TypeCast

.TypeCast<From, To>() and .TypeCast(fromType, toType) type-casts writer 'From' and 'To' types with implicit type-casting.

If value types are casted into object, then caster refers inside box.

// Create reader
IWriterFromRefToRef<MyStruct, string> labelReader = DelegateWriter.Reader((ref MyStruct myStruct) => myStruct.Label);
// Create writer
IWriterFromRef<string, MyStruct> labelWriter = DelegateWriter.Writer((string label, ref MyStruct myStruct) => myStruct.Label = label);

// Convert to box reader
IWriterToRef<object, string> boxLabelReader =
    (IWriterToRef<object, string>)
    labelReader.TypeCast<object, string>();
// Convert to box writer
IWriter<string, object> boxLabelWriter =
    (IWriter<string, object>)
    labelWriter.TypeCast(typeof(string), typeof(object));

// Create struct
MyStruct myStruct = new MyStruct("Label");
// Copy to heap
object box = myStruct;

// Write to box
boxLabelWriter.Write("NewLabel", box);
// Read from box
string label = boxLabelReader.Read(box);

Cast

.CastFrom<NewFrom>(casterOldFromToNewFrom), .CastFrom(newFromType, casterOldFromToNewFrom) casts 'From' type by forwarding casting to sub-writer.

// Create Int32 parser
IWriterToRef<string, int> int32parser = DelegateWriter.Reader((string str) => int.Parse(str));
// Create Int32 printer
IWriterToRef<int, string> int32printer = DelegateWriter.Reader((int value) => value.ToString());

// Create writer
IWriterFromRef<string, MyStruct> labelWriter = DelegateWriter.Writer((string label, ref MyStruct myStruct) => myStruct.Label = label);

// Cast to int32 writer of Label:string on MyStruct
IWriterFromRefToRef<int, MyStruct> labelIntWriter =
    (IWriterFromRefToRef<int, MyStruct>)
    labelWriter.CastFrom(typeof(int), int32printer, int32parser);

// Create struct
MyStruct myStruct = new MyStruct("100");
// Write label with integer
labelIntWriter.Write(200, ref myStruct);

.CastTo<NewTo>(casterOldToToNewTo, casterNewToToOldTo?), .CastTo(newToType, casterOldToToNewTo, casterNewToToOldTo?) casts 'To' type.

// Create Int32 parser
IWriterToRef<string, int> int32parser = DelegateWriter.Reader((string str) => int.Parse(str));
// Create Int32 printer
IWriterToRef<int, string> int32printer = DelegateWriter.Reader((int value) => value.ToString());

// Create reader
IWriterFromRefToRef<MyStruct, string> labelReader = DelegateWriter.Reader((ref MyStruct myStruct) => myStruct.Label);

// Cast to int32 reader of Label:string on MyStruct
IWriterFromRefToRef<MyStruct, int> labelIntReader =
    (IWriterFromRefToRef<MyStruct, int>)
    labelReader.CastTo(typeof(int), int32parser, int32printer);

// Create struct
MyStruct myStruct = new MyStruct("100");
// Read label as integer
int label = labelIntReader.Read(ref myStruct);

.CastFromAndTo<NewFrom, NewTo>() type-casts writer 'From' and 'To' types by forwarding casting to a sub-writers.

// Create Int32 parser
IWriterToRef<string, int> int32parser = DelegateWriter.Reader((string str) => int.Parse(str));
// Create Int32 printer
IWriterToRef<int, string> int32printer = DelegateWriter.Reader((int value) => value.ToString());
// Create Boxer
IWriterToRef<object, MyStruct> myStructUnboxer = (IWriterToRef<object, MyStruct>)TypeCastT.Create<object, MyStruct>();
// Create Unboxer
IWriterToRef<MyStruct, object> myStructBoxer = (IWriterToRef<MyStruct, object>)TypeCastT.Create<MyStruct, object>();

// Create writer
IWriterFromRef<string, MyStruct> labelWriter = DelegateWriter.Writer((string label, ref MyStruct myStruct) => myStruct.Label = label);

// 
IWriterToRef<int, object> boxLabelIntWriter =
    (IWriterToRef<int, object>)
    labelWriter.CastFromAndTo(
        newFrom: typeof(int),
        newTo: typeof(object),
        casterNewFromToOldFrom: int32printer,
        casterOldToToNewTo: myStructBoxer,
        casterNewToToOldTo: myStructUnboxer,
        casterOldFromToNewFrom: int32parser);

// Create struct
MyStruct myStruct = new MyStruct("100");
// Box it
object box = myStruct;
// Writer label as integer
boxLabelIntWriter.Write(25, ref box);

