1 reno_project 2 reno_config ../..;../../../../boost .*\.(cpp|hpp|h)$ 3 reno_layer_map 7 default 4 reno_layer 39 0 5 reno_context 2 D1AA2FC554CD67A50917905B0E9CCA2EBC1A9BA97368757B36ADF8419756ECF1 85276724 4917 514 ED09F845070FF7D381BE5EFB6B55313FD09FBA16B64B69992410380EFA45519C 2051939590 78 433 0 ../../../../boost/exception_ptr.hpp 0 0 <string>exception_ptr</string> 1 2 (:include include:) (:auto also:) 0 6 reno_context 2 D1AA2FC554CD67A50917905B0E9CCA2EBC1A9BA97368757B36ADF8419756ECF1 85276724 4917 514 156B870761DB092CE4269C1173B479A344A1041BA2B883765AF19A72B371D776 3239976720 117 4794 0 ../../../../boost/exception_ptr.hpp 0 0 <string>rethrow_exception</string> 1 2 (:include include:) (:auto also:) 0 7 reno_context 1 9CC0F5ADB1C04555FD571DABD1D7D6775D8B11977ECC8320AD4451FC435E89A1 1325628148 3147 323 0 ../../../../boost/exception/exception.hpp 0 0 <string>boost/exception/exception.hpp</string> exception_exception_hpp 1 2 (:include include:) (:auto also:) 0 8 reno_context 1 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../../../../boost/exception_ptr.hpp 0 0 <string>copy_exception</string> 1 2 (:include include:) (:auto also:) 0 12 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 13 reno_context 1 CE411E21EE9878B55B5906D033A0FC52574FB59D8A8CECB75405E9B1C9D782DB 1173443713 308 302 0 ../../example/logging.cpp 0 0 <string>diagnostic information</string> tutorial_diagnostic_information 1 2 (:include include:) (:auto also:) 0 14 reno_context 0 1 <string>transporting of arbitrary data to the catch site</string> tutorial_transporting_data 1 2 (:include include:) (:auto also:) 0 15 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 16 reno_context 1 749C8E4B47A3FD6A90DD8418BF64C4556537CE6E17ACEB2317D9F81DBEBBB0B0 1688004766 6783 323 0 ../../../../boost/exception/info.hpp 0 0 <string>boost/exception/info.hpp</string> exception_error_info_hpp 1 2 (:include include:) (:auto also:) 0 17 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 18 reno_context 1 E312FADF4C02B7A6CB1BE1EC16F05A21C20CBA3282D4EAFC8EBE0BA151F24779 2820045995 5108 323 0 ../../../../boost/exception_ptr.hpp 0 0 <string>boost/exception_ptr.hpp</string> exception_cloning_hpp 1 2 (:include include:) (:auto also:) 0 19 reno_context 2 13F58566E4D9F20B49F3F30B28528AEE562CD709108ADC1AE19A2F01D86C62F4 1430141721 2967 503 09CB6839AC1E71887371FB8159C2BFCD273A397C54E07B25CEF2EEF2FA24286A 4111403263 1924 878 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 20 reno_context 2 35F026FF4EC46450D19A8F970D6E39B881DA6B0FC2E95774CCADC5E34C9D57F1 1990614462 6369 737 F839AFD37DC086BB1231B8E87D8EEBD28129649A06FC685AC7DF65595871AE30 2291609923 1204 243 0 ../../../../boost/exception/info.hpp 0 0 <string>error_info</string> 1 2 (:include include:) (:auto also:) 0 21 reno_context 2 35F026FF4EC46450D19A8F970D6E39B881DA6B0FC2E95774CCADC5E34C9D57F1 1990614462 6369 737 C5A5927411FB16BB27418CF87226A27D6EC66958BD46DC87F97E571CB492E49D 2066106304 261 1449 0 ../../../../boost/exception/info.hpp 0 0 <string>operator<</exception</string> 1 2 (:include include:) (:auto also:) 0 22 reno_context 2 F7633FDCF6615C0199645701EE6E7ACE5CBCD7A7CF6838573791E91ABB3C09F2 1668435395 1332 396 A1F443AF571973A12005D2F7D4AE09A32AAF686FEEAE272EC21512A65EB943E8 3879093659 