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User forums => Help => Topic started by: Mr.Madguy on May 22, 2023, 08:23:03 pm

Title: Pointer arithmetic - casting pointer to other type
Post by: Mr.Madguy on May 22, 2023, 08:23:03 pm

I'm new to C++ and this language seems to be a little bit vague for me.

Please explain, for what reason I should use such code

Code

void* Src;
{
  t* TempSrc = (t*)Src;
  ...
  TempSrc++;
  ...
  Src = (void*)TempSrc;
};

instead of just

Code

  void* Src;
  (t*)Src++;

?

In second case compiler complains about incrementing void pointer, so I assume, that pointer casting doesn't work. And in case of ((t*)Src)++ compiler complains about lvalue.

Title: Re: Pointer arithmetic - casting pointer to other type
Post by: Miguel Gimenez on May 22, 2023, 08:42:22 pm

Programming questions are OT here.

Title: Re: Pointer arithmetic - casting pointer to other type
Post by: Mr.Madguy on May 22, 2023, 09:12:18 pm

Ok, seems to be fixed via following trick:

Code

Src = (void*)((t*)Src + 1);