From 800c10a4eb5053f4c7e9aa0084d9272de1fe5cd3 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@pdimov.com>
Date: Wed, 11 Jun 2014 14:45:37 +0300
Subject: [PATCH] Remove use of mpl::identity from implicit_cast.hpp.

---
 include/boost/implicit_cast.hpp | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/include/boost/implicit_cast.hpp b/include/boost/implicit_cast.hpp
index 5b1cd92..d82db76 100644
--- a/include/boost/implicit_cast.hpp
+++ b/include/boost/implicit_cast.hpp
@@ -5,17 +5,24 @@
 #ifndef IMPLICIT_CAST_DWA200356_HPP
 # define IMPLICIT_CAST_DWA200356_HPP
 
-# include <boost/mpl/identity.hpp>
-
 namespace boost {
 
+namespace detail {
+
+template<class T> struct icast_identity
+{
+    typedef T type;
+};
+
+} // namespace detail
+
 // implementation originally suggested by C. Green in
 // http://lists.boost.org/MailArchives/boost/msg00886.php
 
 // The use of identity creates a non-deduced form, so that the
 // explicit template argument must be supplied
 template <typename T>
-inline T implicit_cast (typename mpl::identity<T>::type x) {
+inline T implicit_cast (typename boost::detail::icast_identity<T>::type x) {
     return x;
 }