author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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/*============================================================================= |
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Boost.Wave: A Standard compliant C++ preprocessor library |
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Definition of the preprocessor context |
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http://www.boost.org/ |
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Copyright (c) 2001-2007 Hartmut Kaiser. Distributed under the Boost |
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Software License, Version 1.0. (See accompanying file |
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LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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=============================================================================*/ |
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#if !defined(CPP_ITERATION_CONTEXT_HPP_00312288_9DDB_4668_AFE5_25D3994FD095_INCLUDED) |
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#define CPP_ITERATION_CONTEXT_HPP_00312288_9DDB_4668_AFE5_25D3994FD095_INCLUDED |
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#include <iterator> |
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#include <fstream> |
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#if defined(BOOST_NO_TEMPLATED_ITERATOR_CONSTRUCTORS) |
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#include <sstream> |
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#endif |
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#include <boost/wave/wave_config.hpp> |
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#include <boost/wave/cpp_exceptions.hpp> |
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#include <boost/wave/language_support.hpp> |
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#include <boost/wave/util/file_position.hpp> |
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// this must occur after all of the includes and before any code appears |
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#ifdef BOOST_HAS_ABI_HEADERS |
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#include BOOST_ABI_PREFIX |
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#endif |
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/////////////////////////////////////////////////////////////////////////////// |
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namespace boost { |
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namespace wave { |
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namespace iteration_context_policies { |
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/////////////////////////////////////////////////////////////////////////////// |
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// |
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// The iteration_context_policies templates are policies for the |
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// boost::wave::iteration_context which allows to control, how a given input file |
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// is to be represented by a pair of iterators pointing to the begin and |
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// the end of the resulting input sequence. |
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// |
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/////////////////////////////////////////////////////////////////////////////// |
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/////////////////////////////////////////////////////////////////////////// |
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// |
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// load_file_to_string |
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// |
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// Loads a file into a string and returns the iterators pointing to |
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// the beginning and the end of the loaded string. |
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// |
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/////////////////////////////////////////////////////////////////////////// |
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struct load_file_to_string |
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{ |
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template <typename IterContextT> |
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class inner |
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{ |
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public: |
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template <typename PositionT> |
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static |
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void init_iterators(IterContextT &iter_ctx, |
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PositionT const &act_pos) |
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{ |
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typedef typename IterContextT::iterator_type iterator_type; |
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std::ifstream instream(iter_ctx.filename.c_str()); |
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if (!instream.is_open()) { |
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BOOST_WAVE_THROW(preprocess_exception, bad_include_file, |
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iter_ctx.filename.c_str(), act_pos); |
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} |
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instream.unsetf(std::ios::skipws); |
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#if defined(BOOST_NO_TEMPLATED_ITERATOR_CONSTRUCTORS) |
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// this is known to be very slow for large files on some systems |
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std::copy (istream_iterator<char>(instream), |
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istream_iterator<char>(), |
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std::inserter(iter_ctx.instring, iter_ctx.instring.end())); |
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#else |
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iter_ctx.instring = std::string( |
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std::istreambuf_iterator<char>(instream.rdbuf()), |
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std::istreambuf_iterator<char>()); |
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#endif // defined(BOOST_NO_TEMPLATED_ITERATOR_CONSTRUCTORS) |
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iter_ctx.first = iterator_type(iter_ctx.instring.begin(), |
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iter_ctx.instring.end(), PositionT(iter_ctx.filename), |
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iter_ctx.language); |
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iter_ctx.last = iterator_type(); |
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} |
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private: |
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std::string instring; |
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}; |
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}; |
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/////////////////////////////////////////////////////////////////////////////// |
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// |
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// load_file |
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// |
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// The load_file policy opens a given file and returns the wrapped |
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// istreambuf_iterators. |
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// |
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/////////////////////////////////////////////////////////////////////////////// |
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struct load_file |
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{ |
