1 reno_project 2 reno_config ../..;../../../../boost .*\.(cpp|hpp|h)$ 3 reno_layer_map 7 default 4 reno_layer 38 0 5 reno_context 0 1 <string>transporting of arbitrary data to the catch site</string> tutorial_transporting_data 1 2 (:include include:) (:auto also:) 0 6 reno_context 2 5D77D35C34EE3A1CF65AF8A54984D895F7FD5E5F61B51F1C00141EE26184826F 2896829895 4094 775 CF9032A2CB14D66F0F004C0AFDE2BB94321F405D6D95AC46EC5350AB4843A4F1 1073329133 715 243 0 ../../../../boost/exception/info.hpp 0 0 <string>error_info</string> 1 2 (:include include:) (:auto also:) 0 7 reno_context 2 798A43A58F30121B93FAAFE41BA02B933B5D189D95176607ADFC01796014F7D0 605377366 7735 323 C4D6D690002735564AC480CEA72750731857C50F8E92B19420561B4CBBDA0748 1783445013 1182 3164 0 ../../../../boost/exception/exception.hpp 0 0 <string>exception</string> 1 2 (:include include:) ---- !!!See Also: (:pagelist link="backlink" except_tags="exception,member" mod="w":) 0 8 reno_context 1 EB34EBE3F1C68865DE1F02FD88687E670BAE694282DAC893A537F30DDCD57FA3 3701809375 11225 323 0 ../../../../boost/exception_ptr.hpp 0 0 <string>boost/exception_ptr.hpp</string> exception_cloning_hpp 1 2 (:include include:) (:auto also:) 0 9 reno_context 1 F4C951B28F7DE500973AA3DFAA99F2BADA6EDAFA2B406C30BEF3B7FBE6FD57D7 2263754923 982 306 0 ../../example/error_info_2.cpp 0 0 <string>adding of arbitrary data to active exception objects</string> adding_data_later 0 0 10 reno_context 3 798A43A58F30121B93FAAFE41BA02B933B5D189D95176607ADFC01796014F7D0 605377366 7735 323 C4D6D690002735564AC480CEA72750731857C50F8E92B19420561B4CBBDA0748 1783445013 1182 3164 B805EBBE01B97F9E8E0306870AFA083BD42C2F04A72EE945E4D2161860B720AB 269617501 51 245 0 ../../../../boost/exception/exception.hpp 0 0 <string>exception::exception</string> exception_constructors 1 2 (:include include:) (:auto also:) 0 11 reno_context 2 5D77D35C34EE3A1CF65AF8A54984D895F7FD5E5F61B51F1C00141EE26184826F 2896829895 4094 775 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also:) 0 18 reno_context 1 D9B8E6AA12A4F33953B1A961FA590C5A3840234B6531CA8C04AC985AD5800835 2432554768 702 408 0 ../../example/enable_error_info.cpp 0 0 <string>integrating boost exception in existing exception class hierarchies</string> tutorial_enable_error_info 1 2 (:include include:) (:auto also:) 0 19 reno_context 2 78F37A2801CADB066084578244BC93958EAD33507F30C07353EA7D161FFBF973 2089604779 11016 532 C84057F7B3954843F5360E9764B35DC5EB1D8ED65CA9F1B6B633D95B417E3AA9 1591300832 2322 1609 0 ../../../../boost/exception_ptr.hpp 0 0 <string>exception_ptr</string> 1 2 (:include include:) (:auto also:) 0 20 reno_context 2 798A43A58F30121B93FAAFE41BA02B933B5D189D95176607ADFC01796014F7D0 605377366 7735 323 DF9EA87B0140AACF4422F1B76F6A6A409C15F32858BBBA85A35981A824C56BA9 1137981799 192 7455 0 ../../../../boost/exception/exception.hpp 0 0 <string>enable_current_exception</string> 1 2 (:include include:) (:auto also:) 0 21 reno_context 0 1 <string>boost exception</string> boost-exception 107 2 !!Introduction The purpose of Boost Exception is to ease the design of exception class hierarchies and to help write exception handling and error reporting code. It supports transporting of arbitrary data to the catch site, which is otherwise tricky due to the no-throw requirements (15.5.1) for exception types. Data can be added to any exception object, either directly in the throw-expression (15.1), or at a later time as the exception object propagates up the call stack. The ability to add data to exception objects after they have been passed to throw is important, because often some of the information needed to handle an exception is unavailable in the context where the failure is detected. Boost Exception also supports (:link http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html|N2179:)-style (:link 1 0 22 reno_context 0 1 <string>transporting of exceptions between threads</string> tutorial_exception_ptr 2 |copying:) of exception objects, implemented non-intrusively and automatically by the boost::(:link 1 0 23 reno_context 2 612485E090D76B2CC43C1A296F813075BA165C2496082E78E939F10B3DA8E09A 1770110914 587 1225 60F3F48B87487FA6E0D2CCC0750AF435CC92CEC80BBBF609AC71295031AADD0D 3929437933 361 213 0 ../../../../boost/throw_exception.hpp 0 0 <string>throw_exception</string> 2 :) function. !!Contents #Tutorial ##(:link 1 0 -5 2 mod="w":) ##(:link 1 0 -18 2 mod="w":) ##(:link 1 0 -22 2 mod="w":) ##(:link 1 0 24 reno_context 1 CE411E21EE9878B55B5906D033A0FC52574FB59D8A8CECB75405E9B1C9D782DB 1173443713 308 302 0 ../../example/logging.cpp 0 0 <string>diagnostic information</string> tutorial_diagnostic_information 2 mod="w":) #Documentation ##Class (:link 1 0 -7 2 :) ##Transporting of Arbitrary Data to the Catch Site ###(:link 1 0 -6 2 :) ###(:link 1 0 -11 2 :) ###(:link 1 0 -15 2 :) ###(:link 1 0 25 reno_context 2 316E7826A34AB7412F671B91F1115D9000953DA08C941AF99D28140ECDEEB6A6 718983169 1570 504 FF9587851F54F772BCD4A548BC28D9CEB5FA00C61CBFC064568FD4F1E19AEC33 535614227 676 888 0 ../../../../boost/exception/get_error_info.hpp 0 0 <string>get_error_info</string> 2 :) ###(:link 1 0 26 reno_context 2 798A43A58F30121B93FAAFE41BA02B933B5D189D95176607ADFC01796014F7D0 