Aliasing struct and array the C++ way

Question

This is a C++ followup for another question of mine

In the old days of pre-ISO C, the following code would have surprised nobody:

struct Point {
             


        

Answer 1

You could use the fact that casting a pointer to intptr_t doing arithmetic and then casting the value back to the pointer type is implemetation defined behavior. I believe it will work on most of the compilers:

template
T* increment_pointer(T* a){
  return reinterpret_cast(reinterpret_cast(a)+sizeof(T));
  }

This technic is the most efficient, optimizers seems not to be able to produce optimal if one use table look up: assemblies-comparison