RequiredInterfaceAttribute

Description

When a type is marked, all interface implementations of the specified types will be marked.

using System;
using UnityEngine;
using UnityEngine.Scripting;

public class NewBehaviourScript : MonoBehaviour
{
    void Start()
    {
        new Foo();
        new Bar();
        new Jar();
        new GenericFoo<int>();
    }
}

interface IUnused {}

interface IFoo {}

interface IGeneric<T> {}

// Foo will retain IFoo.  IUnused will be removed
[RequiredInterface(typeof(IFoo))]
class Foo : IFoo, IUnused {}

// Bar will retain IGeneric<int> and IGeneric<double>.  IGeneric<string> will be removed
[RequiredInterface(typeof(IGeneric<int>))]
[RequiredInterface(typeof(IGeneric<double>))]
class Bar : IGeneric<int>, IGeneric<string>, IGeneric<double> {}

// Jar will retain IGeneric<int>, IGeneric<string>, and IGeneric<double>
[RequiredInterface(typeof(IGeneric<>))]
class Jar : IGeneric<int>, IGeneric<string>, IGeneric<double> {}

// GenericFoo<T> will retain IGeneric<T>
[RequiredInterface(typeof(IGeneric<>))]
class GenericFoo<T> : IGeneric<T> {}