C
C#•3y ago
Thinker

Interfaces containing static abstracts as type arguments

So curiously, this works 
public interface IFoo
{
    static abstract IFoo Create();
}
public interface IFoo
{
    static abstract IFoo Create();
}
but these don't 
public interface IBar
{
    static abstract Task<IBar> CreateAsync();
}
public interface IBar
{
    static abstract Task<IBar> CreateAsync();
}
public interface IBar<TSelf> where TSelf : IBar<TSelf>
{
    static abstract Task<IBar<TSelf>> CreateAsync();
}
public interface IBar<TSelf> where TSelf : IBar<TSelf>
{
    static abstract Task<IBar<TSelf>> CreateAsync();
}
The interface 'IBar' cannot be used as type argument. Static member 'IBar.CreateAsync()' does not have a most specific implementation in the interface. Is there any way to work around this without using a regular factory interface?
2 Replies
333fred
333fred•3y ago
Just return TSelf from CreateAsync
Thinker
ThinkerOP•3y ago
Oh yeah, right Yeah I'm slowly realizing this use-case isn't even that good

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