From b670b77060dee2bd2d2690efeb0c5777ee0a75be Mon Sep 17 00:00:00 2001
From: Wenzel Jakob <wenzel@inf.ethz.ch>
Date: Wed, 20 Jan 2016 01:26:43 +0100
Subject: [PATCH] minor adjustment to detail::is_copy_constructible (fixes #70)

---
 include/pybind11/common.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/pybind11/common.h b/include/pybind11/common.h
index a63b7f5b..2a00fa7d 100644
--- a/include/pybind11/common.h
+++ b/include/pybind11/common.h
@@ -247,7 +247,7 @@ template <typename T, size_t N> struct intrinsic_type<T[N]>       { typedef type
 /** \brief SFINAE helper class to check if a copy constructor is usable (in contrast to 
  * std::is_copy_constructible, this class also checks if the 'new' operator is accessible */
 template <typename T>  struct is_copy_constructible {
-    template <typename T2> static std::true_type test(decltype(new T2(std::declval<T2>())) *);
+    template <typename T2> static std::true_type test(decltype(new T2(std::declval<std::add_lvalue_reference<T2>::type>())) *);
     template <typename T2> static std::false_type test(...);
     static const bool value = std::is_same<std::true_type, decltype(test<T>(nullptr))>::value;
 };