UniTask/Assets/UniRx.Async/UniTask.WhenAny.Generated.tt

<#@ template debug="false" hostspecific="false" language="C#" #>
<#@ assembly name="System.Core" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Text" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ output extension=".cs" #>
#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
using System;
using System.Runtime.CompilerServices;
using System.Runtime.ExceptionServices;
using System.Threading;
using UniRx.Async.Internal;

namespace UniRx.Async
{
    public partial struct UniTask
    {
<# for(var i = 2; i <= 15; i++ ) {
    var range = Enumerable.Range(1, i);
    var t = string.Join(", ", range.Select(x => "T" + x));
    var args = string.Join(", ", range.Select(x => $"UniTask<T{x}> task{x}"));
    var targs = string.Join(", ", range.Select(x => $"task{x}"));
    var tresult = string.Join(", ", range.Select(x => $"task{x}.GetAwaiter().GetResult()"));
    var tBool = string.Join(", ", range.Select(x => $"(bool hasResult, T{x} result{x})"));
    var tfield = string.Join(", ", range.Select(x => $"self.t{x}"));
    Func<int, string> getResult = j => string.Join(", ", range.Select(x => (x == j) ? "(true, result)" : "(false, default)"));
#>
        public static UniTask<(int winArgumentIndex, <#= tBool #>)> WhenAny<<#= t #>>(<#= args #>)
        {
            return new UniTask<(int winArgumentIndex, <#= tBool #>)>(new WhenAnyPromise<<#= t #>>(<#= targs #>), 0);
        }

        sealed class WhenAnyPromise<<#= t #>> : IUniTaskSource<(int, <#= tBool #>)>
        {
            int completedCount;
            UniTaskCompletionSourceCore<(int, <#= tBool #>)> core;

            public WhenAnyPromise(<#= args #>)
            {
                TaskTracker2.TrackActiveTask(this, 3);

                this.completedCount = 0;
<# for(var j = 1; j <= i; j++) { #>
                {
                    var awaiter = task<#= j #>.GetAwaiter();

                    if (awaiter.IsCompleted)
                    {
                        TryInvokeContinuationT<#= j #>(this, awaiter);
                    }
                    else
                    {
                        awaiter.SourceOnCompleted(state =>
                        {
                            using (var t = (StateTuple<WhenAnyPromise<<#= t #>>, UniTask<T<#= j #>>.Awaiter>)state)
                            {
                                TryInvokeContinuationT<#= j #>(t.Item1, t.Item2);
                            }
                        }, StateTuple.Create(this, awaiter));
                    }
                }
<# } #>
            }

<# for(var j = 1; j <= i; j++) { #>
            static void TryInvokeContinuationT<#= j #>(WhenAnyPromise<<#= t #>> self, in UniTask<T<#= j #>>.Awaiter awaiter)
            {
                T<#= j #> result;
                try
                {
                    result = awaiter.GetResult();
                }
                catch (Exception ex)
                {
                    self.core.TrySetException(ex);
                    return;
                }

                if (Interlocked.Increment(ref self.completedCount) == 1)
                {
                    self.core.TrySetResult((<#= j - 1 #>, <#= getResult(j) #>));
                }
            }

<# } #>

            public (int, <#= tBool #>) GetResult(short token)
            {
                TaskTracker2.RemoveTracking(this);
                GC.SuppressFinalize(this);
                return core.GetResult(token);
            }

            public UniTaskStatus GetStatus(short token)
            {
                return core.GetStatus(token);
            }

            public void OnCompleted(Action<object> continuation, object state, short token)
            {
                core.OnCompleted(continuation, state, token);
            }

            public UniTaskStatus UnsafeGetStatus()
            {
                return core.UnsafeGetStatus();
            }

            void IUniTaskSource.GetResult(short token)
            {
                GetResult(token);
            }

            ~WhenAnyPromise()
            {
                core.Reset();
            }
        }

<# } #>
    }
}