From e6fd299292f724243676324aa6cfbe3fba7ff5b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ion=20Gazta=C3=B1aga?= <igaztanaga@gmail.com>
Date: Tue, 10 Apr 2012 20:16:14 +0000
Subject: [PATCH] Added SFINAE to constructors

[SVN r77896]
---
 include/boost/container/detail/pair.hpp | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/include/boost/container/detail/pair.hpp b/include/boost/container/detail/pair.hpp
index 3c3ae38..af32d6a 100644
--- a/include/boost/container/detail/pair.hpp
+++ b/include/boost/container/detail/pair.hpp
@@ -20,6 +20,8 @@
 #include "config_begin.hpp"
 #include <boost/container/detail/workaround.hpp>
 
+#include <boost/container/detail/mpl.hpp>
+#include <boost/container/detail/type_traits.hpp>
 #include <boost/container/detail/mpl.hpp>
 #include <boost/container/detail/type_traits.hpp>
 
@@ -211,7 +213,11 @@ struct pair
    }
 
    template <class D, class S>
-   pair& operator=(const pair<D, S>&p)
+   typename ::boost::container::container_detail::enable_if_c
+      < !(::boost::container::container_detail::is_same<T1, D>::value &&
+          ::boost::container::container_detail::is_same<T2, S>::value)
+      , pair &>::type
+      operator=(const pair<D, S>&p)
    {
       first  = p.first;
       second = p.second;
@@ -219,7 +225,11 @@ struct pair
    }
 
    template <class D, class S>
-   pair& operator=(BOOST_RV_REF_BEG pair<D, S> BOOST_RV_REF_END p)
+   typename ::boost::container::container_detail::enable_if_c
+      < !(::boost::container::container_detail::is_same<T1, D>::value &&
+          ::boost::container::container_detail::is_same<T2, S>::value)
+      , pair &>::type
+      operator=(BOOST_RV_REF_BEG pair<D, S> BOOST_RV_REF_END p)
    {
       first  = ::boost::move(p.first);
       second = ::boost::move(p.second);