1 /*=============================================================================
2     Boost.Wave: A Standard compliant C++ preprocessor library
3     Definition of the preprocessor context
4 
5     http://www.boost.org/
6 
7     Copyright (c) 2001-2012 Hartmut Kaiser. Distributed under the Boost
8     Software License, Version 1.0. (See accompanying file
9     LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
10 =============================================================================*/
11 
12 #if !defined(BOOST_CPP_CONTEXT_HPP_907485E2_6649_4A87_911B_7F7225F3E5B8_INCLUDED)
13 #define BOOST_CPP_CONTEXT_HPP_907485E2_6649_4A87_911B_7F7225F3E5B8_INCLUDED
14 
15 #include <string>
16 #include <vector>
17 #include <stack>
18 
19 #include <boost/concept_check.hpp>
20 #include <boost/noncopyable.hpp>
21 #include <boost/filesystem/path.hpp>
22 #include <boost/mpl/if.hpp>
23 #include <boost/type_traits/is_same.hpp>
24 #include <boost/pool/pool_alloc.hpp>
25 
26 #include <boost/wave/wave_config.hpp>
27 #if BOOST_WAVE_SERIALIZATION != 0
28 #include <boost/serialization/serialization.hpp>
29 #include <boost/wave/wave_config_constant.hpp>
30 #endif
31 #include <boost/wave/token_ids.hpp>
32 
33 #include <boost/wave/util/unput_queue_iterator.hpp>
34 #include <boost/wave/util/cpp_ifblock.hpp>
35 #include <boost/wave/util/cpp_include_paths.hpp>
36 #include <boost/wave/util/iteration_context.hpp>
37 #include <boost/wave/util/cpp_iterator.hpp>
38 #include <boost/wave/util/cpp_macromap.hpp>
39 
40 #include <boost/wave/preprocessing_hooks.hpp>
41 #include <boost/wave/whitespace_handling.hpp>
42 #include <boost/wave/cpp_iteration_context.hpp>
43 #include <boost/wave/language_support.hpp>
44 
45 // this must occur after all of the includes and before any code appears
46 #ifdef BOOST_HAS_ABI_HEADERS
47 #include BOOST_ABI_PREFIX
48 #endif
49 
50 ///////////////////////////////////////////////////////////////////////////////
51 namespace boost {
52 namespace wave {
53 
54 ///////////////////////////////////////////////////////////////////////////////
55 //
56 //  The C/C++ preprocessor context template class
57 //
58 //      The boost::wave::context template is the main interface class to
59 //      control the behavior of the preprocessing engine.
60 //
61 //      The following template parameters has to be supplied:
62 //
63 //      IteratorT       The iterator type of the underlying input stream
64 //      LexIteratorT    The lexer iterator type to use as the token factory
65 //      InputPolicyT    The input policy type to use for loading the files
66 //                      to be included. This template parameter is optional and
67 //                      defaults to the
68 //                          iteration_context_policies::load_file_to_string
69 //                      type.
70 //      HooksT          The hooks policy to use for different notification
71 //                      callbacks. This template parameter is optional and
72 //                      defaults to the
73 //                          context_policies::default_preprocessing_hooks
74 //                      type.
75 //      DerivedT        The type of the type being derived from the context
76 //                      type (if any). This template parameter is optional and
77 //                      defaults to 'this_type', which means that the context
78 //                      type will be used assuming no derived type exists.
