Question about storing array in a std::vector in C++

Question

I am unclear about the following.

First, this code compiles fine:

#include 

typedef struct{
    int x1,x2,x3,x4;
}  ints;

typedef std         


        

Answer 1

Arrays are not first class in C++; you cannot pass them as arguments to functions, for example (they decay to pointers, although you can pass pointers and references to arrays). Further, they do not have value semantics.