A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `W::get`.
A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `W::get`.该类型满足 ConstBufferSequence 的要求,为 W::get 返回的缓冲区类型。
A type which meets the requirements of __ConstBufferSequence__. This is the type of buffer returned by `W::get`.该类型满足 ConstBufferSequence 的要求,为 W::get 返回的缓冲区类型。