79 //
80 ///////////////////////////////////////////////////////////////////////////////
81 
82 struct this_type {};
83 
84 template <
85     typename IteratorT,
86     typename LexIteratorT,
87     typename InputPolicyT = iteration_context_policies::load_file_to_string,
88     typename HooksT = context_policies::eat_whitespace<typename LexIteratorT::token_type>,
89     typename DerivedT = this_type
90 >
91 class context : private boost::noncopyable
92 {
93 private:
94     typedef typename mpl::if_<
95             is_same<DerivedT, this_type>, context, DerivedT
96         >::type actual_context_type;
97 
98 public:
99     // concept checks
100     // the given iterator should be at least a forward iterator type
101     BOOST_CLASS_REQUIRE(IteratorT, boost, ForwardIteratorConcept);
102 
103     // public typedefs
104     typedef typename LexIteratorT::token_type       token_type;
105     typedef typename token_type::string_type        string_type;
106 
107     typedef IteratorT                               target_iterator_type;
108     typedef LexIteratorT                            lexer_type;
109     typedef pp_iterator<context>                    iterator_type;
110 
111     typedef InputPolicyT                            input_policy_type;
112     typedef typename token_type::position_type      position_type;
113 
114     // type of a token sequence
115     typedef std::list<token_type, boost::fast_pool_allocator<token_type> >
116         token_sequence_type;
117     // type of the policies
118     typedef HooksT                                  hook_policy_type;
119 
120 private:
121     // stack of shared_ptr's to the pending iteration contexts
122     typedef boost::shared_ptr<base_iteration_context<context, lexer_type> >
123         iteration_ptr_type;
124     typedef boost::wave::util::iteration_context_stack<iteration_ptr_type>
125             iteration_context_stack_type;
126     typedef typename iteration_context_stack_type::size_type iter_size_type;
127 
this_()128     context *this_() { return this; }           // avoid warning in constructor
129 
130 public:
context(target_iterator_type const & first_,target_iterator_type const & last_,char const * fname="<Unknown>",HooksT const & hooks_=HooksT ())131     context(target_iterator_type const &first_, target_iterator_type const &last_,
132             char const *fname = "<Unknown>", HooksT const &hooks_ = HooksT())
133     :   first(first_), last(last_), filename(fname)
134       , has_been_initialized(false)
135 #if BOOST_WAVE_SUPPORT_PRAGMA_ONCE != 0
136       , current_filename(fname)
137 #endif
138       , current_relative_filename(fname)
139       , macros(*this_())
140       , language(language_support(
141                       support_cpp
142                     | support_option_convert_trigraphs
143                     | support_option_emit_line_directives
144 #if BOOST_WAVE_SUPPORT_PRAGMA_ONCE != 0
145                     | support_option_include_guard_detection
146 #endif
147 #if BOOST_WAVE_EMIT_PRAGMA_DIRECTIVES != 0
148                     | support_option_emit_pragma_directives
149 #endif
150                     | support_option_insert_whitespace
151                    ))
152       , hooks(hooks_)
153     {
154         macros.init_predefined_macros(fname);
155     }
156 
157     // default copy constructor
158     // default assignment operator
159     // default destructor
160 
161     // iterator interface
begin()162     iterator_type begin()
163     {
164         std::string fname(filename);
165         if (filename != "<Unknown>" && filename != "<stdin>") {
166             using namespace boost::filesystem;
167             path fpath(util::complete_path(path(filename)));
168             fname = fpath.string();
169         }
170         return iterator_type(*this, first, last, position_type(fname.c_str()));
171     }
begin(target_iterator_type const & first_,target_iterator_type const & last_)172     iterator_type begin(
173         target_iterator_type const &first_,
174         target_iterator_type const &last_)
175     {
176         std::string fname(filename);
177         if (filename != "<Unknown>" && filename != "<stdin>") {
178             using namespace boost::filesystem;
179             path fpath(util::complete_path(path(filename)));
180             fname = fpath.string();
181         }
182         return iterator_type(*this, first_, last_, position_type(fname.c_str()));
183     }
end() const184     iterator_type end() const
185         { return iterator_type(); }
186 
187     // maintain include paths
add_include_path(char const * path_)188     bool add_include_path(char const *path_)
189         { return includes.add_include_path(path_, false);}
add_sysinclude_path(char const * path_)190     bool add_sysinclude_path(char const *path_)
191         { return includes.add_include_path(path_, true);}
set_sysinclude_delimiter()192     void set_sysinclude_delimiter() { includes.set_sys_include_delimiter(); }
get_iteration_depth() const193     typename iteration_context_stack_type::size_type get_iteration_depth() const
