Extended Thread Pool

using System;
using System.Collections.Generic;
using System.Linq;
using Nelibur.Sword.DataStructures;

namespace Nelibur.Sword.Extensions
{
    public static class EnumerableExtensions
    {
        public static List<TResult> ConvertAll<TFrom, TResult>(
            this IEnumerable<TFrom> value, Func<TFrom, TResult> converter)
        {
            return value.Select(converter).ToList();
        }

        public static bool IsNullOrEmpty<T>(this IEnumerable<T> value)
        {
            return value.IsNull() || !value.Any();
        }

        /// <summary>
        ///     Apply the given function to each element of the collection
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="value">Input collection</param>
        /// <param name="action">Given function</param>
        public static void Iter<T>(this IEnumerable<T> value, Action<T> action)
        {
            foreach (T item in value)
            {
                action(item);
            }
        }

        /// <summary>
        ///     Apply the given function to each element of the collection.
        ///     The integer passed to the function indicates the index of element.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="value">Input collection</param>
        /// <param name="action">Given function</param>
        public static void IterI<T>(this IEnumerable<T> value, Action<int, T> action)
        {
            int i = 0;
            foreach (T item in value)
            {
                action(i++, item);
            }
        }

        /// <summary>
        ///     Apply the given function to each element of the collection
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="value">Input collection</param>
        /// <param name="action">Given function</param>
        /// <param name="exceptionHandler">Exception handler action</param>
        public static void IterSafe<T>(
            this IEnumerable<T> value, Action<T> action, Action<Exception> exceptionHandler = null)
        {
            foreach (T item in value)
            {
                try
                {
                    action(item);
                }
                catch (Exception ex)
                {
                    if (exceptionHandler != null)
                    {
                        exceptionHandler(ex);
                    }
                }
            }
        }

        public static IEnumerable<T> ToValue<T>(this IEnumerable<Option<T>> value)
        {
            return value.Where(x => x.HasValue)
                        .Select(x => x.Value);
        }
    }
}