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A reimplementation of C# events for Unity 2020+ that's lighter on GC.
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using System; | |
namespace BeardPhantom.LiteEvent | |
{ | |
public interface ILiteEvent<in TDelegate> where TDelegate : Delegate | |
{ | |
#region Properties | |
int ListenerCount { get; } | |
#endregion | |
#region Methods | |
void Clear(); | |
bool Register(TDelegate listener); | |
bool Unregister(TDelegate listener); | |
#endregion | |
} | |
} |
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using System.Collections.Generic; | |
using UnityEngine.Pool; | |
namespace BeardPhantom.LiteEvent | |
{ | |
public sealed class LiteEvent : ILiteEvent<LiteEvent.OnEventInvoked> | |
{ | |
#region Types | |
public delegate void OnEventInvoked(); | |
#endregion | |
#region Events | |
public event OnEventInvoked Event | |
{ | |
add => Register(value); | |
remove => Unregister(value); | |
} | |
#endregion | |
#region Fields | |
private readonly HashSet<OnEventInvoked> _listeners = new(); | |
#endregion | |
#region Properties | |
public int ListenerCount => _listeners.Count; | |
#endregion | |
#region Methods | |
public void Invoke() | |
{ | |
using (ListPool<OnEventInvoked>.Get(out var listenersCopy)) | |
{ | |
listenersCopy.AddRange(_listeners); | |
foreach (var listener in listenersCopy) | |
{ | |
listener(); | |
} | |
} | |
} | |
public IEnumerable<OnEventInvoked> GetListeners() | |
{ | |
using (ListPool<OnEventInvoked>.Get(out var listeners)) | |
{ | |
foreach (var listener in listeners) | |
{ | |
yield return listener; | |
} | |
} | |
} | |
public void Clear() | |
{ | |
_listeners.Clear(); | |
} | |
public bool Register(OnEventInvoked listener) | |
{ | |
return _listeners.Add(listener); | |
} | |
public bool Unregister(OnEventInvoked listener) | |
{ | |
return _listeners.Remove(listener); | |
} | |
#endregion | |
} | |
public sealed class LiteEvent<TArgs> : ILiteEvent<LiteEvent<TArgs>.OnEventInvoked> | |
{ | |
#region Types | |
public delegate void OnEventInvoked(in TArgs args); | |
#endregion | |
#region Events | |
public event OnEventInvoked Event | |
{ | |
add => Register(value); | |
remove => Unregister(value); | |
} | |
#endregion | |
#region Fields | |
private readonly HashSet<OnEventInvoked> _listeners = new(); | |
#endregion | |
#region Properties | |
public int ListenerCount => _listeners.Count; | |
#endregion | |
#region Methods | |
public IEnumerable<OnEventInvoked> GetListeners() | |
{ | |
using (ListPool<OnEventInvoked>.Get(out var listeners)) | |
{ | |
foreach (var listener in listeners) | |
{ | |
yield return listener; | |
} | |
} | |
} | |
public void Clear() | |
{ | |
_listeners.Clear(); | |
} | |
public bool Register(OnEventInvoked listener) | |
{ | |
return _listeners.Add(listener); | |
} | |
public bool Unregister(OnEventInvoked listener) | |
{ | |
return _listeners.Remove(listener); | |
} | |
public void Invoke(in TArgs args) | |
{ | |
using (ListPool<OnEventInvoked>.Get(out var listenersCopy)) | |
{ | |
listenersCopy.AddRange(_listeners); | |
foreach (var listener in listenersCopy) | |
{ | |
listener.Invoke(in args); | |
} | |
} | |
} | |
#endregion | |
} | |
} |
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