namespace EleCho.WpfSuite
{
	/// <summary>
	/// Base class of singleton multi value converter
	/// </summary>
	/// <typeparam name="TSelf"></typeparam>
	public abstract class SingletonMultiValueConverterBase<TSelf> : MultiValueConverterBase<TSelf>
		where TSelf : SingletonMultiValueConverterBase<TSelf>, new()
	{
		private static TSelf? _instance = null;

		/// <summary>
		/// Get an instance of <typeparamref name="TSelf"/>
		/// </summary>
		public static TSelf Instance => _instance ?? new();
	}
}