[Add] Unitask

Assets/Plugins/UniTask/Runtime/Triggers/AsyncStartTrigger.cs

@@ -0,0 +1,38 @@
+#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
+
+using UnityEngine;
+
+namespace Cysharp.Threading.Tasks.Triggers
+{
+    public static partial class AsyncTriggerExtensions
+    {
+        public static AsyncStartTrigger GetAsyncStartTrigger(this GameObject gameObject)
+        {
+            return GetOrAddComponent<AsyncStartTrigger>(gameObject);
+        }
+
+        public static AsyncStartTrigger GetAsyncStartTrigger(this Component component)
+        {
+            return component.gameObject.GetAsyncStartTrigger();
+        }
+    }
+
+    [DisallowMultipleComponent]
+    public sealed class AsyncStartTrigger : AsyncTriggerBase<AsyncUnit>
+    {
+        bool called;
+
+        void Start()
+        {
+            called = true;
+            RaiseEvent(AsyncUnit.Default);
+        }
+
+        public UniTask StartAsync()
+        {
+            if (called) return UniTask.CompletedTask;
+
+            return ((IAsyncOneShotTrigger)new AsyncTriggerHandler<AsyncUnit>(this, true)).OneShotAsync();
+        }
+    }
+}