/// <summary>
/// Maps a function over a set and returns a dictionary-based result
/// </summary>
/// <typeparam name="X">The function input type</typeparam>
/// <typeparam name="Y">The function output type</typeparam>
/// <param name="values">The values to be evaluated</param>
/// <param name="f">The evaulator</param>
/// <param name="PLL">Whether to evaulate concurrently</param>
/// <returns></returns>
public static IReadOnlyDictionary <X, Y> eval <X, Y>(IReadOnlySet <X> values, Func <X, Y> f, bool PLL = true)
{
if (PLL)
{
var data = new ConcurrentDictionary <X, Y>();
values.AsParallel().ForAll(p => data[p] = f(p));
return(data);
}
else
{
return(dict(map(values, p => (p, f(p)))));
}
}