605377366 7735 323 B4D37C317A3B45825DDA1A8C8B1CE71CC2E530D15090D05995FCBEC4247F49C4 2742768198 258 5736 0 ../../../../boost/exception/exception.hpp 0 0 <string>enable_error_info</string> 2 :) ###(:link 1 0 27 reno_context 1 49D31376D97691F7C84A134B5D8C7C66EF1ED6901D376CA250D634AE2B38AB5E 549270010 163 610 0 ../../../../boost/exception/info.hpp 0 0 <string>BOOST_ERROR_INFO</string> 2 :) ##(:link http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html|N2179:) Transporting of Exceptions between Threads ###(:link 1 0 -19 2 :) ###(:link 1 0 -20 2 :) ###(:link 1 0 28 reno_context 2 78F37A2801CADB066084578244BC93958EAD33507F30C07353EA7D161FFBF973 2089604779 11016 532 7890935423C731BD8E7DE2820DF7E85C72126B2EAB9A45B0AAFA5749DD1A9D57 2497085175 2528 8066 0 ../../../../boost/exception_ptr.hpp 0 0 <string>current_exception</string> 2 :) ###(:link 1 0 29 reno_context 2 78F37A2801CADB066084578244BC93958EAD33507F30C07353EA7D161FFBF973 2089604779 11016 532 F87D7E0321BDDAE23D5A6667CB12116411468AEC54E3B35FB9C8CA94BFECA41E 1149388739 296 10596 0 ../../../../boost/exception_ptr.hpp 0 0 <string>copy_exception</string> 2 :) ###(:link 1 0 30 reno_context 2 78F37A2801CADB066084578244BC93958EAD33507F30C07353EA7D161FFBF973 2089604779 11016 532 4B6ED02EA5B5A3B326838794C37ED01C5DC3E8D89FA78E62B9F7A0C78D4DB6FD 2715164371 116 10894 0 ../../../../boost/exception_ptr.hpp 0 0 <string>rethrow_exception</string> 2 :) ###(:link 1 0 -17 2 :) ##(:link 1 0 31 reno_context 2 214D17B425C1C447F952970DA6B1A778AD45CCA513405EB2DA6EBE87285A852A 1906283610 2414 457 6B355BB18EB534B5221822257C7A7F834692C7256E5D118F5443C7D905731578 1509743294 810 1598 0 ../../../../boost/exception/diagnostic_information.hpp 0 0 <string>diagnostic_information</string> 2 :) ##(:link 1 0 -23 2 :) ##Headers ###(:link 1 0 32 reno_context 1 6AF18E00A3BB3D35F83A4F81619F7BD079E08E2BF3F4CE6F218045A2DF9701FA 348421341 341 323 0 ../../../../boost/exception.hpp 0 0 <string>boost/exception.hpp</string> exception_hpp 2 :) ###(:link 1 0 33 reno_context 1 FED4CEA991FBBA8DF26B5652CE68C929C38BEE74DFD6C8E89E2A623BF0A61503 1244906377 2548 323 0 ../../../../boost/exception/diagnostic_information.hpp 0 0 <string>boost/exception/diagnostic_information.hpp</string> 2 :) ###(:link 1 0 34 reno_context 2 9A4ECF9A49A73AED83C1565CB8C67AE1519E8AFE6818F968B4C4733CB9E86CEF 1615599655 68 227 34F0583BC8DE767CE2D79721E1F956895E43E5397473B1050F59BE7E26C773DB 805836816 66 1 0 ../../../../boost/exception/error_info.hpp 0 0 <string>boost/exception/error_info.hpp</string> exception_error_info_value_hpp 2 :) ###(:link 1 0 35 reno_context 1 798A43A58F30121B93FAAFE41BA02B933B5D189D95176607ADFC01796014F7D0 605377366 7735 323 0 ../../../../boost/exception/exception.hpp 0 0 <string>boost/exception/exception.hpp</string> exception_exception_hpp 2 :) ###(:link 1 0 36 reno_context 1 3FB3FF960AB73CFA030B0B3BF9B9B0E4DF6534F39E22EFCD3FD44C240DC1A650 3103461725 1751 323 0 ../../../../boost/exception/get_error_info.hpp 0 0 <string>boost/exception/get_error_info.hpp</string> 2 :) ###(:link 1 0 37 reno_context 1 BA1771AE0820845A4FBA4958AD943C4AE6F331ED91EFB29CC74357A9193B79D7 1140438873 4546 323 0 ../../../../boost/exception/info.hpp 0 0 <string>boost/exception/info.hpp</string> exception_error_info_hpp 2 :) ###(:link 1 0 -13 2 :) ###(:link 1 0 -8 2 :) ###(:link 1 0 38 reno_context 1 FC79C34F05028DB122154492FBB2B8F0EB3EFDCAA30A48C30E3A7E7EBD67E672 4099021562 1741 91 0 ../../../../boost/throw_exception.hpp 0 0 <string>boost/throw_exception.hpp</string> throw_exception_hpp 2 :) #(:link 1 0 39 reno_context 0 1 <string>Index</string> name_idx 2 :) !!Synopsis `#include <(:link 1 0 -32 2 :)> [@namespace boost { (:include 1 0 -35 2 api pre_indent="4":) (:include 1 0 -37 2 api pre_indent="4":) (:include 1 0 -13 2 api pre_indent="4":) (:include 1 0 -33 2 api pre_indent="4":) (:include 1 0 -8 2 api pre_indent="4":) (:include 1 0 -38 2 api pre_indent="4":) }@] !!Class exception (:include 1 0 -7 2 :) !!Transporting of Arbitrary Data to the Catch Site (:include 1 0 -6 2 :) (:include 1 0 -11 2 :) (:include 1 0 -15 2 :) (:include 1 0 -25 2 :) (:include 1 0 -26 2 :) (:include 1 0 -27 2 :) !!Transporting of Exceptions between Threads (:include 1 0 -19 2 :) (:include 1 0 -20 2 :) (:include 1 0 -28 2 :) (:include 1 0 -29 2 :) (:include 1 0 -30 2 :) (:include 1 0 -17 2 :) !!Printing Diagnostic Information (:include 1 0 -31 2 :) !!Throwing Exceptions (:include 1 0 -23 2 :) !!Acknowledgements Peter Dimov has been continuously influencing the design and evolution of Boost Exception. Also thanks to Tobias Schwinger, Tom Brinkman, Pavel Vozenilek and everyone who participated in the review process. 