RSCG – Immutype

RSCG – Immutype
 
 

Immutable from constructors

This is how you can use Immutype .

The code that you start with is

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net7.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Immutype" Version="1.0.14" OutputItemType="Analyzer" >
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
  </ItemGroup>
	<PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>

</Project>

The code that you will use is

using ImmutypeDemo;

Person p = new("Andrei","Ignat");
var p2= p.WithFirstName("Test");
Console.WriteLine(p2.LastName);

namespace ImmutypeDemo;

[Immutype.Target]
internal class Person
{
    public string? FirstName;
    public Person()
    {
    }
    public Person(string? FirstName,string LastName)
    {
        this.FirstName = FirstName;
        this.LastName = LastName;
    }
    public int ID { get; set; }
    public string? LastName { get; set;}
}

The code that is generated is

// ReSharper disable CheckNamespace
// ReSharper disable ClassNeverInstantiated.Global
namespace Immutype
{
    using System;
    
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Constructor,Inherited = false)]
    public class TargetAttribute: Attribute { }
}

namespace ImmutypeDemo;

using System.Collections.Generic;
using System.Linq;
[System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage] 
internal static partial class PersonExtensions{


[System.Runtime.CompilerServices.MethodImplAttribute((System.Runtime.CompilerServices.MethodImplOptions)256),System.Diagnostics.Contracts.PureAttribute]
public static ImmutypeDemo.Person WithFirstName(this ImmutypeDemo.Person it,string? FirstName){
if( it==default(ImmutypeDemo.Person))throw new System.ArgumentNullException("it");
return new ImmutypeDemo.Person(FirstName,it.LastName );}

[System.Runtime.CompilerServices.MethodImplAttribute((System.Runtime.CompilerServices.MethodImplOptions)256),System.Diagnostics.Contracts.PureAttribute]
public static ImmutypeDemo.Person WithLastName(this ImmutypeDemo.Person it,string LastName){
if( it==default(ImmutypeDemo.Person))throw new System.ArgumentNullException("it");
if(LastName==default(string ))throw new System.ArgumentNullException("LastName");
return new ImmutypeDemo.Person( it.FirstName,LastName);}}

Code and pdf at

https://ignatandrei.github.io/RSCG_Examples/v2/docs/Immutype