// Copyright 2007, Google Inc.
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//
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// met:
//
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// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
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//
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#include "gtest/internal/gtest-tuple.h"
#include <utility>
#include "gtest/gtest.h"
namespace {
using ::std::tr1::get;
using ::std::tr1::make_tuple;
using ::std::tr1::tuple;
using ::std::tr1::tuple_element;
using ::std::tr1::tuple_size;
using ::testing::StaticAssertTypeEq;
// Tests that tuple_element<K, tuple<T0, T1, ..., TN> >::type returns TK.
TEST(tuple_element_Test, ReturnsElementType) {
StaticAssertTypeEq<int, tuple_element<0, tuple<int, char> >::type>();
StaticAssertTypeEq<int&, tuple_element<1, tuple<double, int&> >::type>();
StaticAssertTypeEq<bool, tuple_element<2, tuple<double, int, bool> >::type>();
}
// Tests that tuple_size<T>::value gives the number of fields in tuple
// type T.
TEST(tuple_size_Test, ReturnsNumberOfFields) {
EXPECT_EQ(0, +tuple_size<tuple<> >::value);
EXPECT_EQ(1, +tuple_size<tuple<void*> >::value);
EXPECT_EQ(1, +tuple_size<tuple<char> >::value);
EXPECT_EQ(1, +(tuple_size<tuple<tuple<int, double> > >::value));
EXPECT_EQ(2, +(tuple_size<tuple<int&, const char> >::value));
EXPECT_EQ(3, +(tuple_size<tuple<char*, void, const bool&> >::value));
}
// Tests comparing a tuple with itself.
TEST(ComparisonTest, ComparesWithSelf) {
const tuple<int, char, bool> a(5, 'a', false);
EXPECT_TRUE(a == a);
EXPECT_FALSE(a != a);
}
// Tests comparing two tuples with the same value.
TEST(ComparisonTest, ComparesEqualTuples) {
const tuple<int, bool> a(5, true), b(5, true);
EXPECT_TRUE(a == b);
EXPECT_FALSE(a != b);
}
// Tests comparing two different tuples that have no reference fields.
TEST(ComparisonTest, ComparesUnequalTuplesWithoutReferenceFields) {
typedef tuple<const int, char> FooTuple;
const FooTuple a(0, 'x');
const FooTuple b(1, 'a');
EXPECT_TRUE(a != b);
EXPECT_FALSE(a == b);
const FooTuple c(1, 'b');
EXPECT_TRUE(b != c);
EXPECT_FALSE(b == c);
}
// Tests comparing two different tuples that have reference fields.
TEST(ComparisonTest, ComparesUnequalTuplesWithReferenceFields) {
typedef tuple<int&, const char&> FooTuple;
int i = 5;
const char ch = 'a';
const FooTuple a(i, ch);
int j = 6;
const FooTuple b(j, ch);
EXPECT_TRUE(a != b);
EXPECT_FALSE(a == b);
j = 5;
const char ch2 = 'b';
const FooTuple c(j, ch2);
EXPECT_TRUE(b != c);
EXPECT_FALSE(b == c);
}
// Tests that a tuple field with a reference type is an alias of the
// variable it's supposed to reference.
TEST(ReferenceFieldTest, IsAliasOfReferencedVariable) {
int n = 0;
tuple<bool, int&> t(true, n);
n = 1;
EXPECT_EQ(n, get<1>(t))
<< "Changing a underlying variable should update the reference field.";
// Makes sure that the implementation doesn't do anything funny with
// the & operator for the return type of get<>().
EXPECT_EQ(&n, &(get<1>(t)))
<< "The address of a reference field should equal the address of "
<< "the underlying variable.";
get<1>(t) = 2;
EXPECT_EQ(2, n)
<< "Changing a reference field should update the underlying variable.";
}
// Tests that tuple's default constructor default initializes each field.
// This test needs to compile without generating warnings.
TEST(TupleConstructorTest, DefaultConstructorDefaultInitializesEachField) {
// The TR1 report requires that tuple's default constructor default
// initializes each field, even if it's a primitive type. If the
// implementation forgets to do this, this test will catch it by
// generating warnings about using uninitialized variables (assuming
// a decent compiler).
tuple<> empty;
tuple<int> a1, b1;
b1 = a1;
EXPECT_EQ(0, get<0>(b1));
tuple<int, double> a2, b2;
b2 = a2;
EXPECT_EQ(0, get<0>(b2));
EXPECT_EQ(0.0, get<1>(b2));
tuple<double, char, bool*> a3, b3;
b3 = a3;
EXPECT_EQ(0.0, get<0>(b3));
EXPECT_EQ('\0', get<1>(b3));
EXPECT_TRUE(get<2>(b3) == NULL);
tuple<int, int, int, int, int, int, int, int, int, int> a10, b10;
b10 = a10;
EXPECT_EQ(0, get<0>(b10));
EXPECT_EQ(0, get<1>(b10));
EXPECT_EQ(0, get<2>(b10));
EXPECT_EQ(0, get<3>(b10));
EXPECT_EQ(0, get<4>(b10));
EXPECT_EQ(0, get<5>(b10));
EXPECT_EQ(0, get<6>(b10));
EXPECT_EQ(0, get<7>(b10));
EXPECT_EQ(0, get<8>(b10));
EXPECT_EQ(0, get<9>(b10));
}
// Tests constructing a tuple from its fields.
