can anybody tell me why

struct S
{
    int x;
    alias x this;
}

void test()
{
    S s;
    s = 8; // this works
    S s = 8 // but this does not?
}

On 5/24/20 6:35 PM, Danni Coy wrote:> can anybody tell me why
>
> struct S
> {
>      int x;
>      alias x this;
> }
>
> void test()
> {
>      S s;
>      s = 8; // this works
>      S s = 8 // but this does not?
> }

alias this is for implicit conversion, which requires an object to convert from. The second case above is about constructing an object.

That's probably why it works that way.

Ali

On Monday, 25 May 2020 at 01:35:47 UTC, Danni Coy wrote:
>     s = 8; // this works
>     S s = 8 // but this does not?
> }

alias this only applies if you already have an object. Construction is too soon.

You can add a constructor to make that work though.

On Monday, 25 May 2020 at 01:35:47 UTC, Danni Coy wrote:
> can anybody tell me why
>
> struct S
> {
>     int x;
>     alias x this;
> }
>
> void test()
> {
>     S s;
>     s = 8; // this works
>     S s = 8 // but this does not?
> }