wasSharp
| /Linq.cs |
|---|
| @@ -66,6 +66,50 @@ |
| // Copyright (C) 2017 Wizardry and Steamworks - License: GNU GPLv3 // |
| /////////////////////////////////////////////////////////////////////////// |
| /// <summary> |
| /// A functional implementation of a switch clause. |
| /// </summary> |
| /// <typeparam name="T">the type of the item to query</typeparam> |
| /// <param name="query">the selector query</param> |
| /// <param name="default">the function to execute when no case matches</param> |
| /// <param name="case">a list of predicates representing the switch cases, |
| /// where each predicate has to return True or False indicating whether |
| /// fallthrough should occur. |
| /// </param> |
| /// <remarks>when used, the default action must be explicitly specified |
| /// due to language restrictions |
| /// </remarks> |
| public static void Switch<T>(this T query, |
| // default |
| Action<T> @default, |
| // case |
| // case |
| // ... |
| params Predicate<T>[] @case) |
| { |
| if (@case.Length % 2 != 0) |
| throw new ArgumentException("Pairs of predicates expected."); |
| var match = false; |
| for (var i = 0; i < @case.Length; i += 2) |
| { |
| if (!@case[i].Invoke(query)) |
| continue; |
| if (@case[i + 1].Invoke(query)) |
| return; |
| match = true; |
| } |
| if (!match) |
| @default.Invoke(query); |
| } |
| /////////////////////////////////////////////////////////////////////////// |
| // Copyright (C) 2017 Wizardry and Steamworks - License: GNU GPLv3 // |
| /////////////////////////////////////////////////////////////////////////// |
| /// <summary> |
| /// Invokes pf in case the predicate p resolves or qf in case the predicate q resolves, or ef otherwise. |
| /// </summary> |
| /// <typeparam name="T">the type of items in the query</typeparam> |