0 -22 1 2 (:include include:) (:auto also:) 0 -23 1 2 (:include include:) (:auto also:) 0 -29 1 2 (:include include:) (:auto also:) 0 -24 1 2 (:include include:) (:auto also:) 0 -25 1 2 (:include include:) (:auto also:) 0 -26 1 2 (:include include:) (:auto also:) 0 -27 1 2 (:include include:) (:auto also:) 0 -30 1 2 (:include include:) (:auto also:) 0 40 reno_context 2 798A43A58F30121B93FAAFE41BA02B933B5D189D95176607ADFC01796014F7D0 605377366 7735 323 17E691632123EB67BA67D590B49EB8094F462F5A10A66A1C5438E1867EF1478E 765399792 77 4348 0 ../../../../boost/exception/exception.hpp 0 0 <string>exception::~exception</string> exception_destructor 1 2 (:include include:) (:auto also:) 0 -28 1 2 (:include include:) (:auto also:) 0 -31 1 2 (:include include:) (:auto also:) 0 -33 1 2 (:include include:) (:auto also:) 0 -32 1 2 (:include include:) (:auto also:) 0 -34 1 2 (:include include:) (:auto also:) 0 -35 1 2 (:include include:) (:auto also:) 0 -36 1 2 (:include include:) (:auto also:) 0 -37 1 2 (:include include:) (:auto also:) 0 -38 1 2 (:include include:) (:auto also:) 0 -39 1 2 (:auto !:) (:pagelist fmt="index" except_tags="index,noindex" mod="w":) 0 41 reno_context 1 E444EE9697EEADFDE0767E1D0242FC0E70D98E61FB1F0FFA099648DE509B82F3 94503238 773 374 0 ../../example/info_tuple.cpp 0 0 <string>adding grouped data to exceptions</string> grouping_data 0 0 42 reno_context 1 FC684D0DD5A9732B4130F2AB3DB6E0491D0F523E14B7FB738B2019EA2C7F8717 2229778754 631 319 0 ../../example/cloning_2.cpp 0 0 <string>cloning and re-throwing an exception</string> cloning_and_rethrowing 0 def 43 reno_layer 38 0 -5 0 0 -6 3 2 [@template <class Tag,class T> class (:link 1 0 -6 2 :) { public: typedef T value_type; error_info( value_type const & ); };@] 0 -7 9 2 [@class (:link 1 0 -7 2 :) { public: (:include 1 0 -16 2 decl pre_indent="4":) protected: (:include 1 0 -10 2 decl pre_indent="4":) (:include 1 0 -40 2 decl pre_indent="4":) };@] 0 -8 0 0 -9 0 0 -10 0 0 -11 0 0 -12 0 0 -13 0 0 -14 0 0 -15 0 0 -16 0 0 -17 0 0 -18 0 0 -19 0 0 -20 0 0 -21 0 0 -22 0 0 -23 0 0 -29 0 0 -24 0 0 -25 0 0 -26 0 0 -27 0 0 -30 0 0 -40 0 0 -28 0 0 -31 0 0 -33 0 0 -32 0 0 -34 0 0 -35 0 0 -36 0 0 -37 0 0 -38 0 0 -39 0 0 -41 0 0 -42 0 api 44 reno_layer 38 0 -5 0 0 -6 0 0 -7 0 0 -8 11 2 [@(:include 1 0 -17 2 decl:) (:include 1 0 -19 2 decl:) (:include 1 0 -29 2 decl:) (:include 1 0 -28 2 decl:) (:include 1 0 -30 2 decl:)@] 0 -9 0 0 -10 0 0 -11 0 0 -12 0 0 -13 3 2 [@(:include 1 0 -15 2 decl:)@] 0 -14 0 0 -15 0 0 -16 0 0 -17 0 0 -18 0 0 -19 0 0 -20 0 0 -21 0 0 -22 0 0 -23 0 0 -29 0 0 -24 0 0 -25 0 0 -26 0 0 -27 0 0 -30 0 0 -40 0 0 -28 0 0 -31 0 0 -33 3 2 [@(:include 1 0 -31 2 decl:)@] 0 -32 17 2 [@#include <(:link 1 0 -33 2 :)> #include <(:link 1 0 -34 2 :)> #include <(:link 1 0 -35 2 :)> #include <(:link 1 0 -36 2 :)> #include <(:link 1 0 -37 2 :)> #include <(:link 1 0 -13 2 :)> #include <(:link 1 0 -8 2 :)> #include <(:link 1 0 -38 2 :)>@] 0 -34 3 2 [@(:include 1 0 -6 2 decl:)@] 0 -35 7 2 [@(:include 1 0 -7 2 def:) (:include 1 0 -26 2 decl:) (:include 1 0 -20 2 decl:)@] 0 -36 3 2 [@(:include 1 0 -25 2 decl:)@] 0 -37 7 2 [@(:include 1 0 -6 2 def:) (:include 1 0 -27 2 decl:) (:include 1 0 -11 2 decl:)@] 0 -38 3 2 [@(:include 1 0 -23 2 decl:)@] 0 -39 0 0 -41 0 0 -42 0 decl 45 reno_layer 38 0 -5 0 0 -6 3 2 [@template <class Tag,class T> class (:link 1 0 -6 2 :);@] 0 -7 3 2 [@class 1 0 -7 2 ;@] 0 -8 0 0 -9 0 0 -10 7 2 [@(:link 1 0 -10 2 mod="m":)(); (:link 1 0 -10 2 mod="m":)( (:link 1 0 -7 2 :) const & x );@] 0 -11 5 2 [@template <class E, class Tag, class T> E const & (:link 1 0 -11 2 |operator<<:)( E const & x, (:link 1 0 -6 2 :)<Tag,T> const & v );@] 0 -12 0 0 -13 0 0 -14 0 0 -15 7 2 [@template <class E, class Tag1, class T1, ..., class TagN, class TN> E const & (:link 1 0 -15 2 |operator<<:)( E const & x, (:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html|tuple:)< (:link 1 0 -6 2 :)<Tag1,T1>, ..., (:link 1 0 -6 2 :)<TagN,TN> > const & v );@] 0 -16 3 2 [@virtual char const * (:link 1 0 -16 2 mod="m":)() const throw();@] 0 -17 5 2 [@class (:link 1 0 -17 2 :): public std::exception public boost:: 1 0 -7 2 { ---unspecified--- };@] 0 -18 0 0 -19 3 2 [@typedef ---unspecified--- (:link 1 0 -19 2 :);@] 0 -20 3 2 [@template <class T> ---unspecified--- (:link 1 0 -20 2 :)( T const & e );@] 0 -21 0 0 -22 0 0 -23 5 2 [@#ifdef BOOST_NO_EXCEPTIONS void (:link 1 0 -23 2 :)( std::exception const & e ); // user defined #else template <class E> void (:link 1 0 -23 2 :)( E const & e ); #endif@] 0 -29 5 2 [@template <class T> (:link 1 0 -19 2 :) (:link 1 0 -29 2 :)( T const & e );@] 0 -24 0 0 -25 3 2 [@template <class ErrorInfo,class E> (:link http://www.boost.org/libs/smart_ptr/shared_ptr.htm|shared_ptr:)<typename ErrorInfo::value_type const> (:link 1 0 -25 2 :)( E const & x );@] 0 -26 3 2 [@template <class T> ---unspecified--- (:link 1 0 -26 2 :)( T const & x );@] 0 -27 9 2 [@typedef (:link 1 0 -6 2 :)<struct tag_throw_function,char const *> throw_function; typedef (:link 1 0 -6 2 :)<struct tag_throw_file,char const *> throw_file; typedef (:link 1 0 -6 2 :)<struct tag_throw_line,int> throw_line; #define (:link 1 0 -27 2 :)\ ::boost::throw_function(BOOST_CURRENT_FUNCTION) <<\ ::boost::throw_file(__FILE__) <<\ ::boost::throw_line((int)__LINE__)@] 0 -30 5 2 [@void (:link 1 0 -30 2 :)( (:link 1 0 -19 2 :) const & ep ); 0 -40 3 2 [@(:link 1 0 -40 2 mod="m":)();@] 0 -28 5 2 [@(:link 1 0 -19 2 :) (:link 1 0 -28 2 :)();@] 0 -31 3 2 [@template <class T> std::string (:link 1 0 -31 2 :)( T const & x );@] 0 -33 0 0 -32 0 0 -34 0 0 -35 0 0 -36 0 0 -37 0 0 -38 0 0 -39 0 0 -41 0 0 -42 0 include 46 reno_layer 38 0 -5 11 2 (:auto !!:) All exception types that derive from boost::(:link 1 0 -7 2 :) can be used as type-safe containers of arbitrary data objects, while complying with the no-throw requirements (15.5.1) of the ANSI C++ standard for exception types. Data can be added to a boost::(:link 1 0 -7 2 :) at the time of the throw, or at a later time. (:include 1 0 -12 2 :) (:include 1 0 -9 2 :) (:include 1 0 -41 2 :) 0 -6 25 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: T must have accessible copy constructor and must not be a reference (there is no requirement that T's copy constructor does not throw.) !!!!Description: This class template is used to associate a Tag type with a value type T. Objects of type (:link 1 0 -6 2 :)<Tag,T> can be passed to (:link 1 0 -11 2 |operator<<:) to be stored in objects of type boost::(:link 1 0 -7 2 :). !!!!Note: The header <(:link 1 0 -34 2 :)> provides a declaration of the (:link 1 0 -6 2 :) template, which is sufficient for the purpose of typedefing an instance for specific Tag and T, like this: [@#include <(:link 1 0 -34 2 :)> typedef boost::(:link 1 0 -6 2 :)<struct tag_errno,int> errno_info;@] Of course, to actually add an (:link 1 0 -6 2 :) object to (:link 1 0 -7 2 mod="p":) using (:link 1 0 -11 2 |operator<<:), or to retrieve it using (:link 1 0 -25 2 :), you must first #include <(:link 1 0 -37 2 :)>. 0 -7 19 2 (:auto !!!:) (:include synopsis:) Class boost::(:link 1 0 -7 2 :) is designed to be used as a universal base for user-defined exception types. An object of any type deriving from boost::(:link 1 0 -7 2 :) can store data of arbitrary types, using the (:link 1 0 -6 2 :) wrapper and (:link 1 0 -11 2 |operator<<:). To retrieve data from a boost::(:link 1 0 -7 2 :) object, use the (:link 1 0 -25 2 :) function template. (:include 1 0 -10 2 :) (:include 1 0 -40 2 :) (:include 1 0 -16 2 :) 0 -8 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -9 21 2 (:auto !!!:) Sometimes the throw site does not have all the information that is needed at the catch site to make sense of what went wrong. Here is an example: [@#include <stdio.h> #include <string> class file_read_error { public: explicit file_read_error( std::string const & fn ): fn_(fn) { }; std::string const & file_name() const { return fn_; } private: std::string fn_; }; void file_read( FILE * f, void * buffer, size_t size ) { if( size!=fread(buffer,1,size,f) ) throw file_read_error("????"); }@] We have defined an exception class file_read_error which can store a file name, so that when we catch a file_read_error object, we know which file the failure is related to. However, the file_read function does not have the file name at the time of the throw; all it has is a FILE handle. One possible solution is to not use FILE handles directly. We could have our own class file which stores both a FILE handle and a file name, and pass that to file_read. However, this could be problematic if we communicate with 3rd party code that does not use our class file (probably because they have their own similar class.) A better solution is to make class file_read_error derive (possibly indirectly) from boost::(:link 1 0 -7 2 :), and free the file_read function from the burden of storing the file name in exceptions it throws: [@#include <(:link 1 0 -32 2 :)> #include <stdio.h> #include <errno.h> typedef boost::(:link 1 0 -6 2 :)<struct tag_errno,int> errno_info; class file_read_error: public boost::(:link 1 0 -7 2 :) { }; void file_read( FILE * f, void * buffer, size_t size ) { if( size!=fread(buffer,1,size,f) ) throw file_read_error() << errno_info(errno); }@] If file_read detects a failure, it throws an exception which contains the information that is available at the time, namely the errno. Other relevant information, such as the file name, can be added in a context higher up the call stack, where it is known naturally: [@#include <(:link 1 0 -32 2 :)> #include <boost/shared_ptr.hpp> #include <stdio.h> #include <string> typedef boost::(:link 1 0 -6 2 :)<struct tag_file_name,std::string> file_name_info; boost::shared_ptr<FILE> file_open( char const * file_name, char const * mode ); void file_read( FILE * f, void * buffer, size_t size ); void parse_file( char const * file_name ) { boost::shared_ptr<FILE> f = file_open(file_name,"rb"); assert(f); try { char buf[1024]; file_read( f.get(), buf, sizeof(buf) ); } catch( boost::(:link 1 0 -7 2 :) & e ) { e << file_name_info(file_name); throw; } }@] The above function is (almost) exception-neutral -- if an exception is emitted by any function call within the try block, parse_file does not need to do any real work, but it intercepts any boost::(:link 1 0 -7 2 :) object, stores the file name, and re-throws using a throw-expression with no operand (15.1.6). The rationale for catching any boost::(:link 1 0 -7 2 :) object is that the file name is relevant to any failure that occurs in parse_file, ''even if the failure is unrelated to file I/O''. As usual, the stored data can be retrieved using (:link 1 0 -25 2 :). 0 -10 7 2 (:auto !!!:) (:include decl:) !!!!Effects: * Default constructor: initializes an empty boost::(:link 1 0 -7 2 :) object. * Copy constructor: initializes a boost::(:link 1 0 -7 2 :) object which shares with x all data added through (:link 1 0 -11 2 |operator<<:), including data that is added at a future time. !!!!Throws: Nothing. 