1300 26 0 ../../../../boost/exception/info_tuple.hpp 0 0 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AD3F339F7126003907BCBDB3EF846FCACA895132E1100D202DA67D2B7846EE65 3032091776 60 369 0 ../../../../boost/exception/exception.hpp 0 0 <string>exception::~exception</string> exception_destructor 1 2 (:include include:) (:auto also:) 0 26 reno_context 1 187BFD2B78A0DD006717B5B06FFD465E2468F521C32A86FB793F7A68AB5417F3 4276724153 574 382 0 ../../example/error_info_1.cpp 0 0 <string>adding of arbitrary data at the point of the throw</string> adding_data_at_throw 0 0 27 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 0 28 reno_context 1 5373E336DC4892A41D31694BCA1146382FC3137819A04689CA1F9FFAF1CFAB3B 4050491732 466 307 0 ../../example/cloning_1.cpp 0 0 <string>using enable_current_exception at the time of the throw</string> using_enable_cloning 0 0 29 reno_context 1 429F0DE3599A4CC08B9458E2AECA2EAC202AB3471554FE82C307493805E6676E 4224422781 401 323 0 ../../../../boost/exception.hpp 0 0 <string>boost/exception.hpp</string> exception_hpp 1 2 (:include include:) (:auto also:) 0 30 reno_context 1 ECAD4A1E70A31D7F87F79F557D107AB0A3C5161CB370139974E08ECAFBE2D32F 1816954312 457 323 0 ../../../../boost/exception/diagnostic_information.hpp 0 0 <string>boost/exception/diagnostic_information.hpp</string> 1 2 (:include include:) (:auto also:) 0 31 reno_context 1 0C00BEB179039380247D771B12C728884E9A3E5B483AC63CD5789852C7A5CC35 2506662970 2467 323 0 ../../../../boost/exception/enable_error_info.hpp 0 0 <string>boost/exception/enable_error_info.hpp</string> exception_enable_error_info_hpp 1 2 (:include include:) (:auto also:) 0 32 reno_context 1 CAB4D823BD4720B71E1CA5BE482AC95B42A9E07CD5E08671EA23184635F281A2 3077708282 89 323 0 ../../../../boost/exception/error_info.hpp 0 0 <string>boost/exception/error_info.hpp</string> exception_error_info_value_hpp 1 2 (:include include:) (:auto also:) 0 33 reno_context 1 CAD6C404CB725D336A44920D2341ECA131149AB02C368B59028F8147F16737BF 2258638601 94 227 0 ../../../../boost/exception/info_tuple.hpp 0 0 <string>boost/exception/info_tuple.hpp</string> exception_error_info_group_hpp 1 2 (:include include:) (:auto also:) 0 34 reno_context 1 07959353ADCC10CF96D16F87F2D01195D75C3A6A2A797513ED3DDFA2F80E2E09 303643772 1838 91 0 ../../../../boost/throw_exception.hpp 0 0 <string>boost/throw_exception.hpp</string> throw_exception_hpp 1 2 (:include include:) (:auto also:) 0 35 reno_context 3 13F58566E4D9F20B49F3F30B28528AEE562CD709108ADC1AE19A2F01D86C62F4 1430141721 2967 503 09CB6839AC1E71887371FB8159C2BFCD273A397C54E07B25CEF2EEF2FA24286A 4111403263 1924 878 BAC52AC87CFA3174B3352140A8DC10BB7F48C945FC87787C3AC96F0FC2CFDB40 1066412964 165 57 0 ../../../../boost/exception/exception.hpp 0 0 <string>exception::diagnostic_information</string> 1 2 (:include include:) (:auto also:) 0 36 reno_context 3 13F58566E4D9F20B49F3F30B28528AEE562CD709108ADC1AE19A2F01D86C62F4 1430141721 2967 503 09CB6839AC1E71887371FB8159C2BFCD273A397C54E07B25CEF2EEF2FA24286A 4111403263 1924 878 BACD79DFB4C710C1A67687FC6344DF2251E2379613C2DF5B2729B2CD37E24EA3 458367129 154 246 0 ../../../../boost/exception/exception.hpp 0 0 <string>exception::exception</string> exception_constructors 1 2 (:include include:) (:auto also:) 