194         { return iter_ctxs.size(); }
195 
196 // maintain defined macros
197 #if BOOST_WAVE_ENABLE_COMMANDLINE_MACROS != 0
198     template <typename StringT>
add_macro_definition(StringT macrostring,bool is_predefined=false)199     bool add_macro_definition(StringT macrostring, bool is_predefined = false)
200     {
201         return boost::wave::util::add_macro_definition(*this,
202             util::to_string<std::string>(macrostring), is_predefined,
203             get_language());
204     }
205 #endif
206     // Define and undefine macros, macro introspection
207     template <typename StringT>
add_macro_definition(StringT const & name,position_type const & pos,bool has_params,std::vector<token_type> & parameters,token_sequence_type & definition,bool is_predefined=false)208     bool add_macro_definition(StringT const &name, position_type const& pos,
209         bool has_params, std::vector<token_type> &parameters,
210         token_sequence_type &definition, bool is_predefined = false)
211     {
212         return macros.add_macro(
213             token_type(T_IDENTIFIER, util::to_string<string_type>(name), pos),
214             has_params, parameters, definition, is_predefined);
215     }
216     template <typename StringT>
is_defined_macro(StringT const & str) const217     bool is_defined_macro(StringT const &str) const
218     {
219         return macros.is_defined(util::to_string<string_type>(str));
220     }
221     template <typename StringT>
get_macro_definition(StringT const & name,bool & has_params,bool & is_predefined,position_type & pos,std::vector<token_type> & parameters,token_sequence_type & definition) const222     bool get_macro_definition(StringT const &name,
223         bool &has_params, bool &is_predefined, position_type &pos,
224         std::vector<token_type> &parameters,
225         token_sequence_type &definition) const
226     {
227         return macros.get_macro(util::to_string<string_type>(name),
228             has_params, is_predefined, pos, parameters, definition);
229     }
230     template <typename StringT>
remove_macro_definition(StringT const & undefname,bool even_predefined=false)231     bool remove_macro_definition(StringT const& undefname, bool even_predefined = false)
232     {
233         // strip leading and trailing whitespace
234         string_type name = util::to_string<string_type>(undefname);
235         typename string_type::size_type pos = name.find_first_not_of(" \t");
236         if (pos != string_type::npos) {
237             typename string_type::size_type endpos = name.find_last_not_of(" \t");
238             name = name.substr(pos, endpos-pos+1);
239         }
240 
241 #if BOOST_WAVE_SUPPORT_PRAGMA_ONCE != 0
242         // ensure this gets removed from the list of include guards as well
243         includes.remove_pragma_once_header(
244             util::to_string<std::string>(name));
245 #endif
246         return macros.remove_macro(name, macros.get_main_pos(), even_predefined);
247     }
reset_macro_definitions()248     void reset_macro_definitions()
249         { macros.reset_macromap(); macros.init_predefined_macros(); }
250 
251     // Iterate over names of defined macros
252     typedef boost::wave::util::macromap<context> macromap_type;
253     typedef typename macromap_type::name_iterator name_iterator;
254     typedef typename macromap_type::const_name_iterator const_name_iterator;
255 
macro_names_begin()256     name_iterator macro_names_begin() { return macros.begin(); }
macro_names_end()257     name_iterator macro_names_end() { return macros.end(); }
macro_names_begin() const258     const_name_iterator macro_names_begin() const { return macros.begin(); }
macro_names_end() const259     const_name_iterator macro_names_end() const { return macros.end(); }
260 
261     // This version now is used internally mainly, but since it was a documented
262     // API function we leave it in the public interface.
add_macro_definition(token_type const & name,bool has_params,std::vector<token_type> & parameters,token_sequence_type & definition,bool is_predefined=false)263     bool add_macro_definition(token_type const &name, bool has_params,
264         std::vector<token_type> &parameters, token_sequence_type &definition,
265         bool is_predefined = false)
266     {
267         return macros.add_macro(name, has_params, parameters, definition,
268             is_predefined);
269     }
270 
271     // get the Wave version information
get_version()272     static std::string get_version()
273     {
274         boost::wave::util::predefined_macros p;
275         return util::to_string<std::string>(p.get_fullversion());
276     }
get_version_string()277     static std::string get_version_string()
278     {
279         boost::wave::util::predefined_macros p;
280         return util::to_string<std::string>(p.get_versionstr());
281     }
282 
283     // access current language options
set_language(boost::wave::language_support language_,bool reset_macros=true)284     void set_language(boost::wave::language_support language_,
