46 lines
1.6 KiB
C++
46 lines
1.6 KiB
C++
// (C) Copyright David Abrahams 2002.
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// (C) Copyright Jeremy Siek 2002.
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// (C) Copyright Thomas Witt 2002.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// no include guard multiple inclusion intended
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//
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// This is a temporary workaround until the bulk of this is
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// available in boost config.
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// 23/02/03 thw
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//
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#include <boost/config.hpp> // for prior
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#include <boost/detail/workaround.hpp>
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#ifdef BOOST_ITERATOR_CONFIG_DEF
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# error you have nested config_def #inclusion.
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#else
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# define BOOST_ITERATOR_CONFIG_DEF
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#endif
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// We enable this always now. Otherwise, the simple case in
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// libs/iterator/test/constant_iterator_arrow.cpp fails to compile
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// because the operator-> return is improperly deduced as a non-const
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// pointer.
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// Recall that in general, compilers without partial specialization
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// can't strip constness. Consider counting_iterator, which normally
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// passes a const Value to iterator_facade. As a result, any code
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// which makes a std::vector of the iterator's value_type will fail
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// when its allocator declares functions overloaded on reference and
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// const_reference (the same type).
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//
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// Furthermore, Borland 5.5.1 drops constness in enough ways that we
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// end up using a proxy for operator[] when we otherwise shouldn't.
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// Using reference constness gives it an extra hint that it can
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// return the value_type from operator[] directly, but is not
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// strictly necessary. Not sure how best to resolve this one.
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# define BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY 1
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// no include guard; multiple inclusion intended
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