TEST(TupleConstructorTest, ConstructsFromFields) {
int n = 1;
// Reference field.
tuple<int&> a(n);
EXPECT_EQ(&n, &(get<0>(a)));
// Non-reference fields.
tuple<int, char> b(5, 'a');
EXPECT_EQ(5, get<0>(b));
EXPECT_EQ('a', get<1>(b));
// Const reference field.
const int m = 2;
tuple<bool, const int&> c(true, m);
EXPECT_TRUE(get<0>(c));
EXPECT_EQ(&m, &(get<1>(c)));
}
// Tests tuple's copy constructor.
TEST(TupleConstructorTest, CopyConstructor) {
tuple<double, bool> a(0.0, true);
tuple<double, bool> b(a);
EXPECT_DOUBLE_EQ(0.0, get<0>(b));
EXPECT_TRUE(get<1>(b));
}
// Tests constructing a tuple from another tuple that has a compatible
// but different type.
TEST(TupleConstructorTest, ConstructsFromDifferentTupleType) {
tuple<int, int, char> a(0, 1, 'a');
tuple<double, long, int> b(a);
EXPECT_DOUBLE_EQ(0.0, get<0>(b));
EXPECT_EQ(1, get<1>(b));
EXPECT_EQ('a', get<2>(b));
}
// Tests constructing a 2-tuple from an std::pair.
TEST(TupleConstructorTest, ConstructsFromPair) {
::std::pair<int, char> a(1, 'a');
tuple<int, char> b(a);
tuple<int, const char&> c(a);
}
// Tests assigning a tuple to another tuple with the same type.
TEST(TupleAssignmentTest, AssignsToSameTupleType) {
const tuple<int, long> a(5, 7L);
tuple<int, long> b;
b = a;
EXPECT_EQ(5, get<0>(b));
EXPECT_EQ(7L, get<1>(b));
}
// Tests assigning a tuple to another tuple with a different but
// compatible type.
TEST(TupleAssignmentTest, AssignsToDifferentTupleType) {
const tuple<int, long, bool> a(1, 7L, true);
tuple<long, int, bool> b;
b = a;
EXPECT_EQ(1L, get<0>(b));
EXPECT_EQ(7, get<1>(b));
EXPECT_TRUE(get<2>(b));
}
// Tests assigning an std::pair to a 2-tuple.
TEST(TupleAssignmentTest, AssignsFromPair) {
const ::std::pair<int, bool> a(5, true);
tuple<int, bool> b;
b = a;
EXPECT_EQ(5, get<0>(b));
EXPECT_TRUE(get<1>(b));
tuple<long, bool> c;
c = a;
EXPECT_EQ(5L, get<0>(c));
EXPECT_TRUE(get<1>(c));
}
// A fixture for testing big tuples.
class BigTupleTest : public testing::Test {
protected:
typedef tuple<int, int, int, int, int, int, int, int, int, int> BigTuple;
BigTupleTest() :
a_(1, 0, 0, 0, 0, 0, 0, 0, 0, 2),
b_(1, 0, 0, 0, 0, 0, 0, 0, 0, 3) {}
BigTuple a_, b_;
};
// Tests constructing big tuples.
TEST_F(BigTupleTest, Construction) {
BigTuple a;
BigTuple b(b_);
}
// Tests that get<N>(t) returns the N-th (0-based) field of tuple t.
TEST_F(BigTupleTest, get) {
EXPECT_EQ(1, get<0>(a_));
EXPECT_EQ(2, get<9>(a_));
// Tests that get() works on a const tuple too.
const BigTuple a(a_);
EXPECT_EQ(1, get<0>(a));
EXPECT_EQ(2, get<9>(a));
}
// Tests comparing big tuples.
TEST_F(BigTupleTest, Comparisons) {
EXPECT_TRUE(a_ == a_);
EXPECT_FALSE(a_ != a_);
EXPECT_TRUE(a_ != b_);
EXPECT_FALSE(a_ == b_);
}
TEST(MakeTupleTest, WorksForScalarTypes) {
tuple<bool, int> a;
a = make_tuple(true, 5);
EXPECT_TRUE(get<0>(a));
EXPECT_EQ(5, get<1>(a));
tuple<char, int, long> b;
b = make_tuple('a', 'b', 5);
EXPECT_EQ('a', get<0>(b));
EXPECT_EQ('b', get<1>(b));
EXPECT_EQ(5, get<2>(b));
}
TEST(MakeTupleTest, WorksForPointers) {
int a[] = { 1, 2, 3, 4 };
const char* const str = "hi";
int* const p = a;
tuple<const char*, int*> t;
t = make_tuple(str, p);
EXPECT_EQ(str, get<0>(t));
EXPECT_EQ(p, get<1>(t));
}
} // namespace