285                       bool reset_macros = true)
286     {
287         language = language_;
288         if (reset_macros)
289             reset_macro_definitions();
290     }
get_language() const291     boost::wave::language_support get_language() const { return language; }
292 
get_main_pos()293     position_type &get_main_pos() { return macros.get_main_pos(); }
get_main_pos() const294     position_type const& get_main_pos() const { return macros.get_main_pos(); }
295 
296     // change and ask for maximal possible include nesting depth
set_max_include_nesting_depth(iter_size_type new_depth)297     void set_max_include_nesting_depth(iter_size_type new_depth)
298         { iter_ctxs.set_max_include_nesting_depth(new_depth); }
get_max_include_nesting_depth() const299     iter_size_type get_max_include_nesting_depth() const
300         { return iter_ctxs.get_max_include_nesting_depth(); }
301 
302     // access the policies
get_hooks()303     hook_policy_type &get_hooks() { return hooks; }
get_hooks() const304     hook_policy_type const &get_hooks() const { return hooks; }
305 
306     // return type of actually used context type (might be the derived type)
derived()307     actual_context_type& derived()
308         { return *static_cast<actual_context_type*>(this); }
derived() const309     actual_context_type const& derived() const
310         { return *static_cast<actual_context_type const*>(this); }
311 
312 // return the directory of the currently preprocessed file
get_current_directory() const313     boost::filesystem::path get_current_directory() const
314         { return includes.get_current_directory(); }
315 
316 #if !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
317 protected:
318     friend class boost::wave::pp_iterator<context>;
319     friend class boost::wave::impl::pp_iterator_functor<context>;
320     friend class boost::wave::util::macromap<context>;
321 #endif
322 
323     // make sure the context has been initialized
init_context()324     void init_context()
325     {
326         if (!has_been_initialized) {
327             std::string fname(filename);
328             if (filename != "<Unknown>" && filename != "<stdin>") {
329                 using namespace boost::filesystem;
330                 path fpath(util::complete_path(path(filename)));
331                 fname = fpath.string();
332                 includes.set_current_directory(fname.c_str());
333             }
334             has_been_initialized = true;  // execute once
335         }
336     }
337 
338     template <typename IteratorT2>
is_defined_macro(IteratorT2 const & begin,IteratorT2 const & end) const339     bool is_defined_macro(IteratorT2 const &begin, IteratorT2 const &end) const
340         { return macros.is_defined(begin, end); }
341 
342     // maintain include paths (helper functions)
set_current_directory(char const * path_)343     void set_current_directory(char const *path_)
344         { includes.set_current_directory(path_); }
345 
346     // conditional compilation contexts
get_if_block_status() const347     bool get_if_block_status() const { return ifblocks.get_status(); }
get_if_block_some_part_status() const348     bool get_if_block_some_part_status() const
349         { return ifblocks.get_some_part_status(); }
get_enclosing_if_block_status() const350     bool get_enclosing_if_block_status() const
351         { return ifblocks.get_enclosing_status(); }
enter_if_block(bool new_status)352     void enter_if_block(bool new_status)
353         { ifblocks.enter_if_block(new_status); }
enter_elif_block(bool new_status)354     bool enter_elif_block(bool new_status)
355         { return ifblocks.enter_elif_block(new_status); }
enter_else_block()356     bool enter_else_block() { return ifblocks.enter_else_block(); }
exit_if_block()357     bool exit_if_block() { return ifblocks.exit_if_block(); }
get_if_block_depth() const358     typename boost::wave::util::if_block_stack::size_type get_if_block_depth() const
359         { return ifblocks.get_if_block_depth(); }
360 
361     // stack of iteration contexts
pop_iteration_context()362     iteration_ptr_type pop_iteration_context()
363         { iteration_ptr_type top = iter_ctxs.top(); iter_ctxs.pop(); return top; }
push_iteration_context(position_type const & act_pos,iteration_ptr_type iter_ctx)364     void push_iteration_context(position_type const &act_pos, iteration_ptr_type iter_ctx)
365         { iter_ctxs.push(*this, act_pos, iter_ctx); }
366 
367     ///////////////////////////////////////////////////////////////////////////////
368     //
369     //  expand_tokensequence():
370     //      expands all macros contained in a given token sequence, handles '##'
371     //      and '#' pp operators and re-scans the resulting sequence
372     //      (essentially pre-processes the token sequence).
373     //
374     //      The expand_defined parameter is true during macro expansion inside
375     //      a C++ expression given for a #if or #elif statement.