Full Example

Full example

using Avalanche.Service;
using Avalanche.Writer;
using Avalanche.Writer.Cast;

public class typecast
{
    public static void Run()
    {
        {
            // <01>
            // Create reader
            IWriterFromRefToRef<MyStruct, string> labelReader = DelegateWriter.Reader((ref MyStruct myStruct) => myStruct.Label);
            // Create writer
            IWriterFromRef<string, MyStruct> labelWriter = DelegateWriter.Writer((string label, ref MyStruct myStruct) => myStruct.Label = label);

            // Convert to box reader
            IWriterToRef<object, string> boxLabelReader =
                (IWriterToRef<object, string>)
                labelReader.TypeCast<object, string>();
            // Convert to box writer
            IWriter<string, object> boxLabelWriter =
                (IWriter<string, object>)
                labelWriter.TypeCast(typeof(string), typeof(object));

            // Create struct
            MyStruct myStruct = new MyStruct("Label");
            // Copy to heap
            object box = myStruct;

            // Write to box
            boxLabelWriter.Write("NewLabel", box);
            // Read from box
            string label = boxLabelReader.Read(box);
            // </01>
        }

        {
            // <11>
            // Create Int32 parser
            IWriterToRef<string, int> int32parser = DelegateWriter.Reader((string str) => int.Parse(str));
            // Create Int32 printer
            IWriterToRef<int, string> int32printer = DelegateWriter.Reader((int value) => value.ToString());

            // Create writer
            IWriterFromRef<string, MyStruct> labelWriter = DelegateWriter.Writer((string label, ref MyStruct myStruct) => myStruct.Label = label);

            // Cast to int32 writer of Label:string on MyStruct
            IWriterFromRefToRef<int, MyStruct> labelIntWriter =
                (IWriterFromRefToRef<int, MyStruct>)
                labelWriter.CastFrom(typeof(int), int32printer, int32parser);

            // Create struct
            MyStruct myStruct = new MyStruct("100");
            // Write label with integer
            labelIntWriter.Write(200, ref myStruct);
            // </11>
        }
        {
            // <12>
            // Create Int32 parser
            IWriterToRef<string, int> int32parser = DelegateWriter.Reader((string str) => int.Parse(str));
            // Create Int32 printer
            IWriterToRef<int, string> int32printer = DelegateWriter.Reader((int value) => value.ToString());

            // Create reader
            IWriterFromRefToRef<MyStruct, string> labelReader = DelegateWriter.Reader((ref MyStruct myStruct) => myStruct.Label);

            // Cast to int32 reader of Label:string on MyStruct
            IWriterFromRefToRef<MyStruct, int> labelIntReader =
                (IWriterFromRefToRef<MyStruct, int>)
                labelReader.CastTo(typeof(int), int32parser, int32printer);

            // Create struct
            MyStruct myStruct = new MyStruct("100");
            // Read label as integer
            int label = labelIntReader.Read(ref myStruct);
            // </12>
        }
        {
            // <13>
            // Create Int32 parser
            IWriterToRef<string, int> int32parser = DelegateWriter.Reader((string str) => int.Parse(str));
            // Create Int32 printer
            IWriterToRef<int, string> int32printer = DelegateWriter.Reader((int value) => value.ToString());
            // Create Boxer
            IWriterToRef<object, MyStruct> myStructUnboxer = (IWriterToRef<object, MyStruct>)TypeCastT.Create<object, MyStruct>();
            // Create Unboxer
            IWriterToRef<MyStruct, object> myStructBoxer = (IWriterToRef<MyStruct, object>)TypeCastT.Create<MyStruct, object>();

            // Create writer
            IWriterFromRef<string, MyStruct> labelWriter = DelegateWriter.Writer((string label, ref MyStruct myStruct) => myStruct.Label = label);

            // 
            IWriterToRef<int, object> boxLabelIntWriter =
                (IWriterToRef<int, object>)
                labelWriter.CastFromAndTo(
                    newFrom: typeof(int),
                    newTo: typeof(object),
                    casterNewFromToOldFrom: int32printer,
                    casterOldToToNewTo: myStructBoxer,
                    casterNewToToOldTo: myStructUnboxer,
                    casterOldFromToNewFrom: int32parser);

            // Create struct
            MyStruct myStruct = new MyStruct("100");
            // Box it
            object box = myStruct;
            // Writer label as integer
            boxLabelIntWriter.Write(25, ref box);
            // </13>
        }
    }

    public record struct MyStruct(string Label);
}