IsNullOrEmpty

Author: migueldeicaza

NStack/NStack.csproj

@@ -3,7 +3,7 @@
   <Import Project="..\packages\NuGet.Build.Packaging.0.1.248\build\NuGet.Build.Packaging.props" Condition="Exists('..\packages\NuGet.Build.Packaging.0.1.248\build\NuGet.Build.Packaging.props')" />
 
   <PropertyGroup>
-    <TargetFramework>netstandard1.5</TargetFramework>
+    <TargetFramework>netstandard1.6</TargetFramework>
     <PackageId>NStack.Core</PackageId>
     <PackageVersion>0.8</PackageVersion>
     <Authors>Miguel de Icaza</Authors>
@@ -26,15 +26,20 @@ It starts with a new string type that is focused on Unicode code-points as oppos
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <DocumentationFile>bin\Debug\netstandard1.6\NStack.xml</DocumentationFile>
+    <LangVersion>Latest</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <LangVersion>Latest</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System.ValueTuple">
       <HintPath>..\packages\System.ValueTuple.4.3.1\lib\netstandard1.0\System.ValueTuple.dll</HintPath>
       <Private>False</Private>
     </Reference>
   </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="System.Memory" Version="4.5.0-preview1-26216-02" />
+  </ItemGroup>
   <Import Project="..\packages\NuGet.Build.Packaging.0.1.248\build\NuGet.Build.Packaging.targets" Condition="Exists('..\packages\NuGet.Build.Packaging.0.1.248\build\NuGet.Build.Packaging.targets')" />
 </Project>

NStack/strings/ustring.cs

@@ -2094,6 +2094,14 @@ public ustring Replace (ustring oldValue, ustring newValue, int maxReplacements
 			return new ByteBufferUString (result);
 		}
 
+		public static bool IsNullOrEmpty (ustring value)
+		{
+			if (value == null)
+				return true;
+			if (value.Length == 0)
+				return true;
+			return false;
+		}
 
 		TypeCode IConvertible.GetTypeCode ()
 		{

NStack/unicode/Rune.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Runtime.InteropServices;
 
 namespace System {
 	/// <summary>
@@ -7,6 +8,7 @@ namespace System {
 	/// <remarks>
 	/// 
 	/// </remarks>
+	[StructLayout(LayoutKind.Sequential)]
 	public partial struct Rune {
 		// Stores the rune
 		uint value;