EnumValues

    // Author contact: piecesof8bitgame@gmail.com

    /// <summary>
    /// Helper to create and cache an array of all values of the specified enum type
    /// Avoids constant garbage allocation from evaluating Enum.GetValues every time we want all values
    /// </summary>
    /// <typeparam name="TEnum">Type of an enum to use</typeparam>
    public static class EnumValues<TEnum>
        where TEnum : struct, IComparable, IConvertible, IFormattable
    {
        private static TEnum[] GetValues()
        {
            var values = Enum.GetValues(typeof(TEnum));

            var array = new TEnum[values.Length];
            for (var i = 0; i < values.Length; i++)
            {
                array[i] = (TEnum) values.GetValue(i);
            }
            return array;
        }

        // NB: .NET 4.6 only; use a property with a private readonly backing field for .NET 3.5
        public static TEnum[] Values { get; } = GetValues();
    }