376     //
377     ///////////////////////////////////////////////////////////////////////////////
378     template <typename IteratorT2>
expand_tokensequence(IteratorT2 & first_,IteratorT2 const & last_,token_sequence_type & pending,token_sequence_type & expanded,bool & seen_newline,bool expand_defined=false,bool expand_has_include=false)379     token_type expand_tokensequence(IteratorT2 &first_, IteratorT2 const &last_,
380         token_sequence_type &pending, token_sequence_type &expanded,
381         bool& seen_newline, bool expand_defined = false,
382         bool expand_has_include = false)
383     {
384         return macros.expand_tokensequence(first_, last_, pending, expanded,
385             seen_newline, expand_defined, expand_has_include);
386     }
387 
388     template <typename IteratorT2>
expand_whole_tokensequence(IteratorT2 & first_,IteratorT2 const & last_,token_sequence_type & expanded,bool expand_defined=true,bool expand_has_include=true)389     void expand_whole_tokensequence(IteratorT2 &first_, IteratorT2 const &last_,
390         token_sequence_type &expanded, bool expand_defined = true,
391         bool expand_has_include = true)
392     {
393         macros.expand_whole_tokensequence(
394             expanded, first_, last_,
395             expand_defined, expand_has_include);
396 
397         // remove any contained placeholder
398         boost::wave::util::impl::remove_placeholders(expanded);
399     }
400 
401 public:
402 #if BOOST_WAVE_SUPPORT_PRAGMA_ONCE != 0
403     // support for #pragma once
404     // maintain the real name of the current preprocessed file
set_current_filename(char const * real_name)405     void set_current_filename(char const *real_name)
406         { current_filename = real_name; }
get_current_filename() const407     std::string const &get_current_filename() const
408         { return current_filename; }
409 
410     // maintain the list of known headers containing #pragma once
has_pragma_once(std::string const & filename_)411     bool has_pragma_once(std::string const &filename_)
412         { return includes.has_pragma_once(filename_); }
add_pragma_once_header(std::string const & filename_,std::string const & guard_name)413     bool add_pragma_once_header(std::string const &filename_,
414             std::string const& guard_name)
415     {
416         get_hooks().detected_include_guard(derived(), filename_, guard_name);
417         return includes.add_pragma_once_header(filename_, guard_name);
418     }
add_pragma_once_header(token_type const & pragma_,std::string const & filename_)419     bool add_pragma_once_header(token_type const &pragma_,
420         std::string const &filename_)
421     {
422         get_hooks().detected_pragma_once(derived(), pragma_, filename_);
423         return includes.add_pragma_once_header(filename_,
424             "__BOOST_WAVE_PRAGMA_ONCE__");
425     }
426 #endif
427 
set_current_relative_filename(char const * real_name)428     void set_current_relative_filename(char const *real_name)
429         { current_relative_filename = real_name; }
get_current_relative_filename() const430     std::string const &get_current_relative_filename() const
431         { return current_relative_filename; }
432 
find_include_file(std::string & s,std::string & d,bool is_system,char const * current_file) const433     bool find_include_file (std::string &s, std::string &d, bool is_system,
434         char const *current_file) const
435     { return includes.find_include_file(s, d, is_system, current_file); }
436 
437 #if BOOST_WAVE_SERIALIZATION != 0
438 public:
439     BOOST_STATIC_CONSTANT(unsigned int, version = 0x10);
440     BOOST_STATIC_CONSTANT(unsigned int, version_mask = 0x0f);
441 
442 private:
443     friend class boost::serialization::access;
444     template<class Archive>
save(Archive & ar,const unsigned int version) const445     void save(Archive & ar, const unsigned int version) const
446     {
447         using namespace boost::serialization;
448 
449         string_type cfg(BOOST_PP_STRINGIZE(BOOST_WAVE_CONFIG));
450         string_type kwd(BOOST_WAVE_PRAGMA_KEYWORD);
451         string_type strtype(BOOST_PP_STRINGIZE((BOOST_WAVE_STRINGTYPE)));
452         ar & make_nvp("config", cfg);
453         ar & make_nvp("pragma_keyword", kwd);
454         ar & make_nvp("string_type", strtype);
455 
456         ar & make_nvp("language_options", language);
457         ar & make_nvp("macro_definitions", macros);
458         ar & make_nvp("include_settings", includes);
459     }
460     template<class Archive>
load(Archive & ar,const unsigned int loaded_version)461     void load(Archive & ar, const unsigned int loaded_version)
