Validation that all properties were assigned

[POnakS]

Hello, I think this library is good candidate for creating complex objects, i.e.

public ClassA
{  
    public required int Prop1 {get; init;}
    ...
    public required int PropN {get; init;}
}

However using this removes my compile-time safety, i.e. after adding PropN+1 existing builders will just assign default (0 or null) to it, rather than failing at compile time that PropN is not set.

I understand that doing such check at compile time may be not possible, however it would be nice to at least have possibility to do runtime check.

Proposed api:

    [BuilderFor(typeof(ClassA), Strict = true)]
    public partial class ClassABuilder
    {
    }

Then calling .Build() throws if WithPopX was called for each property, if no then it fails with exception.

[MelGrubb]

It's an interesting idea. Because of the way my builders work by recoding funcs rather than actual values, it should be possible to run through the list and see if any of the funcs were never set. I'm going to look into this. I think it might be simpler to make "strict" a parameter to the Build method rather than putting it on the attribute, but I could be convinced either way.

[MelGrubb]

Note to future Mel.
I'd have to leave the backing properties null at first in order to tell if they are ever explicitly set. Then, if "strict" is enabled, check that all properties have a func assigned to them (even if that func itself returns null), and throw if not. Finally, after that check is complete, the Build property would need to null-coalesce the missing funcs with their default value from the current implementation.