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