0: TEST(tuple_size_Test, ReturnsNumberOfFields) {
michael@0:   EXPECT_EQ(0, +tuple_size<tuple<> >::value);
michael@0:   EXPECT_EQ(1, +tuple_size<tuple<void*> >::value);
michael@0:   EXPECT_EQ(1, +tuple_size<tuple<char> >::value);
michael@0:   EXPECT_EQ(1, +(tuple_size<tuple<tuple<int, double> > >::value));
michael@0:   EXPECT_EQ(2, +(tuple_size<tuple<int&, const char> >::value));
michael@0:   EXPECT_EQ(3, +(tuple_size<tuple<char*, void, const bool&> >::value));
michael@0: }
michael@0: 
michael@0: // Tests comparing a tuple with itself.
michael@0: TEST(ComparisonTest, ComparesWithSelf) {
michael@0:   const tuple<int, char, bool> a(5, 'a', false);
michael@0: 
michael@0:   EXPECT_TRUE(a == a);
michael@0:   EXPECT_FALSE(a != a);
michael@0: }
michael@0: 
michael@0: // Tests comparing two tuples with the same value.
michael@0: TEST(ComparisonTest, ComparesEqualTuples) {
michael@0:   const tuple<int, bool> a(5, true), b(5, true);
michael@0: 
michael@0:   EXPECT_TRUE(a == b);
michael@0:   EXPECT_FALSE(a != b);
michael@0: }
michael@0: 
michael@0: // Tests comparing two different tuples that have no reference fields.
michael@0: TEST(ComparisonTest, ComparesUnequalTuplesWithoutReferenceFields) {
michael@0:   typedef tuple<const int, char> FooTuple;
michael@0: 
michael@0:   const FooTuple a(0, 'x');
michael@0:   const FooTuple b(1, 'a');
michael@0: 
michael@0:   EXPECT_TRUE(a != b);
michael@0:   EXPECT_FALSE(a == b);
michael@0: 
michael@0:   const FooTuple c(1, 'b');
michael@0: 
michael@0:   EXPECT_TRUE(b != c);
michael@0:   EXPECT_FALSE(b == c);
michael@0: }
michael@0: 
michael@0: // Tests comparing two different tuples that have reference fields.
michael@0: TEST(ComparisonTest, ComparesUnequalTuplesWithReferenceFields) {
michael@0:   typedef tuple<int&, const char&> FooTuple;
michael@0: 
michael@0:   int i = 5;
michael@0:   const char ch = 'a';
michael@0:   const FooTuple a(i, ch);
michael@0: 
michael@0:   int j = 6;
michael@0:   const FooTuple b(j, ch);
michael@0: 
michael@0:   EXPECT_TRUE(a != b);
michael@0:   EXPECT_FALSE(a == b);
michael@0: 
michael@0:   j = 5;
michael@0:   const char ch2 = 'b';
michael@0:   const FooTuple c(j, ch2);
michael@0: 
michael@0:   EXPECT_TRUE(b != c);
michael@0:   EXPECT_FALSE(b == c);
michael@0: }
michael@0: 
michael@0: // Tests that a tuple field with a reference type is an alias of the
michael@0: // variable it's supposed to reference.
michael@0: TEST(ReferenceFieldTest, IsAliasOfReferencedVariable) {
michael@0:   int n = 0;
michael@0:   tuple<bool, int&> t(true, n);
michael@0: 
michael@0:   n = 1;
michael@0:   EXPECT_EQ(n, get<1>(t))
michael@0:       << "Changing a underlying variable should update the reference field.";
michael@0: 
michael@0:   // Makes sure that the implementation doesn't do anything funny with
michael@0:   // the & operator for the return type of get<>().
michael@0:   EXPECT_EQ(&n, &(get<1>(t)))
michael@0:       << "The address of a reference field should equal the address of "
michael@0:       << "the underlying variable.";
michael@0: 
michael@0:   get<1>(t) = 2;
michael@0:   EXPECT_EQ(2, n)
michael@0:       << "Changing a reference field should update the underlying variable.";
michael@0: }
michael@0: 
michael@0: // Tests that tuple's default constructor default initializes each field.
michael@0: // This test needs to compile without generating warnings.
michael@0: TEST(TupleConstructorTest, DefaultConstructorDefaultInitializesEachField) {
michael@0:   // The TR1 report requires that tuple's default constructor default
michael@0:   // initializes each field, even if it's a primitive type.  If the
michael@0:   // implementation forgets to do this, this test will catch it by
michael@0:   // generating warnings about using uninitialized variables (assuming
michael@0:   // a decent compiler).
