Re: What's the fastest way to check if a slice points to static data

[ketmar via Digitalmars-d-learn]

Petar Kirov [ZombineDev] wrote:

>> Please note that not all static immutable strings have to be null 
>> terminated.
>> It is possible to generate a string at ctfe which may appear the same as 
>> string literal, but does not have the \0 at the end.
>
> But in that case, the check `s.ptr[s.length] == 0` in fastStringZ
> would do the trick, right?

with the edge case when something like the code i posted below managed to 
make `a` perfectly aligned with r/o area, and you got segfault by accising 
out-of-bounds byte.

> BTW, are you sure? AFAIU, it doesn't matter if the CTFE engine returns a
> non-null-terminated string expression, since the backend or the glue layer
> would write it to the object file as if it was a null-terminated string.

	immutable ubyte[2] a = [65,66];
	enum string s = cast(string)a;
	immutable ubyte[2] b = [67,68]; // just to show you that there is no zero
	
	void main () {
	  assert(s[$-1] == 0);
	}