RSCG – LinqGen.Generator

RSCG – LinqGen.Generator
 
 

name	LinqGen.Generator
nuget	https://www.nuget.org/packages/LinqGen.Generator/ https://www.nuget.org/packages/LinqGen/
link	https://github.com/cathei/LinqGen
author	Maxwell Keonwoo Kang

No-alloc for Linq operations

 

This is how you can use LinqGen.Generator .

The code that you start with is

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

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="LinqGen" Version="0.3.1" />
    <PackageReference Include="LinqGen.Generator" Version="0.3.1" />
  </ItemGroup>
	<PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>
</Project>

The code that you will use is

using Cathei.LinqGen;
int[] a= [1,2,3];
var s = a
    .Select(x => x * x)
    .Where(it => it < 8)
    .Sum()
;

var result = a.Gen()
                  .Select(x => x * x)
                  .Where(it => it < 8)
                  .Sum();

Console.WriteLine(s == result);

 

The code that is generated is

// DO NOT EDIT
// Generated by LinqGen.Generator
#nullable disable
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using Cathei.LinqGen;
using Cathei.LinqGen.Hidden;

namespace Cathei.LinqGen.Hidden
{
    // Non-exported Enumerable should consider anonymous type, thus it will be internal
    internal struct Gen_wRtaM3 : IInternalStub<int>
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        internal Gen_wRtaM3(int[] source_wRtaM3) : this()
        {
            this.source_wRtaM3 = source_wRtaM3;
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public int Count() => this.source_wRtaM3.Length;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public Select_6q5z23 Select(Func<int, int> selector_6q5z23) => new Select_6q5z23(this, selector_6q5z23);
        [EditorBrowsable(EditorBrowsableState.Never)]
        internal int[] source_wRtaM3;
    }
}

namespace Cathei.LinqGen
{
    // Extension class needs to be internal to prevent ambiguous resolution
    internal static partial class LinqGenExtensions_Gen_wRtaM3
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static Gen_wRtaM3 Gen(this int[] source_wRtaM3) => new Gen_wRtaM3(source_wRtaM3);
    }
}

// DO NOT EDIT
// Generated by LinqGen.Generator
#nullable disable
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using Cathei.LinqGen;
using Cathei.LinqGen.Hidden;

namespace Cathei.LinqGen.Hidden
{
    // Non-exported Enumerable should consider anonymous type, thus it will be internal
    internal struct Select_6q5z23 : IInternalStub<int>
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        internal Select_6q5z23(in Gen_wRtaM3 source, Func<int, int> selector_6q5z23) : this()
        {
            this.source_wRtaM3 = source.source_wRtaM3;
            this.selector_6q5z23 = selector_6q5z23;
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public int Count() => this.source_wRtaM3.Length;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public Where_kc5pa1 Where(Func<int, bool> predicate_kc5pa1) => new Where_kc5pa1(this, predicate_kc5pa1);
        [EditorBrowsable(EditorBrowsableState.Never)]
        internal int[] source_wRtaM3;
        [EditorBrowsable(EditorBrowsableState.Never)]
        internal Func<int, int> selector_6q5z23;
    }
}

namespace Cathei.LinqGen
{
}

// DO NOT EDIT
// Generated by LinqGen.Generator
#nullable disable
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using Cathei.LinqGen;
using Cathei.LinqGen.Hidden;

namespace Cathei.LinqGen.Hidden
{
    // Non-exported Enumerable should consider anonymous type, thus it will be internal
    internal struct Select_KZ5014 : IInternalStub<int>
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        internal Select_KZ5014(in Where_04jjO source, Func<int, int> selector_KZ5014) : this()
        {
            this.source_wRtaM3 = source.source_wRtaM3;
            this.predicate_04jjO = source.predicate_04jjO;
            this.selector_KZ5014 = selector_KZ5014;
        }

