That vector is called a "null vector".

那种矢量就叫做”零矢量“。

youdao

Lastly, the memory allocated to the vector is also freed and NULL vector is returned to the caller.

最后，还要释放分配给向量的内存并把NULL向量返回给调用者。

youdao

This routine initially checks to see if NULL manager entry point vector, mgr_epv, was passed.

这个例程首先检查传递的管理器入口点向量mgr_epv是否是NULL。

youdao