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+#ifndef BOOST_ARCHIVE_ITERATORS_BASE16_FROM_BINARY_HPP
+#define BOOST_ARCHIVE_ITERATORS_BASE16_FROM_BINARY_HPP
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// base16_from_binary.h (derived from boost base64_from_binary.hpp)
+
+// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
+// Use, modification and distribution is subject to the Boost Software
+// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// See http://www.boost.org for updates, documentation, and revision history.
+
+#include <exceptions/isc_assert.h>
+
+#include <cstddef> // size_t
+#include <boost/config.hpp> // for BOOST_DEDUCED_TYPENAME
+#if defined(BOOST_NO_STDC_NAMESPACE)
+namespace std{
+ using ::size_t;
+} // namespace std
+#endif
+
+// See base32hex_from_binary.h for why we need base64_from...hpp here.
+#include <boost/archive/iterators/base64_from_binary.hpp>
+
+namespace boost {
+namespace archive {
+namespace iterators {
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// convert binary integers to base16 characters
+
+namespace detail {
+
+template<class CharType>
+struct from_4_bit {
+ typedef CharType result_type;
+ CharType operator()(CharType t) const{
+ const char * lookup_table =
+ "0123456789"
+ "ABCDEF";
+ isc_throw_assert(t < 16);
+ return (lookup_table[static_cast<size_t>(t)]);
+ }
+};
+
+} // namespace detail
+
+// note: what we would like to do is
+// template<class Base, class CharType = BOOST_DEDUCED_TYPENAME Base::value_type>
+// typedef transform_iterator<
+// from_4_bit<CharType>,
+// transform_width<Base, 4, sizeof(Base::value_type) * 8, CharType>
+// > base16_from_binary;
+// but C++ won't accept this. Rather than using a "type generator" and
+// using a different syntax, make a derivation which should be equivalent.
+//
+// Another issue addressed here is that the transform_iterator doesn't have
+// a templated constructor. This makes it incompatible with the dataflow
+// ideal. This is also addressed here.
+
+//template<class Base, class CharType = BOOST_DEDUCED_TYPENAME Base::value_type>
+template<
+ class Base,
+ class CharType = BOOST_DEDUCED_TYPENAME boost::iterator_value<Base>::type
+>
+class base16_from_binary :
+ public transform_iterator<
+ detail::from_4_bit<CharType>,
+ Base
+ >
+{
+ friend class boost::iterator_core_access;
+ typedef transform_iterator<
+ BOOST_DEDUCED_TYPENAME detail::from_4_bit<CharType>,
+ Base
+ > super_t;
+
+public:
+ // make composable by using templated constructor
+ template<class T>
+ base16_from_binary(T start) :
+ super_t(
+ Base(static_cast<T>(start)),
+ detail::from_4_bit<CharType>()
+ )
+ {}
+ // intel 7.1 doesn't like default copy constructor
+ base16_from_binary(const base16_from_binary & rhs) :
+ super_t(
+ Base(rhs.base_reference()),
+ detail::from_4_bit<CharType>()
+ )
+ {}
+// base16_from_binary(){};
+};
+
+} // namespace iterators
+} // namespace archive
+} // namespace boost
+
+#endif // BOOST_ARCHIVE_ITERATORS_BASE16_FROM_BINARY_HPP