From 010055816681a003a8090d105ea5ab385bb87bf8 Mon Sep 17 00:00:00 2001
From: Robert Ramey <ramey@rrsd.com>
Date: Fri, 24 Apr 2015 15:12:22 -0700
Subject: [PATCH] correction in shared_ptr_helper permit pass values by const &
 to output interface

---
 include/boost/archive/detail/interface_oarchive.hpp | 4 ++--
 include/boost/serialization/shared_ptr_helper.hpp   | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/boost/archive/detail/interface_oarchive.hpp b/include/boost/archive/detail/interface_oarchive.hpp
index 2cf55395..fc74ff1c 100644
--- a/include/boost/archive/detail/interface_oarchive.hpp
+++ b/include/boost/archive/detail/interface_oarchive.hpp
@@ -66,14 +66,14 @@ public:
     }
 
     template<class T>
-    Archive & operator<<(T & t){
+    Archive & operator<<(const T & t){
         this->This()->save_override(t);
         return * this->This();
     }
     
     // the & operator 
     template<class T>
-    Archive & operator&(T & t){
+    Archive & operator&(const T & t){
         #ifndef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
             return * this->This() << const_cast<const T &>(t);
         #else
diff --git a/include/boost/serialization/shared_ptr_helper.hpp b/include/boost/serialization/shared_ptr_helper.hpp
index 0eddd6b8..574a38ed 100644
--- a/include/boost/serialization/shared_ptr_helper.hpp
+++ b/include/boost/serialization/shared_ptr_helper.hpp
@@ -57,7 +57,7 @@ template<template<class T> class SPT>
 class shared_ptr_helper {
     typedef std::map<
         const void *, // address of object
-        SPT<void> // address shared ptr to single instance
+        SPT<const void> // address shared ptr to single instance
     > object_shared_pointer_map;
 
     // list of shared_pointers create accessable by raw pointer. This