462     {
463         using namespace boost::serialization;
464         if (version != (loaded_version & ~version_mask)) {
465             BOOST_WAVE_THROW_CTX((*this), preprocess_exception,
466                 incompatible_config, "cpp_context state version",
467                 get_main_pos());
468             return;
469         }
470 
471         // check compatibility of the stored information
472         string_type config, pragma_keyword, string_type_str;
473 
474         // BOOST_PP_STRINGIZE(BOOST_WAVE_CONFIG)
475         ar & make_nvp("config", config);
476         if (config != BOOST_PP_STRINGIZE(BOOST_WAVE_CONFIG)) {
477             BOOST_WAVE_THROW_CTX((*this), preprocess_exception,
478                 incompatible_config, "BOOST_WAVE_CONFIG", get_main_pos());
479             return;
480         }
481 
482         // BOOST_WAVE_PRAGMA_KEYWORD
483         ar & make_nvp("pragma_keyword", pragma_keyword);
484         if (pragma_keyword != BOOST_WAVE_PRAGMA_KEYWORD) {
485             BOOST_WAVE_THROW_CTX((*this), preprocess_exception,
486                 incompatible_config, "BOOST_WAVE_PRAGMA_KEYWORD",
487                 get_main_pos());
488             return;
489         }
490 
491         // BOOST_PP_STRINGIZE((BOOST_WAVE_STRINGTYPE))
492         ar & make_nvp("string_type", string_type_str);
493         if (string_type_str != BOOST_PP_STRINGIZE((BOOST_WAVE_STRINGTYPE))) {
494             BOOST_WAVE_THROW_CTX((*this), preprocess_exception,
495                 incompatible_config, "BOOST_WAVE_STRINGTYPE", get_main_pos());
496             return;
497         }
498 
499         try {
500             // read in the useful bits
501             ar & make_nvp("language_options", language);
502             ar & make_nvp("macro_definitions", macros);
503             ar & make_nvp("include_settings", includes);
504         }
505         catch (boost::wave::preprocess_exception const& e) {
506             // catch version mismatch exceptions and call error handler
507             get_hooks().throw_exception(derived(), e);
508         }
509     }
510     BOOST_SERIALIZATION_SPLIT_MEMBER()
511 #endif
512 
513 private:
514     // the main input stream
515     target_iterator_type first;         // underlying input stream
516     target_iterator_type last;
517     std::string filename;               // associated main filename
518     bool has_been_initialized;          // set cwd once
519 #if BOOST_WAVE_SUPPORT_PRAGMA_ONCE != 0
520     std::string current_filename;       // real name of current preprocessed file
521 #endif
522     std::string current_relative_filename;        // real relative name of current preprocessed file
523 
524     boost::wave::util::if_block_stack ifblocks;   // conditional compilation contexts
525     boost::wave::util::include_paths includes;    // lists of include directories to search
526     iteration_context_stack_type iter_ctxs;       // iteration contexts
527     macromap_type macros;                         // map of defined macros
528     boost::wave::language_support language;       // supported language/extensions
529     hook_policy_type hooks;                       // hook policy instance
530 };
531 
532 ///////////////////////////////////////////////////////////////////////////////
533 }   // namespace wave
534 }   // namespace boost
535 
536 #if BOOST_WAVE_SERIALIZATION != 0
537 namespace boost { namespace serialization {
538 
539 template<
540     typename Iterator, typename LexIterator,
541     typename InputPolicy, typename Hooks
542 >
543 struct tracking_level<boost::wave::context<Iterator, LexIterator, InputPolicy, Hooks> >
544 {
545     typedef mpl::integral_c_tag tag;
546     typedef mpl::int_<track_never> type;
547     BOOST_STATIC_CONSTANT(
548         int,
549         value = tracking_level::type::value
550     );
551 };
552 
553 template<
554     typename Iterator, typename LexIterator,
555     typename InputPolicy, typename Hooks
556 >
557 struct version<boost::wave::context<Iterator, LexIterator, InputPolicy, Hooks> >
558 {
559     typedef boost::wave::context<Iterator, LexIterator, InputPolicy, Hooks>
560         target_type;
561     typedef mpl::int_<target_type::version> type;
562     typedef mpl::integral_c_tag tag;
563     BOOST_STATIC_CONSTANT(unsigned int, value = version::type::value);
564 };
565 
566 }}  // namespace boost::serialization
567 #endif
568 
569 // the suffix header occurs after all of the code
570 #ifdef BOOST_HAS_ABI_HEADERS
571 #include BOOST_ABI_SUFFIX
572 #endif
573 
574 #endif // !defined(BOOST_CPP_CONTEXT_HPP_907485E2_6649_4A87_911B_7F7225F3E5B8_INCLUDED)
575