Add new interface: IStorageIndexer

Signed-off-by: Alexander Karatarakis <alex@karatarakis.com>

src/Numerics/LinearAlgebra/Storage/Indexers/IStorageIndexer.cs

@@ -0,0 +1,28 @@
+namespace MathNet.Numerics.LinearAlgebra.Storage.Indexers
+{
+    /// <summary>
+    ///  Abstract class that defines common features for all storage schemes. 
+    /// </summary>
+    public interface IStorageIndexer
+    {
+        /// <summary>
+        ///  Retrieves the index of the requested element without parameter checking.
+        ///  </summary><param name="row">
+        ///  The row of the element. 
+        ///  </param><param name="column">
+        ///  The column of the element. 
+        ///  </param><returns>
+        ///  The requested index. 
+        /// </returns>
+        int IndexOf(int row, int column);
+
+        /// <summary>
+        ///  Retrieves the index of the requested diagonal element without parameter checking.
+        ///  </summary><param name="row">
+        ///  The row=column of the diagonal element. 
+        ///  </param><returns>
+        ///  The requested index. 
+        /// </returns>
+        int IndexOfDiagonal(int row);
+    }
+}

src/Numerics/Numerics.csproj

@@ -141,6 +141,7 @@
     <Compile Include="Distributions\Multivariate\MatrixNormal.cs" />
     <Compile Include="Distributions\Multivariate\Wishart.cs" />
     <Compile Include="LinearAlgebra\Storage\DenseVectorStorage.cs" />
+    <Compile Include="LinearAlgebra\Storage\Indexers\IStorageIndexer.cs" />
     <Compile Include="LinearAlgebra\Storage\MatrixStorage.Validation.cs" />
     <Compile Include="LinearAlgebra\Complex32\ExtensionMethods.cs" />
     <Compile Include="LinearAlgebra\Complex32\Factorization\Cholesky.cs" />
@@ -480,6 +481,9 @@
   <ItemGroup>
     <None Include="MathNet.Numerics.snk" />
   </ItemGroup>
+  <ItemGroup>
+    <Folder Include="LinearAlgebra\Storage\Indexers\Static\" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
     <PreBuildEvent>