Merge pull request #100 from rsdn/feature/array-deconstruct

Enumerable desconstruct

Author: andrewvk

CodeJam.Main.Tests/Collections/Enumerable/EnumerableExtensionTests.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 
 using CodeJam.Strings;
@@ -123,5 +124,53 @@ public void IsLastForEmptyCollections()
 			Assert.IsFalse(enSrc.IsLast("C", null), "#A07");
 			Assert.IsFalse(enSrc.IsLast("C", StringComparer.OrdinalIgnoreCase), "#A08");
 		}
+
+		[Test]
+		public void DeconstructArray()
+		{
+			var array = new[] { 1, 2, 3, 4, 5 };
+			Assert.IsTrue(array is (1, _, _, _, _));
+			Assert.IsFalse(array is (2, _, _, _, _));
+			Assert.IsTrue(array is (_, _, 3, _, _));
+			Assert.IsFalse(array is (_, _, 5, _, _));
+			Assert.IsTrue(array is (1, _, 3, _, _));
+			Assert.IsFalse(array is (1, _, 5, _, _));
+			Assert.IsTrue(array is (1, 2, 3, 4, 5));
+			Assert.IsFalse(array is (1, 2, 3, 6, 5));
+		}
+
+		[Test]
+		public void DeconstructList()
+		{
+			IList<int> array = new[] { 1, 2, 3, 4, 5 };
+			Assert.IsTrue(array is (1, _, _, _, _));
+			Assert.IsFalse(array is (2, _, _, _, _));
+			Assert.IsTrue(array is (_, _, 3, _, _));
+			Assert.IsFalse(array is (_, _, 5, _, _));
+			Assert.IsTrue(array is (1, _, 3, _, _));
+			Assert.IsFalse(array is (1, _, 5, _, _));
+			Assert.IsTrue(array is (1, 2, 3, 4, 5));
+			Assert.IsFalse(array is (1, 2, 3, 6, 5));
+		}
+
+		[Test]
+		public void DeconstructEnumerable()
+		{
+			IEnumerable<int> array = new[] { 1, 2, 3, 4, 5 };
+			Assert.IsTrue(array is (1, _, _, _, _));
+			Assert.IsFalse(array is (2, _, _, _, _));
+			Assert.IsTrue(array is (_, _, 3, _, _));
+			Assert.IsFalse(array is (_, _, 5, _, _));
+			Assert.IsTrue(array is (1, _, 3, _, _));
+			Assert.IsFalse(array is (1, _, 5, _, _));
+			Assert.IsTrue(array is (1, 2, 3, 4, 5));
+			Assert.IsFalse(array is (1, 2, 3, 6, 5));
+
+			Assert.Throws<ArgumentException>(
+				() =>
+				{
+					var b = array is (1, _, _, _, _, _);
+				});
+		}
 	}
 }

CodeJam.Main/CodeJam.Main.csproj

@@ -128,6 +128,11 @@
 			<DependentUpon>Algorithms.EqualRange.tt</DependentUpon>
 			<AutoGen>True</AutoGen>
 		</Compile>
+		<Compile Update="Collections\Enumerable\EnumerableExtensions.Deconstruct.generated.cs">
+		  <DesignTime>True</DesignTime>
+		  <AutoGen>True</AutoGen>
+		  <DependentUpon>EnumerableExtensions.Deconstruct.tt</DependentUpon>
+		</Compile>
 		<Compile Update="Dates\DateTimeCode.generated.cs">
 			<AutoGen>True</AutoGen>
 			<DependentUpon>DateTimeCode.tt</DependentUpon>
@@ -180,6 +185,10 @@
 			<AutoGen>True</AutoGen>
 			<DependentUpon>DebugCode.tt</DependentUpon>
 		</Compile>
+		<None Update="Collections\Enumerable\EnumerableExtensions.Deconstruct.tt">
+		  <Generator>TextTemplatingFileGenerator</Generator>
+		  <LastGenOutput>EnumerableExtensions.Deconstruct.generated.cs</LastGenOutput>
+		</None>
 		<None Update="Dates\DateTimeCode.tt">
 			<LastGenOutput>DateTimeCode.generated.cs</LastGenOutput>
 			<Generator>TextTemplatingFileGenerator</Generator>
@@ -215,6 +224,7 @@
 		<Compile Update="Collections\Array\ArrayExtensions.generated.cs">
 			<DependentUpon>ArrayExtensions.tt</DependentUpon>
 			<AutoGen>True</AutoGen>
+			<DesignTime>True</DesignTime>
 		</Compile>
 		<None Update="Collections\Array\ArrayExtensions.tt">
 			<Generator>TextTemplatingFileGenerator</Generator>