        [EditorBrowsable(EditorBrowsableState.Never)]
        internal int[] source_wRtaM3;
        [EditorBrowsable(EditorBrowsableState.Never)]
        internal Func<int, bool> predicate_04jjO;
        [EditorBrowsable(EditorBrowsableState.Never)]
        internal Func<int, int> selector_KZ5014;
    }
}

namespace Cathei.LinqGen
{
    // Extension class needs to be internal to prevent ambiguous resolution
    internal static partial class LinqGenExtensions_Select_KZ5014
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static int Sum(this Select_KZ5014 source)
        {
            int index_wRtaM3 = default;
            index_wRtaM3 = -1;
            int result_5a0zT4 = default;
            while (true)
            {
                if ((uint)++index_wRtaM3 >= (uint)source.source_wRtaM3.Length)
                    break;
                var current_wRtaM3 = source.source_wRtaM3[index_wRtaM3];
                if (!source.predicate_04jjO.Invoke(current_wRtaM3))
                    continue;
                var current_KZ5014 = source.selector_KZ5014.Invoke(current_wRtaM3);
                result_5a0zT4 += current_KZ5014;
            }

            return result_5a0zT4;
        }
    }
}

// DO NOT EDIT
// Generated by LinqGen.Generator
#nullable disable
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using Cathei.LinqGen;
using Cathei.LinqGen.Hidden;

namespace Cathei.LinqGen.Hidden
{
    // Non-exported Enumerable should consider anonymous type, thus it will be internal
    internal struct Where_kc5pa1 : IInternalStub<int>
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        internal Where_kc5pa1(in Select_6q5z23 source, Func<int, bool> predicate_kc5pa1) : this()
        {
            this.source_wRtaM3 = source.source_wRtaM3;
            this.selector_6q5z23 = source.selector_6q5z23;
            this.predicate_kc5pa1 = predicate_kc5pa1;
        }

        [EditorBrowsable(EditorBrowsableState.Never)]
        internal int[] source_wRtaM3;
        [EditorBrowsable(EditorBrowsableState.Never)]
        internal Func<int, int> selector_6q5z23;
        [EditorBrowsable(EditorBrowsableState.Never)]
        internal Func<int, bool> predicate_kc5pa1;
    }
}

namespace Cathei.LinqGen
{
    // Extension class needs to be internal to prevent ambiguous resolution
    internal static partial class LinqGenExtensions_Where_kc5pa1
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static int Sum(this Where_kc5pa1 source)
        {
            int index_wRtaM3 = default;
            index_wRtaM3 = -1;
            int result_x5AfL3 = default;
            while (true)
            {
                if ((uint)++index_wRtaM3 >= (uint)source.source_wRtaM3.Length)
                    break;
                var current_wRtaM3 = source.source_wRtaM3[index_wRtaM3];
                var current_6q5z23 = source.selector_6q5z23.Invoke(current_wRtaM3);
                if (!source.predicate_kc5pa1.Invoke(current_6q5z23))
                    continue;
                result_x5AfL3 += current_6q5z23;
            }

            return result_x5AfL3;
        }
    }
}

// DO NOT EDIT
// Generated by LinqGen.Generator
#nullable disable
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using Cathei.LinqGen;
using Cathei.LinqGen.Hidden;

namespace Cathei.LinqGen.Hidden
{
    // Non-exported Enumerable should consider anonymous type, thus it will be internal
    internal struct Where_04jjO : IInternalStub<int>
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        internal Where_04jjO(in Gen_wRtaM3 source, Func<int, bool> predicate_04jjO) : this()
        {
            this.source_wRtaM3 = source.source_wRtaM3;
            this.predicate_04jjO = predicate_04jjO;
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public Select_KZ5014 Select(Func<int, int> selector_KZ5014) => new Select_KZ5014(this, selector_KZ5014);
        [EditorBrowsable(EditorBrowsableState.Never)]
        internal int[] source_wRtaM3;
        [EditorBrowsable(EditorBrowsableState.Never)]
        internal Func<int, bool> predicate_04jjO;
    }
}

namespace Cathei.LinqGen
{
}

Code and pdf at

https://ignatandrei.github.io/RSCG_Examples/v2/docs/LinqGen.Generator