ListCount

List counter implements IWriterToRef<List, long>.

IWriterToRef<List<int>, long> listCount;

Creating a writer

ListCount<List, Element> is the default implementation IList<T>.

IWriterToRef<List<int>, long> listCount = new ListCount<List<int>, int>();

ListCount.Create(listType, elementType) also creates the writer.

IWriterToRef<List<int>, long> listCount =
    (IWriterToRef<List<int>, long>)
    ListCount.Create(typeof(List<int>), typeof(int));

List count be adapted from delegate.

IWriterToRef<List<int>, long> listCount =
    DelegateWriter.Reader<List<int>, long>(list => list.Count);

ListCountRequest(Type) is a request to build a list count writer.

ListCountRequest listRequest = new ListCountRequest(typeof(List<int>));
IWriterToRef<List<int>, long> listCount =
    AccessorServices.Instance
    .GetRequired<ListCountRequest, IWriterToRef<List<int>, long>>(listRequest);

Usage

Writer counts number of elements.

List<int> list = new List<int> { 1, 2, 3 };
long count = listCount.Read(list);

A ref must be used when accessing a value-typed list on stack.

// Create writer
IWriterFromRefToRef<StructList4<int>, long> listCount =
    (IWriterFromRefToRef<StructList4<int>, long>)
    ListCount.Create(typeof(StructList4<int>));
// Create list
StructList4<int> list = new StructList4<int> { 1, 2, 3 };
// Get count
long count = listCount.Read(ref list);

.TypeCast<Object, long>().Write() be used when accessing a value-typed list in heap.

// Create writer
IWriterFromRefToRef<StructList4<int>, long> listCount =
    (IWriterFromRefToRef<StructList4<int>, long>)
    ListCount.Create(typeof(StructList4<int>));
// Create list
StructList4<int> list = new StructList4<int> { 1, 2, 3 };
// Copy to heap
object box = list;
// Get count from value-typed list in heap
long count = listCount.TypeCast<object, long>().Read(box);

Full Example

Full example

using System.Collections.Generic;
using Avalanche.Accessor;
using Avalanche.Accessor.List;
using Avalanche.Utilities;
using Avalanche.Writer;

public class listcount
{
    public static void Run()
    {
        {
#pragma warning disable CS0168
            // <01>
            IWriterToRef<List<int>, long> listCount;
            // </01>
#pragma warning restore CS0168
        }
        {
            // <10>
            IWriterToRef<List<int>, long> listCount = new ListCount<List<int>, int>();
            // </10>
            List<int> list = new List<int> { 1, 2, 3 };
            long count = listCount.Read(list);
        }
        {
            // <11>
            IWriterToRef<List<int>, long> listCount =
                (IWriterToRef<List<int>, long>)
                ListCount.Create(typeof(List<int>), typeof(int));
            // </11>
            List<int> list = new List<int> { 1, 2, 3 };
            long count = listCount.Read(list);
        }
        {
            // <12>
            IWriterToRef<List<int>, long> listCount =
                DelegateWriter.Reader<List<int>, long>(list => list.Count);
            // </12>
            List<int> list = new List<int> { 1, 2, 3 };
            long count = listCount.Read(list);
        }

        {
            // <16>
            ListCountRequest listRequest = new ListCountRequest(typeof(List<int>));
            IWriterToRef<List<int>, long> listCount =
                AccessorServices.Instance
                .GetRequired<ListCountRequest, IWriterToRef<List<int>, long>>(listRequest);
            // </16>
            List<int> list = new List<int> { 1, 2, 3 };
            long count = listCount.Read(list);
        }

        {
            IWriterToRef<List<int>, long> listCount = new ListCount<List<int>, int>();

            // <21>
            List<int> list = new List<int> { 1, 2, 3 };
            long count = listCount.Read(list);
            // </21>
        }

        // Value List on stack
        {
            // <30>
            // Create writer
            IWriterFromRefToRef<StructList4<int>, long> listCount =
                (IWriterFromRefToRef<StructList4<int>, long>)
                ListCount.Create(typeof(StructList4<int>));
            // Create list
            StructList4<int> list = new StructList4<int> { 1, 2, 3 };
            // Get count
            long count = listCount.Read(ref list);
            // </30>
        }

        // Value List on heap
        {
            // <31>
            // Create writer
            IWriterFromRefToRef<StructList4<int>, long> listCount =
                (IWriterFromRefToRef<StructList4<int>, long>)
                ListCount.Create(typeof(StructList4<int>));
            // Create list
            StructList4<int> list = new StructList4<int> { 1, 2, 3 };
            // Copy to heap
            object box = list;
            // Get count from value-typed list in heap
            long count = listCount.TypeCast<object, long>().Read(box);
            // </31>
        }
    }

}