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template <typename IterContextT> |
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class inner { |
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public: |
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~inner() { if (instream.is_open()) instream.close(); } |
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template <typename PositionT> |
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static |
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void init_iterators(IterContextT &iter_ctx, |
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PositionT const &act_pos) |
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{ |
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typedef typename IterContextT::iterator_type iterator_type; |
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iter_ctx.instream.open(iter_ctx.filename.c_str()); |
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if (!iter_ctx.instream.is_open()) { |
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BOOST_WAVE_THROW(preprocess_exception, bad_include_file, |
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iter_ctx.filename.c_str(), act_pos); |
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} |
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iter_ctx.instream.unsetf(std::ios::skipws); |
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using boost::spirit::make_multi_pass; |
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iter_ctx.first = iterator_type( |
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make_multi_pass(std::istreambuf_iterator<char>( |
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iter_ctx.instream.rdbuf())), |
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make_multi_pass(std::istreambuf_iterator<char>()), |
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PositionT(iter_ctx.filename), iter_ctx.language); |
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iter_ctx.last = iterator_type(); |
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} |
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133 |
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private: |
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std::ifstream instream; |
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}; |
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}; |
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|
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} // namespace iteration_context_policies |
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/////////////////////////////////////////////////////////////////////////////// |
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// |
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template <typename IteratorT> |
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struct base_iteration_context |
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{ |
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public: |
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base_iteration_context( |
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BOOST_WAVE_STRINGTYPE const &fname, std::size_t if_block_depth = 0) |
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: real_filename(fname), filename(fname), line(1), emitted_lines(1), |
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if_block_depth(if_block_depth) |
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{} |
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base_iteration_context(IteratorT const &first_, IteratorT const &last_, |
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BOOST_WAVE_STRINGTYPE const &fname, std::size_t if_block_depth = 0) |
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: first(first_), last(last_), real_filename(fname), filename(fname), |
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line(1), emitted_lines(1), if_block_depth(if_block_depth) |
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{} |
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|
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// the actual input stream |
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IteratorT first; // actual input stream position |
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IteratorT last; // end of input stream |
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BOOST_WAVE_STRINGTYPE real_filename; // real name of the current file |
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BOOST_WAVE_STRINGTYPE filename; // actual processed file |
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unsigned int line; // line counter of underlying stream |
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unsigned int emitted_lines; // count of emitted newlines |
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std::size_t if_block_depth; // depth of #if block recursion |
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}; |
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|
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/////////////////////////////////////////////////////////////////////////////// |
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// |
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template < |
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typename IteratorT, |
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typename InputPolicyT = iteration_context_policies::load_file_to_string |
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> |
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struct iteration_context |
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: public base_iteration_context<IteratorT>, |
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public InputPolicyT::template |
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inner<iteration_context<IteratorT, InputPolicyT> > |
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{ |
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typedef IteratorT iterator_type; |
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typedef typename IteratorT::token_type::position_type position_type; |
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|
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typedef iteration_context<IteratorT, InputPolicyT> self_type; |
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|
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iteration_context(BOOST_WAVE_STRINGTYPE const &fname, |
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position_type const &act_pos, |
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boost::wave::language_support language_) |
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: base_iteration_context<IteratorT>(fname), |
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language(language_) |
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{ |
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InputPolicyT::template inner<self_type>::init_iterators(*this, act_pos); |
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} |
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|
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boost::wave::language_support language; |
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}; |
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|
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/////////////////////////////////////////////////////////////////////////////// |
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} // namespace wave |
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} // namespace boost |
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|
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// the suffix header occurs after all of the code |
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#ifdef BOOST_HAS_ABI_HEADERS |
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#include BOOST_ABI_SUFFIX |
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#endif |
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|
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#endif // !defined(CPP_ITERATION_CONTEXT_HPP_00312288_9DDB_4668_AFE5_25D3994FD095_INCLUDED) |