0 -11 7 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: E must be boost::(:link 1 0 -7 2 :), or a type that derives (indirectly) from boost::(:link 1 0 -7 2 :). !!!!Effects: Stores a copy of v into x. If x already contains data of type (:link 1 0 -6 2 :)<Tag,T>, that data is overwritten. !!!!Returns: x. (:include throws:) 0 -12 17 2 (:auto !!!:) The following example demonstrates how errno can be stored in exception objects using Boost Exception: [@#include <(:link 1 0 -32 2 :)> #include <errno.h> #include <iostream> typedef boost::(:link 1 0 -6 2 :)<struct tag_errno,int> errno_info; //(1) class my_error: public boost::(:link 1 0 -7 2 :), public std::exception { }; //(2) void f() { throw my_error() << errno_info(errno); //(3) } @] First, we instantiate the (:link 1 0 -6 2 :) template using a unique identifier -- tag_errno, and the type of the info it identifies -- int. This provides compile-time type safety for the various values stored in exception objects. Second, we define class my_error, which derives from boost::(:link 1 0 -7 2 :). Finally, (3) illustrates how the typedef from (1) can be used with (:link 1 0 -11 2 |operator<<:) to store values in exception objects at the point of the throw. The stored errno value can be recovered at a later time like this: [@// ...continued void g() { try { f(); } catch( my_error & x ) { if( boost::shared_ptr<int const> err=boost::(:link 1 0 -25 2 :)<errno_info>(x) ) std::cerr << "Error code: " << *err; } }@] The (:link 1 0 -25 2 :) function template is instantiated with the typedef from (1), and is passed an exception object of a polymorphic type. If the exception object contains the requested value, the returned (:link http://www.boost.org/libs/smart_ptr/shared_ptr.htm|shared_ptr:) will point to it; otherwise an empty (:link http://www.boost.org/libs/smart_ptr/shared_ptr.htm|shared_ptr:) is returned. 0 -13 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -14 11 2 (:auto !!!:) Here is how cloning can be enabled in a throw-expression (15.1): [@#include <(:link 1 0 -37 2 :)> #include <stdio.h> #include <errno.h> typedef boost::error_info<struct tag_errno,int> errno_info; class file_read_error: public boost::(:link 1 0 -7 2 :) { }; void file_read( FILE * f, void * buffer, size_t size ) { if( size!=fread(buffer,1,size,f) ) throw boost::(:link 1 0 -20 2 :)(file_read_error()) << errno_info(errno); }@] Of course, (:link 1 0 -20 2 :) may be used with any exception type; there is no requirement that it should derive from boost::(:link 1 0 -7 2 :). 0 -15 5 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: E must be boost::(:link 1 0 -7 2 :), or a type that derives (indirectly) from boost::(:link 1 0 -7 2 :). !!!!Effects: Equivalent to x << v.(:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html#accessing_elements|get:)<0>() << ... << v.(:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html#accessing_elements|get:)<N>(). !!!!Returns: x. (:include throws:) 0 -16 15 2 (:auto !!!:) (:include decl:) !!!!Returns: A string representation of all data stored in the boost::(:link 1 0 -7 2 :) object by the (:link 1 0 -11 2 |operator<<:) function. See "(:link 1 0 -24 2 mod="w":)" for details. !!!!Throws: Nothing. !!!!Notes: *The return value remains valid until the exception object from which it was obtained is destroyed or modified. *The header (:link 1 0 -33 2 :) provides a namespace-scope function (:link 1 0 -31 2 :) which works with any exception. If its argument can be converted to boost::(:link 1 0 -7 2 :), the output from (:link 1 0 -16 2 :) is combined with other implementation-defined information into a std::string. 0 -17 5 2 (:auto !!!:) (:include synopsis:) This type is used by the (:link 1 0 -19 2 :) support in Boost Exception. Please see (:link 1 0 -28 2 :). 0 -18 27 2 (:auto !!:) Some exception hierarchies can not be modified to make boost::(:link 1 0 -7 2 :) a base type. In this case, the (:link 1 0 -26 2 :) function template can be used to make exception objects derive from boost::(:link 1 0 -7 2 :) anyway. Here is an example: [@#include <(:link 1 0 -32 2 :)> #include <stdexcept> typedef boost::(:link 1 0 -6 2 :)<struct tag_std_range_min,size_t> std_range_min; typedef boost::(:link 1 0 -6 2 :)<struct tag_std_range_max,size_t> std_range_max; typedef boost::(:link 1 0 -6 2 :)<struct tag_std_range_index,size_t> std_range_index; template <class T> class my_container { public: size_t size() const; T const & operator[]( size_t i ) const { if( i > size() ) throw boost::(:link 1 0 -26 2 :)(std::range_error("Index out of range")) << std_range_min(0) << std_range_max(size()) << std_range_index(i); //.... } }; @] The call to (:link 1 0 -26 2 :)<T> gets us an object of ''unspecified type'' which is guaranteed to derive from both boost::(:link 1 0 -7 2 :) and T. This makes it possible to use (:link 1 0 -11 2 |operator<<:) to store additional information in the exception object. The exception can be intercepted as T &, so existing exception handling will not break. It can also be intercepted as boost::(:link 1 0 -7 2 :) &, so that (:link 1 0 -5 2 |more information can be added to the exception at a later time:). 