Function TestIteratorDifferenceImpl

util/generic/xrange_ut.cpp:161–168

    template <class TRange>
    static void TestIteratorDifferenceImpl(TRange range, int a, int b, TMaybe<int> step) {
        auto fmtCase = [&]() -> TString { return TStringBuilder() << "xrange(" << a << ", " << b << (step ? ", " + ToString(*step) : TString{}) << ")"; };
        auto begin = std::begin(range);
        auto end = std::end(range);
        auto distance = end - begin;
        UNIT_ASSERT_VALUES_EQUAL_C(range.size(), distance, fmtCase());
        UNIT_ASSERT_EQUAL_C(end, begin + distance, fmtCase());
    }

    Y_UNIT_TEST(IteratorDifference) {
        for (int a = -20; a <= 20; ++a) {