Mix struct types in the same array

[Laeeth Isharc]

On Wednesday, 18 December 2019 at 22:17:21 UTC, tirithen wrote:
> On Wednesday, 18 December 2019 at 22:11:10 UTC, Sebastiaan 
> Koppe wrote:
>>
>> If you know all types up front you can use the Sumtype library 
>> on code.dlang.org
>
> Thanks, it's a good starting point, the best would be if I only 
> needed to define that the struct would implement void 
> applyTo(ref User user) so that could be run in the loop to 
> update the User entity.
>
> But I'll try the Sumtype library, that takes me forward, thanks 
> for the answer!

https://github.com/atilaneves/concepts

interface IFoo {
     int foo(int i, string s) @safe;
     double lefoo(string s) @safe;
}

@implements!(Foo, IFoo)
struct Foo {
     int foo(int i, string s) @safe { return 0; }
     double lefoo(string s) @safe { return 0; }
}

// doesn't compile
/*
@implements!(Oops, IFoo)
struct Oops {}
*/