0 -19 17 2 (:auto !!!:) (:include synopsis:) The (:link 1 0 -19 2 :) type can be used to refer to a copy of an exception object. It is Default Constructible, Copy Constructible, Assignable and Equality Comparable; (:link 1 0 -19 2 :)'s operations do not throw. Two instances of (:link 1 0 -19 2 :) are equivalent and compare equal if and only if they refer to the same exception. The default constructor of (:link 1 0 -19 2 :) produces the null value of the type. The null value is equivalent only to itself. !!!!Thread safety * It is legal for multiple threads to hold (:link 1 0 -19 2 :) references to the same exception object. * It is illegal for multiple threads to modify the same (:link 1 0 -19 2 :) object concurrently. * While calling 1 0 -28 2 makes a copy of the current exception object, it is still possible for the two copies to share internal state. Therefore, in general it is not safe to call 1 0 -30 2 to throw the same exception object concurrently into multiple threads. 0 -20 21 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: T must be a class with an accessible no-throw copy constructor. !!!!Returns: An object of ''unspecified'' type which derives publicly from T. That is, the returned object can be intercepted by a catch(T &). !!!!Description: This function is designed to be used directly in a throw-expression to enable the (:link 1 0 -19 2 :) support in Boost Exception. For example: [@class my_exception: public std::exception { }; .... throw boost::(:link 1 0 -20 2 :)(my_exception());@] Unless (:link 1 0 -20 2 :) is called at the time an exception object is used in a throw-expression, an attempt to copy it using (:link 1 0 -28 2 :) may return an (:link 1 0 -19 2 :) which refers to an instance of (:link 1 0 -17 2 :). See (:link 1 0 -28 2 :) for details. !!!!Note: Instead of using the throw keyword directly, it is preferable to call boost::(:link 1 0 -23 2 :). This is guaranteed to throw an exception that derives from boost::(:link 1 0 -7 2 :) and supports the (:link 1 0 -19 2 :) functionality. 0 -21 0 0 -22 11 2 (:auto !!:) Boost Exception supports transporting of exception objects between threads through cloning. This system is similar to (:link http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html|N2179:), but because Boost Exception can not rely on language support, the use of (:link 1 0 -20 2 :) at the time of the throw is required in order to use cloning. !!!!Note: All exceptions emitted by the familiar function boost::(:link 1 0 -23 2 :) are guaranteed to derive from boost::(:link 1 0 -7 2 :) and to support cloning. (:include 1 0 -14 2 :) (:include 1 0 -42 2 :) 0 -23 13 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: E must derive publicly from std::exception. !!!!Effects: * If BOOST_NO_EXCEPTIONS is not defined, boost::(:link 1 0 -23 2 :)(e) is equivalent to throw boost::(:link 1 0 -20 2 :)(boost::(:link 1 0 -26 2 :)(e)), unless BOOST_EXCEPTION_DISABLE is defined, in which case boost::(:link 1 0 -23 2 :)(e) is equivalent to throw e; * If BOOST_NO_EXCEPTIONS is defined, the function is left undefined, and the user is expected to supply an appropriate definition. Callers of 1 0 -23 2 are allowed to assume that the function never returns; therefore, if the user-defined 1 0 -23 2 returns, the behavior is undefined. 0 -29 3 2 (:auto !!!:) (:include synopsis:) !!!!Effects: As if try { throw e; } catch( ... ) { return (:link 1 0 -28 2 :)(); } 0 -24 21 2 (:auto !!:) Class boost::(:link 1 0 -7 2 :) provides a virtual member function (:link 1 0 -16 2 mod="m":), with a signature similar to the familiar std::exception::what function. The default implementation returns a string value that is not presentable as a friendly user message, but because it is generated automatically, it is useful for debugging or logging purposes. Here is an example: [@#include <(:link 1 0 -32 2 :)> #include <iostream> void f(); //throws unknown types that derive from boost::(:link 1 0 -7 2 :). void g() { try { f(); } catch( boost::(:link 1 0 -7 2 :) & e ) { std::cerr << e.(:link 1 0 -16 2 mod="m":)(); } }@] The (:link 1 0 -16 2 mod="m":) member function iterates over all data objects stored in the boost::(:link 1 0 -7 2 :) through (:link 1 0 -11 2 |operator<<:). The returned string is constructed by converting each data object to string and then concatenating these strings together. When the (:link 1 0 -6 2 :)<Tag,T> template is instantiated, the system attempts overload resolution for an unqualified call to to_string(x), where x is of type T. If this is successful, the to_string overload is expected to return std::string and is used to convert objects of type T to string. Otherwise, the system attempts overload resolution for s << x, where s is a std::ostringstream and x is of type T. If this is successful, the operator<< overload is used to convert objects of type T to string. Otherwise the system is unable to convert objects of type T to string, and an unspecified stub string value is used without issuing a compile error. 