Method operator=

tests/unit_test/mocks/io_buffer_mock.cpp:31–38

      size_{std::exchange(other.size_, 0)} {}

auto IoBuffer::operator=(IoBuffer&& other) noexcept -> IoBuffer& {
  if (this != &other) {
    free(data_);
    data_ = std::exchange(other.data_, nullptr);
    size_ = std::exchange(other.size_, 0);
  }
  return *this;
}

auto IoBuffer::GetBuffer() const -> std::span<const uint8_t> {
  return {data_, size_};