From 59c256537adf5b5262f47066bdefd220cf9d772a Mon Sep 17 00:00:00 2001
From: Zihan Chen <vczh@163.com>
Date: Fri, 6 Jul 2018 01:38:22 -0700
Subject: [PATCH] ...

---
 Import/VlppWorkflowLibrary.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Import/VlppWorkflowLibrary.h b/Import/VlppWorkflowLibrary.h
index b613040a..d98ccf19 100644
--- a/Import/VlppWorkflowLibrary.h
+++ b/Import/VlppWorkflowLibrary.h
@@ -226,9 +226,9 @@ namespace vl
 		}
 
 		template<typename T, typename U>
-		Ptr<T> UnboxCollection(U& value)
+		Ptr<T> UnboxCollection(const U& value)
 		{
-			auto boxedValue = reflection::description::BoxParameter<U>(value);
+			auto boxedValue = reflection::description::BoxParameter<U>(const_cast<U&>(value));
 			Ptr<T> result;
 			reflection::description::UnboxParameter<Ptr<T>>(boxedValue, result);
 			return result;