michael@0: 
michael@0:   tuple<> empty;
michael@0: 
michael@0:   tuple<int> a1, b1;
michael@0:   b1 = a1;
michael@0:   EXPECT_EQ(0, get<0>(b1));
michael@0: 
michael@0:   tuple<int, double> a2, b2;
michael@0:   b2 = a2;
michael@0:   EXPECT_EQ(0, get<0>(b2));
michael@0:   EXPECT_EQ(0.0, get<1>(b2));
michael@0: 
michael@0:   tuple<double, char, bool*> a3, b3;
michael@0:   b3 = a3;
michael@0:   EXPECT_EQ(0.0, get<0>(b3));
michael@0:   EXPECT_EQ('\0', get<1>(b3));
michael@0:   EXPECT_TRUE(get<2>(b3) == NULL);
michael@0: 
michael@0:   tuple<int, int, int, int, int, int, int, int, int, int> a10, b10;
michael@0:   b10 = a10;
michael@0:   EXPECT_EQ(0, get<0>(b10));
michael@0:   EXPECT_EQ(0, get<1>(b10));
michael@0:   EXPECT_EQ(0, get<2>(b10));
michael@0:   EXPECT_EQ(0, get<3>(b10));
michael@0:   EXPECT_EQ(0, get<4>(b10));
michael@0:   EXPECT_EQ(0, get<5>(b10));
michael@0:   EXPECT_EQ(0, get<6>(b10));
michael@0:   EXPECT_EQ(0, get<7>(b10));
michael@0:   EXPECT_EQ(0, get<8>(b10));
michael@0:   EXPECT_EQ(0, get<9>(b10));
michael@0: }
michael@0: 
michael@0: // Tests constructing a tuple from its fields.
michael@0: TEST(TupleConstructorTest, ConstructsFromFields) {
michael@0:   int n = 1;
michael@0:   // Reference field.
michael@0:   tuple<int&> a(n);
michael@0:   EXPECT_EQ(&n, &(get<0>(a)));
michael@0: 
michael@0:   // Non-reference fields.
michael@0:   tuple<int, char> b(5, 'a');
michael@0:   EXPECT_EQ(5, get<0>(b));
michael@0:   EXPECT_EQ('a', get<1>(b));
michael@0: 
michael@0:   // Const reference field.
michael@0:   const int m = 2;
michael@0:   tuple<bool, const int&> c(true, m);
michael@0:   EXPECT_TRUE(get<0>(c));
michael@0:   EXPECT_EQ(&m, &(get<1>(c)));
michael@0: }
michael@0: 
michael@0: // Tests tuple's copy constructor.
michael@0: TEST(TupleConstructorTest, CopyConstructor) {
michael@0:   tuple<double, bool> a(0.0, true);
michael@0:   tuple<double, bool> b(a);
michael@0: 
michael@0:   EXPECT_DOUBLE_EQ(0.0, get<0>(b));
michael@0:   EXPECT_TRUE(get<1>(b));
michael@0: }
michael@0: 
michael@0: // Tests constructing a tuple from another tuple that has a compatible
michael@0: // but different type.
michael@0: TEST(TupleConstructorTest, ConstructsFromDifferentTupleType) {
michael@0:   tuple<int, int, char> a(0, 1, 'a');
michael@0:   tuple<double, long, int> b(a);
michael@0: 
michael@0:   EXPECT_DOUBLE_EQ(0.0, get<0>(b));
michael@0:   EXPECT_EQ(1, get<1>(b));
michael@0:   EXPECT_EQ('a', get<2>(b));
michael@0: }
michael@0: 
michael@0: // Tests constructing a 2-tuple from an std::pair.
michael@0: TEST(TupleConstructorTest, ConstructsFromPair) {
michael@0:   ::std::pair<int, char> a(1, 'a');
michael@0:   tuple<int, char> b(a);
michael@0:   tuple<int, const char&> c(a);
michael@0: }
michael@0: 
michael@0: // Tests assigning a tuple to another tuple with the same type.
