anthrax3 / extraconstraints

Facilitates adding constraints for Enum and Delegate to types and methods.

This is an add-in for Fody

Facilitates adding constraints for Enum and Delegate to types and methods.

Introduction to Fody

Usage

See also Fody usage.

NuGet installation

Install the ExtraConstraints.Fody NuGet package and update the Fody NuGet package:

PM> Install-Package ExtraConstraints.Fody
PM> Update-Package Fody

The Update-Package Fody is required since NuGet always defaults to the oldest, and most buggy, version of any dependency.

Add to FodyWeavers.xml

Add <ExtraConstraints/> to FodyWeavers.xml

<?xml version="1.0" encoding="utf-8" ?>
<Weavers>
  <ExtraConstraints/>
</Weavers>

Your Code

public class Sample
{
    public void MethodWithDelegateConstraint<[DelegateConstraint] T> () {...}

    public void MethodWithTypeDelegateConstraint<[DelegateConstraint(typeof(Func<int>))] T> () {...}

    public void MethodWithEnumConstraint<[EnumConstraint] T>() {...}

    public void MethodWithTypeEnumConstraint<[EnumConstraint(typeof(ConsoleColor))] T>() {...}
} 

What gets compiled

public class Sample
{
    public void MethodWithDelegateConstraint<T>() where T: Delegate {...}

    public void MethodWithTypeDelegateConstraint<T>() where T: Func<int> {...}

    public void MethodWithEnumConstraint<T>() where T: struct, Enum {...}

    public void MethodWithTypeEnumConstraint<T>() where T: struct, ConsoleColor {...}
}

Credit

Inspired by Jon Skeets blog post Generic constraints for enums and delegates.

Based mainly on code from Jb Evain's blog post Constraining generic constraints.

Icon

Straightjacket designed by Luis Prado from The Noun Project.