0 -25 9 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: * ErrorInfo must be an instance of the (:link 1 0 -6 2 :) template. * E must be polymorphic. * The 1 0 -25 2 function must not be called outside of a catch block. !!!!Returns: * If dynamic_cast<boost::(:link 1 0 -7 2 :) const *>(&x) is 0, or if x does not store an object of type ErrorInfo, the returned value is an empty shared_ptr. * Otherwise, the returned shared_ptr points to the stored value (use (:link 1 0 -11 2 |operator<<:) to store values in exception objects.) The shared_ptr is valid even after x has been destroyed. !!!!Throws: Nothing. 0 -26 5 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: T must be a class with an accessible no-throw copy constructor as per (15.5.1). !!!!Returns: * If T derives from boost::(:link 1 0 -7 2 :), the returned object is of type T and is a copy of x. * Otherwise, the returned object is of an unspecified type that derives publicly from both T and boost::(:link 1 0 -7 2 :). The T sub-object is initialized from x by the T copy constructor. !!!!Throws: Nothing. 0 -27 7 2 (:auto !!!:) (:include synopsis:) This macro is designed to be used with (:link 1 0 -11 2 |operator<<:) when throwing a boost::(:link 1 0 -7 2 :), to store information about the location of the throw statement. It can be chained with other (:link 1 0 -6 2 mod="p":) in a single throw expression. 0 -30 1 2 (:auto !!!:) (:include synopsis:) !!!!Precondition: ep shall not be null. !!!!Throws: The exception to which ep refers. 0 -40 3 2 (:auto !!!:) (:include decl:) !!!!Effects: Frees all resources associated with a boost::(:link 1 0 -7 2 :) object. !!!!Throws: Nothing. 0 -28 29 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: The (:link 1 0 -28 2 :) function must not be called outside of a catch block. !!!!Returns: * An (:link 1 0 -19 2 :) that refers to the currently handled exception or a copy of the currently handled exception. * If the function needs to allocate memory and the attempt fails, it returns an (:link 1 0 -19 2 :) that refers to an instance of std::bad_alloc. !!!!Throws: Nothing. !!!!Notes: * It is unspecified whether the return values of two successive calls to (:link 1 0 -28 2 :) refer to the same exception object. * Correct implementation of (:link 1 0 -28 2 :) may require compiler support, unless (:link 1 0 -20 2 :) was used at the time the currently handled exception object was passed to throw. If (:link 1 0 -20 2 :) was not used, and if the compiler does not provide the necessary support, then (:link 1 0 -28 2 :) may return an (:link 1 0 -19 2 :) that refers to an instance of (:link 1 0 -17 2 :). In this case, if the original exception object derives from boost::(:link 1 0 -7 2 :), then the boost::(:link 1 0 -7 2 :) sub-object of the (:link 1 0 -17 2 :) object is initialized by the boost::(:link 1 0 -7 2 :) copy constructor. 0 -31 5 2 (:auto !!!:) (:include synopsis:) !!!!Returns: Platform-specific diagnostic information about x. !!!!Notes: *If dynamic_cast<std::exception const *>(&x) is not null, the returned string includes the output from std::exception::what. *If dynamic_cast<boost::(:link 1 0 -7 2 :) const *>(&x) is not null, the returned string includes the output from boost::(:link 1 0 -16 2 :). 0 -33 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -32 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -34 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -35 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -36 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -37 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -38 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -39 0 0 -41 13 2 (:auto !!!:) The code snippet below demonstrates how boost::(:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html|tuple:) can be used to bundle the name of the function that failed, together with the reported errno so that they can be added to exception objects more conveniently together: [@#include <(:link 1 0 -13 2 :)> #include <boost/shared_ptr.hpp> #include <stdio.h> #include <string> #include <errno.h> typedef boost::(:link 1 0 -6 2 :)<struct tag_file_name,std::string> file_name_info; typedef boost::(:link 1 0 -6 2 :)<struct tag_function,char const *> function_info; typedef boost::(:link 1 0 -6 2 :)<struct tag_errno,int> errno_info; typedef boost::tuple<function_info,errno_info> clib_failure; class file_open_error: public boost::(:link 1 0 -7 2 :) { }; boost::shared_ptr<FILE> file_open( char const * name, char const * mode ) { if( FILE * f=fopen(name,mode) ) return boost::shared_ptr<FILE>(f,fclose); else throw file_open_error() << file_name_info(name) << clib_failure("fopen",errno); }@] Note that the members of a boost::(:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html|tuple:) are stored separately in exception objects; they can only be retrieved individually, using (:link 1 0 -25 2 :). 