composers (tdi: TransferDomainPair): BufferComposer[] {
    return [
      ComposableBuffer.single<TransferDomainItem>(() => tdi.src, v => tdi.src = v, v => new CTransferDomainItem(v)),
      ComposableBuffer.single<TransferDomainItem>(() => tdi.dst, v => tdi.dst = v, v => new CTransferDomainItem(v))
    ]