*&p 形参的一种表现

test.cpp

#include <cstddef>
const char *advanceP(const char *&p, size_t n)
{
   const char *pp = p;
   p += n;
   return pp;
}

typedef struct
{
   int a;
   float b;
   char c[10];
} Obj;

int main()
{
   const char *p;
   const char *oldp = advanceP(p, sizeof(Obj));
   const Obj *objp = (const Obj*)p;
   const Obj *objoldp = (const Obj*)oldp;
   printf("%f\n", objp->b);
   printf("%d\n", (*(const Obj*)oldp).a);
   return 0;
}