using System;
using System.Linq;

public static class Enum<T> where T : struct, IComparable, IFormattable, IConvertible
{
    private static T[] _values;

    static Enum() {
        if(!typeof(T).IsEnum) throw new ArgumentException("T must be an enumerated type!");
    }

    public static T[] GetValues() => _values ?? (_values = Enum.GetValues(typeof(T)).Cast<T>().ToArray());

    public static T Parse(string value) => (T)Enum.Parse(typeof(T), value);
}