Method operator[]

less_slow.cpp:420–420

    type_ *end() const noexcept { return data_ + size_; }
    type_ &operator[](std::size_t index) noexcept { return data_[index]; }
    type_ operator[](std::size_t index) const noexcept { return data_[index]; }
};

static void sorting(bm::State &state) {