Const initialization issue, looking for solution

[Jakob Ovrum]

On Wednesday, 29 May 2013 at 15:14:54 UTC, Kenji Hara wrote:
> With 2.063, this code would work.
>
> struct S { int* ptr; }  // has mutable indirection
>
> void main()
> {
>     immutable S si = function () pure
>     {
>         S sm;
>         sm.ptr = new int;
>         *sm.ptr = 10;
>         return sm;  // construct and return mutable object
>     }();
>     static assert(is(typeof(*si.ptr) == immutable int));
>     assert(*si.ptr == 10);
> }
>
> The local function would return an unique object, so it is 
> implicitly
> convertible to immutable.
>
> Kenji Hara

Hm, well the problem isn't to make something mutable into 
immutable, so the purity and implicit conversion is not 
necessary, but using a nested or anonymous function would indeed 
be a good way to move the problematic try-catch into another 
function.