improve init-only fields handling, setup bench

FastCloner.Benchmark/FastCloner.Benchmark.csproj

@@ -0,0 +1,25 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <LangVersion>preview</LangVersion>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
+      <PackageReference Include="DeepCloner" Version="0.10.4" />
+      <PackageReference Include="DeepCopier" Version="1.0.4" />
+      <PackageReference Include="DeepCopy" Version="1.0.3" />
+      <PackageReference Include="DeepCopy.Expression" Version="1.4.2" />
+      <PackageReference Include="FastDeepCloner" Version="1.3.6" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\FastCloner.Contrib\FastCloner.Contrib.csproj" />
+      <ProjectReference Include="..\FastCloner\FastCloner.csproj" />
+    </ItemGroup>
+
+</Project>

FastCloner.Benchmark/Minimal.cs

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+using BenchmarkDotNet.Attributes;
+using Force.DeepCloner;
+
+namespace FastCloner.Benchmark;
+
+[RankColumn]
+[Orderer(BenchmarkDotNet.Order.SummaryOrderPolicy.FastestToSlowest)]
+[MemoryDiagnoser]
+public class Minimal
+{
+    private TestObject testData;
+
+    [GlobalSetup]
+    public void Setup()
+    {
+        testData = new TestObject
+        {
+            Id = 1,
+            Name = "Test",
+            NestedObject = new NestedObject
+            {
+                Value = 42,
+                Description = "Nested test"
+            }
+        };
+    }
+
+    [Benchmark(Baseline = true)]
+    public object? FastCloner()
+    {
+        return global::FastCloner.FastCloner.DeepClone(testData);
+    }
+
+    [Benchmark]
+    public object? DeepCopier()
+    {
+        return global::DeepCopier.Copier.Copy(testData);
+    }
+
+    [Benchmark]
+    public object? DeepCopy()
+    {
+        return global::DeepCopy.DeepCopier.Copy(testData);
+    }
+
+    [Benchmark]
+    public object DeepCopyExpression()
+    {
+        return global::DeepCopy.ObjectCloner.Clone(testData);
+    }
+
+    [Benchmark]
+    public object? FastDeepCloner()
+    {
+        return global::FastDeepCloner.DeepCloner.Clone(testData);
+    }
+
+    [Benchmark]
+    public object? DeepCloner()
+    {
+        return testData.DeepClone();
+    }
+
+    public class TestObject
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public NestedObject NestedObject { get; set; }
+    }
+
+    public class NestedObject
+    {
+        public int Value { get; set; }
+        public string Description { get; set; }
+    }
+}

FastCloner.Benchmark/Program.cs

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+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Configs;
+using BenchmarkDotNet.Reports;
+using BenchmarkDotNet.Running;
+
+namespace FastCloner.Benchmark;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        // this is used only for package "FastDeepCloner" which is not properly packed; todo: fork it and pack for a fair bench
+        ManualConfig config = DefaultConfig.Instance
+            .WithOptions(ConfigOptions.DisableOptimizationsValidator);
+
+        Summary summary = BenchmarkRunner.Run<Minimal>(config);
+        Console.WriteLine(summary);
+    }
+}

FastCloner.SourceGenerator.Console/FastCloner.SourceGenerator.Console.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <LangVersion>preview</LangVersion>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\FastCloner.SourceGenerator\FastCloner.SourceGenerator.csproj"
+                          OutputItemType="Analyzer"
+                          ReferenceOutputAssembly="false" />
+    </ItemGroup>
+
+</Project>

FastCloner.SourceGenerator.Console/Program.cs

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+namespace FastCloner.SourceGenerator.Console;
+using System;
+
+class Program
+{
+
+    public class Person
+    {
+        public string Name { get; set; }
+        public int Age { get; set; }
+        public List<string> Hobbies { get; set; }
+    }
+
+
+    static void Main(string[] args)
+    {
+        Person person = new Person
+        {
+            Name = "John",
+            Age = 30,
+            Hobbies = new List<string> { "Reading", "Gaming" }
+        };
+
+        /*var clone = PersonClone.Clone(person);
+
+        Console.WriteLine($"Original: {person.Name}, {person.Age}");
+        Console.WriteLine($"Clone: {clone.Name}, {clone.Age}");*/
+    }
+}