ExtraConstraints.Fody

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

See Milestones for release notes.

This is an add-in for Fody

It is expected that all developers using Fody become a Patron on OpenCollective. See Licensing/Patron FAQ for more information.

Usage

See also Fody usage.

NuGet installation

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

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

The Install-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

<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.