Hi, Here is comment from line 36, gcc/vec.h
Both the structure object and pointer variants pass pointers to objects around -- in the former case the pointers are stored into the vector and in the latter case the pointers are dereferenced and the objects copied into the vector. But by reading implementation, it seems that this description is reverse. I think that it should be something like in the *latter* case the pointers are stored into the vector and in the *former* case the pointers are dereferenced and the objects copied into the vector. That is, the pointers in structure object variant are dereferenced and the objects copied into the vector. Am I missing something? Thanks, Liang.