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diff --git a/contrib/epee/include/to_nonconst_iterator.h b/contrib/epee/include/to_nonconst_iterator.h
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+++ b/contrib/epee/include/to_nonconst_iterator.h
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+// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in the
+// documentation and/or other materials provided with the distribution.
+// * Neither the name of the Andrey N. Sabelnikov nor the
+// names of its contributors may be used to endorse or promote products
+// derived from this software without specific prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER  BE LIABLE FOR ANY
+// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// 
+
+
+
+#ifndef _TO_NONCONST_ITERATOR_H_
+#define _TO_NONCONST_ITERATOR_H_
+
+namespace epee
+{
+
+template<class Type>
+typename Type::iterator to_nonsonst_iterator(Type& obj, typename Type::const_iterator it)
+{
+	typename Type::difference_type dist =  std::distance(static_cast<typename Type::const_iterator>(obj.begin()), it);
+	typename Type::iterator res_it = obj.begin()+dist;
+	return res_it;
+}
+
+
+template<class Type>
+typename Type::iterator to_nonsonst_iterator(typename Type::iterator base_it, typename Type::const_iterator it)
+{
+	typename Type::difference_type dist =  std::distance(static_cast<typename Type::const_iterator>(base_it), it);
+	typename Type::iterator res_it = base_it+dist;
+	return res_it;
+}
+}//namespace epee
+#endif //_TO_NONCONST_ITERATOR_H_