using System;

namespace BizHawk.Common
{
	/// <summary>
	/// interface for a dynamic link library or similar
	/// </summary>
	public interface IImportResolver
	{
		IntPtr Resolve(string entryPoint);
	}

	public static class ImportResolverExtensions
	{
		public static IntPtr SafeResolve(this IImportResolver dll, string entryPoint)
		{
			var ret = dll.Resolve(entryPoint);
			if (ret == IntPtr.Zero)
			{
				throw new NullReferenceException($"Couldn't resolve entry point \"{entryPoint}\"");
			}

			return ret;
		}
	}
}