Tools/TestWebKitAPI/Tests/WTF/IteratorRange.cpp

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#include "config.h"

#include <array>
#include <wtf/IteratorRange.h>
#include <wtf/Vector.h>

namespace TestWebKitAPI {

TEST(WTF_IteratorRange, MakeReversedRange)
{
    Vector<int> intVector { 10, 11, 12, 13 };

    auto reversedRange = WTF::makeReversedRange(intVector);

    static_assert(std::is_same<decltype(reversedRange.begin()), typename Vector<int>::reverse_iterator>::value, "IteratorRange has correct begin() iterator type");
    static_assert(std::is_same<decltype(reversedRange.end()), typename Vector<int>::reverse_iterator>::value, "IteratorRange has correct end() iterator type");

    EXPECT_EQ(reversedRange.begin(), intVector.rbegin());
    EXPECT_EQ(reversedRange.end(), intVector.rend());

    std::array<int, 4> expectedResults { { 13, 12, 11, 10 } };
    size_t index = 0;

    for (auto& value : reversedRange)
        EXPECT_EQ(value, expectedResults[index++]);
}

TEST(WTF_IteratorRange, MakeConstReversedRange)
{
    const Vector<int> intVector { 10, 11, 12, 13 };

    auto reversedRange = WTF::makeReversedRange(intVector);

    static_assert(std::is_same<decltype(reversedRange.begin()), typename Vector<int>::const_reverse_iterator>::value, "IteratorRange has correct begin() iterator type");
    static_assert(std::is_same<decltype(reversedRange.end()), typename Vector<int>::const_reverse_iterator>::value, "IteratorRange has correct end() iterator type");

    EXPECT_EQ(reversedRange.begin(), intVector.rbegin());
    EXPECT_EQ(reversedRange.end(), intVector.rend());

    std::array<int, 4> expectedResults { { 13, 12, 11, 10 } };
    size_t index = 0;

    for (auto& value : reversedRange)
        EXPECT_EQ(value, expectedResults[index++]);
}

TEST(WTF_IteratorRange, MakeReversedRangeFromRange)
{
    Vector<int> intVector { 10, 11, 12, 13 };

    auto range = IteratorRange { intVector.begin(), intVector.end() };

    auto reversedRange = makeReversedRange(range);

    EXPECT_EQ(reversedRange.begin(), intVector.rbegin());
    EXPECT_EQ(reversedRange.end(), intVector.rend());

    std::array<int, 4> expectedResults { { 13, 12, 11, 10 } };
    size_t index = 0;

    for (auto& value : reversedRange)
        EXPECT_EQ(value, expectedResults[index++]);
}

TEST(WTF_IteratorRange, OneWayIterator)
{
    struct OneWayIterator {
        int* ptr;

        bool operator!=(const OneWayIterator& other) { return ptr != other.ptr; }
        auto& operator*() const { return *ptr; }
        void operator++() { ++ptr; }
    };

    Vector<int> intVector { 10, 11, 12, 13 };

    auto range = IteratorRange { OneWayIterator { intVector.begin() }, OneWayIterator { intVector.end() } };

    std::array<int, 4> expectedResults { { 10, 11, 12, 13 } };
    size_t index = 0;

    for (auto& value : range)
        EXPECT_EQ(value, expectedResults[index++]);
}

} // namespace TestWebKitAPI