michael@0: TEST(TupleAssignmentTest, AssignsToSameTupleType) {
michael@0:   const tuple<int, long> a(5, 7L);
michael@0:   tuple<int, long> b;
michael@0:   b = a;
michael@0:   EXPECT_EQ(5, get<0>(b));
michael@0:   EXPECT_EQ(7L, get<1>(b));
michael@0: }
michael@0: 
michael@0: // Tests assigning a tuple to another tuple with a different but
michael@0: // compatible type.
michael@0: TEST(TupleAssignmentTest, AssignsToDifferentTupleType) {
michael@0:   const tuple<int, long, bool> a(1, 7L, true);
michael@0:   tuple<long, int, bool> b;
michael@0:   b = a;
michael@0:   EXPECT_EQ(1L, get<0>(b));
michael@0:   EXPECT_EQ(7, get<1>(b));
michael@0:   EXPECT_TRUE(get<2>(b));
michael@0: }
michael@0: 
michael@0: // Tests assigning an std::pair to a 2-tuple.
michael@0: TEST(TupleAssignmentTest, AssignsFromPair) {
michael@0:   const ::std::pair<int, bool> a(5, true);
michael@0:   tuple<int, bool> b;
michael@0:   b = a;
michael@0:   EXPECT_EQ(5, get<0>(b));
michael@0:   EXPECT_TRUE(get<1>(b));
michael@0: 
michael@0:   tuple<long, bool> c;
michael@0:   c = a;
michael@0:   EXPECT_EQ(5L, get<0>(c));
michael@0:   EXPECT_TRUE(get<1>(c));
michael@0: }
michael@0: 
michael@0: // A fixture for testing big tuples.
michael@0: class BigTupleTest : public testing::Test {
michael@0:  protected:
michael@0:   typedef tuple<int, int, int, int, int, int, int, int, int, int> BigTuple;
michael@0: 
michael@0:   BigTupleTest() :
michael@0:       a_(1, 0, 0, 0, 0, 0, 0, 0, 0, 2),
michael@0:       b_(1, 0, 0, 0, 0, 0, 0, 0, 0, 3) {}
michael@0: 
michael@0:   BigTuple a_, b_;
michael@0: };
michael@0: 
michael@0: // Tests constructing big tuples.
michael@0: TEST_F(BigTupleTest, Construction) {
michael@0:   BigTuple a;
michael@0:   BigTuple b(b_);
michael@0: }
michael@0: 
michael@0: // Tests that get<N>(t) returns the N-th (0-based) field of tuple t.
michael@0: TEST_F(BigTupleTest, get) {
michael@0:   EXPECT_EQ(1, get<0>(a_));
michael@0:   EXPECT_EQ(2, get<9>(a_));
michael@0: 
michael@0:   // Tests that get() works on a const tuple too.
michael@0:   const BigTuple a(a_);
michael@0:   EXPECT_EQ(1, get<0>(a));
michael@0:   EXPECT_EQ(2, get<9>(a));
michael@0: }
michael@0: 
michael@0: // Tests comparing big tuples.
michael@0: TEST_F(BigTupleTest, Comparisons) {
michael@0:   EXPECT_TRUE(a_ == a_);
michael@0:   EXPECT_FALSE(a_ != a_);
michael@0: 
michael@0:   EXPECT_TRUE(a_ != b_);
michael@0:   EXPECT_FALSE(a_ == b_);
michael@0: }
michael@0: 
michael@0: TEST(MakeTupleTest, WorksForScalarTypes) {
michael@0:   tuple<bool, int> a;
michael@0:   a = make_tuple(true, 5);
michael@0:   EXPECT_TRUE(get<0>(a));
michael@0:   EXPECT_EQ(5, get<1>(a));
michael@0: 
michael@0:   tuple<char, int, long> b;
michael@0:   b = make_tuple('a', 'b', 5);
michael@0:   EXPECT_EQ('a', get<0>(b));
michael@0:   EXPECT_EQ('b', get<1>(b));
michael@0:   EXPECT_EQ(5, get<2>(b));
michael@0: }
michael@0: 
michael@0: TEST(MakeTupleTest, WorksForPointers) {
michael@0:   int a[] = { 1, 2, 3, 4 };
michael@0:   const char* const str = "hi";
michael@0:   int* const p = a;
michael@0: 
michael@0:   tuple<const char*, int*> t;
michael@0:   t = make_tuple(str, p);
michael@0:   EXPECT_EQ(str, get<0>(t));
michael@0:   EXPECT_EQ(p, get<1>(t));
michael@0: }
michael@0: 
michael@0: }  // namespace