Using "strcpy" to assign value to dynamic char array

[pascal111]

On Monday, 1 November 2021 at 21:32:21 UTC, Ali Çehreli wrote:
> On 11/1/21 2:01 PM, Ali Çehreli wrote:
>
> > The program is as incorrect as its C equivalent would be. ;)
>
> I wrote a cool function to make it easy to disregard memory 
> safety:
>
> import std.stdio;
>
> auto assumedLength(S)(ref S slice) {
>   struct LengthSetter {
>     void opAssign(size_t length) {
>       // Nooo! :)
>       *cast(size_t*)(&slice) = length;
>     }
>   }
>
>   return LengthSetter();
> }
>
> void main() {
>   auto arr = [ 1, 2, 3 ];
>   arr.assumedLength = 10;
>   writeln(arr);
> }
>
> Joking aside, I liked the nested struct and its opAssign to 
> mimic internal `arr.length = 42` syntax. (I know it involves a 
> potentially expensive delegate but still...)
>
> Ali

This function seems smart and flexible and higher than my current 
level, I'll study it.