From 98697959dd6694ba370528b1a671c6058454ca96 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joachim=20Sch=C3=B6berl?= <joachim.schoeberl@tuwien.ac.at>
Date: Wed, 9 Sep 2020 06:31:03 +0200
Subject: [PATCH] check for copy_assignable

---
 libsrc/core/array.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libsrc/core/array.hpp b/libsrc/core/array.hpp
index c83c4431..f91c4f7e 100644
--- a/libsrc/core/array.hpp
+++ b/libsrc/core/array.hpp
@@ -940,7 +940,7 @@ namespace ngcore
     /// array copy
     NETGEN_INLINE Array & operator= (const Array & a2)
     {
-      if constexpr (std::is_assignable<T,T>::value)
+      if constexpr (std::is_copy_assignable<T>::value)
         {
           SetSize0 ();
           SetSize (a2.Size());
@@ -952,6 +952,7 @@ namespace ngcore
         throw Exception(std::string("cannot copy Array of type ") + typeid(T).name());
     }
 
+    
     /// steal array 
     NETGEN_INLINE Array & operator= (Array && a2)
     {