/// <summary>
/// Creates a new evaluator factory using the specified <paramref name="memoizer"/> to cache the
/// compiled delegates created by <see cref="ShouldCache(MemberInfo)"/>. A weak memoizer is used which
/// can help to prevent the cache from keeping member objects and evaluator delegates alive.
/// </summary>
/// <param name="memoizer">The memoizer to use for caching <see cref="GetEvaluator(MemberInfo)"/> calls.</param>
public MemoizingEvaluatorFactory(IWeakMemoizer memoizer)
{
if (memoizer == null)
{
throw new ArgumentNullException(nameof(memoizer));
}
_getEvaluator = memoizer.MemoizeWeak <MemberInfo, Delegate>(base.GetEvaluator);
}
/// <summary>
/// Memoizes the specified <paramref name="function"/> using the specified <paramref name="memoizer"/>.
/// </summary>
/// <typeparam name="TResult">Type of the function result.</typeparam>
/// <param name="memoizer">The memoizer used to memoize the function.</param>
/// <param name="function">The function to memoize.</param>
/// <param name="options">Flags to influence the memoization behavior.</param>
/// <returns>A memoized delegate containing the memoized function and providing access to the memoization cache.</returns>
public static IMemoizedDelegate <Func <TResult> > MemoizeWeak <TResult>(this IWeakMemoizer memoizer, Func <TResult> function, MemoizationOptions options = MemoizationOptions.None)
{
if (memoizer == null)
{
throw new ArgumentNullException(nameof(memoizer));
}
if (function == null)
{
throw new ArgumentNullException(nameof(function));
}
var res = memoizer.MemoizeWeak <object, TResult>(_ => function(), options);
var del = res.Delegate;
return(new MemoizedDelegate <Func <TResult> >(() => del(null), res.Cache));
}
