How to assign a function to UnityEvent without the use of lambdas?

Question

I have a piece of C# code which I am to convert into C++/CLI for the purpose of connecting C# with C++. Here's the code:-

 using UnityEngine;
 using UnityEngine.Events;
 
 public class A
 {
     public void Func1(int index)
     {
 
     }
     public void Func2()
     {
 
     }
 }
 
 public class B : MonoBehaviour
 {
     UnityEvent event;
 
     private void Start()
     {
         A aClass = new A();
 
         event.AddListener(() => A.Func1(index));         // This event needs to be without lambdas
         event.AddListener(A.Func2);
     }
 }

Since I am going to convert this code to C++/CLI, I won't be able to use lambdas as they are not allowed. I also need to pass the specific index that is to be determined by Start(), so I cannot access the index from other functions too.

EDIT: I can't use local functions too but since they are not allowed in C++/CLI.

Answer 1

Answer by Monsoonexe · May 29, 2021 at 06:43 PM

Consider a local function:

 using UnityEngine;
  using UnityEngine.Events;
  
  public class A
  {
      public void Func1(int index)
      {
  
      }
      public void Func2()
      {
  
      }
  }
  
  public class B : MonoBehaviour
  {
      UnityEvent event;
      int index;
  
      private void Start()
      {
          A aClass = new A();
 
          void LocalFunction()
          {     //very similar in behaviour to a lambda, but is not anonymous.
              aClass.Func1(index)
          }
 
          event.AddListener(LocalFunction);
      }
  }

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HitarthPadaliya · May 30, 2021 at 05:38 AM 0

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@Monsoonexe I tried using local functions. They work fine in C# but they too are not allowed in C++/CLI.

How to assign a function to UnityEvent without the use of lambdas?

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