From 02b95b4ac3d8bf954047e10beab85973e03853b8 Mon Sep 17 00:00:00 2001
From: jizhuozhi <jizhuozhi.george@gmail.com>
Date: Sun, 11 Aug 2024 18:41:43 +0800
Subject: [PATCH] fix: return directly if no futures

---
 api.go      |  4 ++++
 api_test.go | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/api.go b/api.go
index a85bd85..07443c6 100644
--- a/api.go
+++ b/api.go
@@ -70,6 +70,10 @@ type AnyResult[T any] struct {
 }
 
 func AnyOf[T any](fs ...*Future[T]) *Future[AnyResult[T]] {
+	if len(fs) == 0 {
+		return Done(AnyResult[T]{Index: -1})
+	}
+
 	var counter int32
 	var done uint32
 	var errIndex int32 = -1
diff --git a/api_test.go b/api_test.go
index c74fc48..578c44a 100644
--- a/api_test.go
+++ b/api_test.go
@@ -249,6 +249,16 @@ func TestAnyOf(t *testing.T) {
 	assert.Equal(t, nil, r.Err)
 }
 
+func TestAnyOfEmpty(t *testing.T) {
+	fs := make([]*Future[int], 0)
+	f := AnyOf(fs...)
+	r, err := f.Get()
+	assert.NoError(t, err)
+	assert.Equal(t, -1, r.Index)
+	assert.Zero(t, r.Val)
+	assert.NoError(t, r.Err)
+}
+
 func TestAnyOfWhenAllErr(t *testing.T) {
 	target := rand.Intn(10)
 	vals := make([]int, 10)