// @nuget: StructureMap -Version 4.7.0

using System;

using StructureMap;

public class Program

{

    public static void Main()

    {

        var container = new Container();

        container.Configure(x =>

        {

            x.For<SingletonConcreteType>().Singleton();

            x.For<ISingleton>().Singleton().Use<SingletonTypeThatDependsOnNonSingleton>();

        });

        var instance1 = container.GetInstance<SingletonConcreteType>();

        var instance2 = container.GetInstance<SingletonConcreteType>();

        Console.WriteLine(instance1 == instance2);

        Console.WriteLine(instance1.Id == instance2.Id);

        var instance3 = container.GetInstance<ConcreteType>();

        var instance4 = container.GetInstance<ConcreteType>();

​

        Console.WriteLine(instance3.Id == instance4.Id);

        // When using a singleton that depends on a non singleton, the non singleton is constructed once

        Console.WriteLine(container.GetInstance<ISingleton>().Id == container.GetInstance<ISingleton>().Id);

    }

    public class SingletonConcreteType

    {

        public Guid Id = Guid.NewGuid();    

    }

    public class ConcreteType

    {

        public Guid Id = Guid.NewGuid();

    }

    public interface ISingleton

    {

        Guid Id { get; }

    }

    public class SingletonTypeThatDependsOnNonSingleton : ISingleton

    {

        public Guid Id { get { return ct.Id; } }

        public ConcreteType ct;

        public SingletonTypeThatDependsOnNonSingleton(ConcreteType c)

        {

            ct = c;

        }

    }

}