using System.Diagnostics.CodeAnalysis;

namespace InnovEnergy.Lib.Utils;

public static class NullableUtilsClass
{
    public static IEnumerable<T> ToEnumerable<T>(this T? t) where T : class
    {
        if (t is not null)
            yield return t;
    }

    public static T ThrowIfNull<T>(this T? t) where T : class => ThrowIfNull(t, null);

    public static T ThrowIfNull<T>(this T? t, String? message) where T : class
    {
        if (t is null)
            throw new NullReferenceException(message);

        return t;
    }
    
    public static Boolean IsNull<T>([NotNullWhen(returnValue: false)] this T? t) where T : class => t is null;
    
    public static T? As<T>(this Object t) where T : class => t as T;
}