0 -42 37 2 (:auto !!!:) When you catch an exception, you can call (:link 1 0 -28 2 :) to get an (:link 1 0 -19 2 :) object: [@#include <(:link 1 0 -8 2 :)> #include <boost/thread.hpp> #include <boost/bind.hpp> void do_work(); //throws cloning-enabled boost::(:link 1 0 -7 2 :)s void worker_thread( boost::(:link 1 0 -19 2 :) & error ) { try { do_work(); error = boost::(:link 1 0 -19 2 :)(); } catch( ... ) { error = boost::(:link 1 0 -28 2 :)(); } }@] In the above example, note that (:link 1 0 -28 2 :) captures the original type of the exception object. The exception can be thrown again using the (:link 1 0 -30 2 :) function: [@// ...continued void work() { boost::(:link 1 0 -19 2 :) error; boost::(:link http://www.boost.org/doc/html/boost/thread.html|thread:) t( boost::(:link http://www.boost.org/libs/bind/bind.html|bind:)(worker_thread,boost::(:link http://www.boost.org/doc/html/ref.html|ref:)(error)) ); t.(:link http://www.boost.org/doc/html/boost/thread.html|join:)(); if( error ) boost::(:link 1 0 -30 2 :)(error); }@] Note that (:link 1 0 -28 2 :) could fail to copy the original exception object in the following cases: * if there is not enough memory, in which case the returned (:link 1 0 -19 2 :) points to an instance of std::bad_alloc, or * if (:link 1 0 -20 2 :) was not used in the throw-expression passed to the original throw statement and the current implementation does not have the necessary compiler-specific support to copy the exception automatically, in which case the returned (:link 1 0 -19 2 :) points to an instance of (:link 1 0 -17 2 :). Regardless, the use of (:link 1 0 -28 2 :) and (:link 1 0 -30 2 :) in the above examples is well-formed. throws 47 reno_layer 38 0 -5 0 0 -6 0 0 -7 0 0 -8 0 0 -9 0 0 -10 0 0 -11 1 2 !!!!Throws: std::bad_alloc, or any exception emitted by the T copy constructor. 0 -12 0 0 -13 0 0 -14 0 0 -15 1 2 !!!!Throws: std::bad_alloc, or any exception emitted by T1..TN copy constructor. 0 -16 0 0 -17 0 0 -18 0 0 -19 0 0 -20 0 0 -21 0 0 -22 0 0 -23 0 0 -29 0 0 -24 0 0 -25 0 0 -26 0 0 -27 0 0 -30 0 0 -40 0 0 -28 0 0 -31 0 0 -33 0 0 -32 0 0 -34 0 0 -35 0 0 -36 0 0 -37 0 0 -38 0 0 -39 0 0 -41 0 0 -42 0 synopsis 48 reno_layer 38 0 -5 0 0 -6 3 2 `#include <(:link 1 0 -37 2 :)> [@namespace boost { (:include def pre_indent="4":) }@] 0 -7 3 2 `#include <(:link 1 0 -35 2 :)> [@namespace boost { (:include def pre_indent="4":) }@] 0 -8 3 2 [@#include <(:link 1 0 -35 2 :)> namespace boost { (:include api pre_indent="4":) }@] 0 -9 0 0 -10 0 0 -11 3 2 `#include <(:link 1 0 -37 2 :)>\\ [@namespace boost { (:include decl pre_indent="4":) }@] 0 -12 0 0 -13 1 2 [@#include <boost/tuple/tuple.hpp> namespace boost { (:include api pre_indent="4":) }@] 0 -14 0 0 -15 5 2 `#include <(:link 1 0 -13 2 :)> [@namespace boost { (:include 1 0 -15 2 decl pre_indent="4":) }@] 0 -16 0 0 -17 3 2 `#include <(:link 1 0 -8 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -18 0 0 -19 3 2 `#include <(:link 1 0 -8 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -20 3 2 `#include < 1 0 -35 2 > [@namespace boost { (:include decl pre_indent="4":) }@] 0 -21 0 0 -22 0 0 -23 3 2 `#include <(:link 1 0 -38 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -29 3 2 `#include <(:link 1 0 -8 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -24 0 0 -25 3 2 `#include < 1 0 -36 2 > [@namespace boost { (:include decl pre_indent="4":) }@] 0 -26 3 2 `#include < 1 0 -35 2 > [@namespace boost { (:include decl pre_indent="4":) }@] 0 -27 3 2 `#include <(:link 1 0 -37 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -30 3 2 `#include <(:link 1 0 -8 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -40 0 0 -28 3 2 `#include <(:link 1 0 -8 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -31 3 2 `#include <(:link 1 0 -33 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -33 1 2 [@#include <exception> namespace boost { (:include api pre_indent="4":) }@] 0 -32 1 2 [@(:include api:)@] 0 -34 1 2 [@namespace boost { (:include api pre_indent="4":) }@] 0 -35 1 2 [@namespace boost { (:include api pre_indent="4":) }@] 0 -36 1 2 [@#include <boost/shared_ptr.hpp> namespace boost { (:include api pre_indent="4":) }@] 0 -37 3 2 [@#include <(:link 1 0 -35 2 :)> #include <boost/current_function.hpp> #include <boost/shared_ptr.hpp> namespace boost { (:include api pre_indent="4":) }@] 0 -38 3 2 [@#include <(:link 1 0 -35 2 :)> #include <exception> namespace boost { (:include api pre_indent="4":) }@] 0 -39 0 0 -41 0 0 -42 0 49 reno_context_map 38 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 -16 -17 -18 -19 -20 -21 -22 -23 -29 -24 -25 -26 -27 -30 -40 -28 -31 -33 -32 -34 -35 -36 -37 -38 -39 -41 -42 38 0 1 -21 0 1 -22 0 1 -5 0 1 -39 1 FED4CEA991FBBA8DF26B5652CE68C929C38BEE74DFD6C8E89E2A623BF0A61503 1244906377 2548 323 0 ../../../../boost/exception/diagnostic_information.hpp 0 0 -33 1 FC684D0DD5A9732B4130F2AB3DB6E0491D0F523E14B7FB738B2019EA2C7F8717 2229778754 631 319 0 ../../example/cloning_2.cpp 0 0 -42 2 214D17B425C1C447F952970DA6B1A778AD45CCA513405EB2DA6EBE87285A852A 1906283610 2414 457 6B355BB18EB534B5221822257C7A7F834692C7256E5D118F5443C7D905731578 1509743294 810 1598 0 ../../../../boost/exception/diagnostic_information.hpp 0 0 -31 1 D9B8E6AA12A4F33953B1A961FA590C5A3840234B6531CA8C04AC985AD5800835 2432554768 702 408 0 ../../example/enable_error_info.cpp 0 0 -18 1 3FB3FF960AB73CFA030B0B3BF9B9B0E4DF6534F39E22EFCD3FD44C240DC1A650 3103461725 1751 323 0 ../../../../boost/exception/get_error_info.hpp 0 0 -36 1 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