README.md

✨ Features

• ✔️ The best CreateInstance ever

  • Up to 50x faster than Activator.CreateInstance<T>
  • Generic Parameters Support
  • Zero boxing/unboxing
  • TryGetValue-like TryFastNew API
  • Link Mode PublishTrimmed Support
  • Non-Public Constructor Support
  • No Generic Constraints
  • Compatible with .NET Standard 2.0
  • Multiple backend implementations
  • Heavily tested on Win/Mac/Linux

• 🪛 Modern Compiler Integration

  • Source Generator v2 (Incremental Generator)
  • Highly Configurable (Props)
  • Multi-threaded Generation

• 🔥 Latest C#/.NET Features Support

  • C# 8 Nullable Support
  • C# 10 Parameterless struct constructors Support (Both invokes or not)
  • WebAssembly Support

🔧 Installation

You should only use one of them

Pre-Compiled Version

dotnet add package FastGenericNew --version 3.3.1

<ItemGroup>
  <PackageReference Include="FastGenericNew" Version="3.3.1" />
</ItemGroup>

SourceGenerator Version

dotnet add package FastGenericNew.SourceGenerator --version 3.3.1

<ItemGroup>
  <PackageReference Include="FastGenericNew.SourceGenerator" Version="3.3.1" />
</ItemGroup>

SourceGeneratorV2 requires

.NET Standard 2.0 or above
C# 8.0 or above
Roslyn 4.0.1 or above
Modern IDE (Optional) [VS2022, Rider, VSCode]

📖 Examples

using FastGenericNew;

// Simply replace 'Activator' to 'FastNew'
var obj = FastNew.CreateInstance<T>();

// With parameter(s)
var obj2 = FastNew.CreateInstance<T, string>("text");
var obj3 = FastNew.CreateInstance<T, string, int>("text", 0);

// Try pattern
// NOTE: The try pattern will only check if the constructor can be called.
//       It will not catch or handle any exceptions thrown in the constructor.
if (FastNew.TryCreateInstance<T, string>("arg0", out T result));
{
    // ...
}

Notes

With .NET Framework, Activator.CreateInstance<T>() invokes the parameterless constructor of ValueType if
the constraint is where T : new() but appears to ignore the parameterless constructor if the constraint is where T : struct.
But FastNew.CreateInstance<T>() will always invoke the parameterless constructor if it's available.

If you don't want to invoke the parameterless constructor of ValueType, consider using FastNew.NewOrDefault<T>() which will never invoke the parameterless constructor of ValueType

🚀 Benchmark

Check the full benchmark results here:
https://github.com/Nyrest/FastGenericNew/blob/main/benchmark_results.md

Environment

BenchmarkDotNet v0.14.0, Windows 11 (10.0.22631.3958/23H2/2023Update/SunValley3)
AMD Ryzen 9 3900X, 1 CPU, 24 logical and 12 physical cores
.NET SDK 9.0.100-preview.7.24407.12
  [Host]     : .NET 8.0.3 (8.0.324.11423), X64 RyuJIT AVX2
  Job-GFVMQQ : .NET 5.0.17 (5.0.1722.21314), X64 RyuJIT AVX2
  Job-FGYWFO : .NET 6.0.33 (6.0.3324.36610), X64 RyuJIT AVX2
  Job-LODQQQ : .NET 8.0.3 (8.0.324.11423), X64 RyuJIT AVX2
  Job-NXJWMD : .NET 9.0.0 (9.0.24.40507), X64 RyuJIT AVX2
  Job-VBBRLS : .NET Framework 4.8.1 (4.8.9256.0), X64 RyuJIT VectorSize=256

Reference Types

Value Types

📜 License

FastGenericNew is licensed under the MIT license.