DefaultConstructor

DefaultConstructor.Create(type) creates constructor for default value. Value-type can always be constructed with default values, and no-args constructor classes.

// Create writer
IWriterToRef<Avalanche.Void, MyStruct> defaultConstructor =
    (IWriterToRef<Avalanche.Void, MyStruct>)
    DefaultConstructor.Create(typeof(MyStruct));
// Create instance
MyStruct o = defaultConstructor.Read(default);

Constructor writer can created with specific constructor method and constant arguments.

// Get .ctor
ConstructorInfo ci = typeof(MyClass).GetConstructor(new Type[] { typeof(int) })!;
// Assign inital args
object[] arguments = new object[] { 5 };
// Create writer
IWriterToRef<Avalanche.Void, MyClass> defaultConstructor =
    (IWriterToRef<Avalanche.Void, MyClass>)
    DefaultConstructorCtor.Create(typeof(MyClass), ci, arguments);
// Create instance
MyClass o = defaultConstructor.Read(default);

DefaultConstructorRequest(target) is request for default constructor. Handlers can participate in this request.

// Create service
IService service = Services.Create(Avalanche.Writer.Module.Instance, CachePolicies.Default);
// Create request
IRequestFor<IWriter> request = new DefaultConstructorRequest(typeof(MyStruct));
// Create passthrough writer
IWriterToRef<Avalanche.Void, MyStruct> writer =
    service.GetRequired<IRequest, IWriterToRef<Avalanche.Void, MyStruct>>(request);
// Create struct
MyStruct i = writer.Read(default);

DefaultConstructorArray.Create(arrayType) creates empty array constructor.

// Create writer
IWriterToRef<Avalanche.Void, int[]> defaultConstructor =
    (IWriterToRef<Avalanche.Void, int[]>)
    DefaultConstructorArray.Create(typeof(int[]));
// Create empty array
int[] array = defaultConstructor.Read(default);

public record MyClass(int x);
public record struct MyStruct(int x);

Full Example

Full example

using System;
using System.Reflection;
using Avalanche.Service;
using Avalanche.Writer;

public class defaultconstructor
{
    public static void Run()
    {
        {
            // <01>
            // Create writer
            IWriterToRef<Avalanche.Void, int[]> defaultConstructor =
                (IWriterToRef<Avalanche.Void, int[]>)
                DefaultConstructorArray.Create(typeof(int[]));
            // Create empty array
            int[] array = defaultConstructor.Read(default);
            // </01>
        }
        {
            // <03>
            // Create writer
            IWriterToRef<Avalanche.Void, MyStruct> defaultConstructor =
                (IWriterToRef<Avalanche.Void, MyStruct>)
                DefaultConstructor.Create(typeof(MyStruct));
            // Create instance
            MyStruct o = defaultConstructor.Read(default);
            // </03>
        }
        {
            // <04>
            // Get .ctor
            ConstructorInfo ci = typeof(MyClass).GetConstructor(new Type[] { typeof(int) })!;
            // Assign inital args
            object[] arguments = new object[] { 5 };
            // Create writer
            IWriterToRef<Avalanche.Void, MyClass> defaultConstructor =
                (IWriterToRef<Avalanche.Void, MyClass>)
                DefaultConstructorCtor.Create(typeof(MyClass), ci, arguments);
            // Create instance
            MyClass o = defaultConstructor.Read(default);
            // </04>
        }

        {
            // <11>
            // Create service
            IService service = Services.Create(Avalanche.Writer.Module.Instance, CachePolicies.Default);
            // Create request
            IRequestFor<IWriter> request = new DefaultConstructorRequest(typeof(MyStruct));
            // Create passthrough writer
            IWriterToRef<Avalanche.Void, MyStruct> writer =
                service.GetRequired<IRequest, IWriterToRef<Avalanche.Void, MyStruct>>(request);
            // Create struct
            MyStruct i = writer.Read(default);
            // </11>
        }
    }

    // <00>
    public record MyClass(int x);
    public record struct MyStruct(int x);
    // </00>
}