From 40249dfacbe00115efc649bf78b21451cfa97869 Mon Sep 17 00:00:00 2001
From: Darien Raymond <admin@v2ray.com>
Date: Thu, 8 Dec 2016 22:49:24 +0100
Subject: [PATCH] change API

---
 transport/internet/kcp/sending.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/transport/internet/kcp/sending.go b/transport/internet/kcp/sending.go
index 1159f6c57..b058ae099 100644
--- a/transport/internet/kcp/sending.go
+++ b/transport/internet/kcp/sending.go
@@ -88,7 +88,7 @@ func (v *SendingWindow) Clear(una uint32) {
 }
 
 func (v *SendingWindow) Remove(idx uint32) bool {
-	if v.len == 0 {
+	if v.IsEmpty() {
 		return false
 	}