What exactly are the String literrals in D and how they work?

[jfondren]

On Sunday, 15 August 2021 at 08:11:39 UTC, rempas wrote:
> On Sunday, 15 August 2021 at 07:43:59 UTC, jfondren wrote:
>> ```d
>> unittest {
>>     char* s = "John".dup.ptr;
>>     s[0] = 'X'; // no segfaults
>>     assert(s[0..4] == "Xohn"); // ok
>> }
>> ```
>>
>
> Well, that one didn't worked out really well for me. Using 
> `.dup.ptr`, didn't added a null terminated character

dup() isn't aware of the NUL since that's outside the slice of 
the string. It only copies the chars in "John". You can use 
toStringz to ensure NUL termination:
https://dlang.org/phobos/std_string.html#.toStringz