成员的完整列表，这些成员属于 eve::pixelworld_streaming::PixelChunkAckReceipt,包括所有继承而来的类成员

acknowledgedThrough	eve::pixelworld_streaming::PixelChunkAckReceipt
tombstonesReleased	eve::pixelworld_streaming::PixelChunkAckReceipt
transfersReleased	eve::pixelworld_streaming::PixelChunkAckReceipt