0 37 reno_context 2 D1AA2FC554CD67A50917905B0E9CCA2EBC1A9BA97368757B36ADF8419756ECF1 85276724 4917 514 A098B6FA5BC8E72E0E69C0323195FCC142AE807564C6892FCBD88588F2FBE049 2579522516 405 26 0 ../../../../boost/exception_ptr.hpp 0 0 <string>unknown_exception</string> 1 2 (:include include:) (:auto also:) 0 38 reno_context 2 FA5027D9799B8059059C23397F469D6EF6328DC23E92E0BE0FF5BE019A576174 1806359597 3234 506 DF9EA87B0140AACF4422F1B76F6A6A409C15F32858BBBA85A35981A824C56BA9 1137981799 192 3036 0 ../../../../boost/exception/enable_current_exception.hpp 0 0 <string>enable_current_exception</string> 1 2 (:include include:) (:auto also:) 0 39 reno_context 0 1 <string>Index</string> name_idx 1 2 (:auto !:) (:pagelist fmt="index" except_tags="index,noindex" mod="w":) 0 40 reno_context 2 7ACC4E316D4EDB3EC7AEC35FED3ADB47DDF75D575028D7BCD11C5233E4F4A277 4268848542 2333 457 61DE70107961C0B9A65674017F91FF85190CF84B4F3B0CA7AC04A7E16DE80B37 3187961206 2301 26 0 ../../../../boost/exception/enable_error_info.hpp 0 0 <string>enable_error_info</string> 1 2 (:include include:) (:auto also:) 0 41 reno_context 0 1 <string>transporting of exceptions between threads</string> tutorial_exception_ptr 1 2 (:include include:) (:auto also:) 0 42 reno_context 0 1 <string>boost exception</string> boost-exception 113 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 -41 2 |copying:) of exception objects, implemented non-intrusively and automatically by the boost::(:link 1 0 43 reno_context 2 612485E090D76B2CC43C1A296F813075BA165C2496082E78E939F10B3DA8E09A 1770110914 587 1322 60F3F48B87487FA6E0D2CCC0750AF435CC92CEC80BBBF609AC71295031AADD0D 3929437933 361 213 0 ../../../../boost/throw_exception.hpp 0 0 <string>throw_exception</string> 2 :) function. !!Contents #Tutorial ##(:link 1 0 -14 2 mod="w":) ##(:link 1 0 -15 2 mod="w":) ##(:link 1 0 -41 2 mod="w":) ##(:link 1 0 -13 2 mod="w":) #Documentation ##Class (:link 1 0 -19 2 :) ##Transporting of Arbitrary Data to the Catch Site ###(:link 1 0 -20 2 :) ###(:link 1 0 -21 2 :) ###(:link 1 0 -22 2 :) ###(:link 1 0 -9 2 :) ###(:link 1 0 -40 2 :) ###(:link 1 0 -8 2 :) ##(:link http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html|N2179:) Transporting of Exceptions between Threads ###(:link 1 0 -5 2 :) ###(:link 1 0 -38 2 :) ###(:link 1 0 -23 2 :) ###(:link 1 0 -11 2 :) ###(:link 1 0 -6 2 :) ###(:link 1 0 -37 2 :) ##(:link 1 0 -24 2 :) ##(:link 1 0 -43 2 :) ##Headers ###(:link 1 0 -29 2 :) ###(:link 1 0 -30 2 :) ###(:link 1 0 -10 2 :) ###(:link 1 0 -31 2 :) ###(:link 1 0 -32 2 :) ###(:link 1 0 -7 2 :) ###(:link 1 0 -16 2 :) ###(:link 1 0 -33 2 :) ###(:link 1 0 -18 2 :) ###(:link 1 0 -34 2 :) #(:link 1 0 -39 2 :) !!Synopsis `#include <(:link 1 0 -29 2 :)> [@namespace boost { (:include 1 0 -7 2 api pre_indent="4":) (:include 1 0 -16 2 api pre_indent="4":) (:include 1 0 -33 2 api pre_indent="4":) (:include 1 0 -31 2 api pre_indent="4":) (:include 1 0 -30 2 api pre_indent="4":) (:include 1 0 -18 2 api pre_indent="4":) (:include 1 0 -10 2 api pre_indent="4":) (:include 1 0 -34 2 api pre_indent="4":) }@] !!Class exception (:include 1 0 -19 2 :) !!Transporting of Arbitrary Data to the Catch Site (:include 1 0 -20 2 :) (:include 1 0 -21 2 :) (:include 1 0 -22 2 :) (:include 1 0 -9 2 :) (:include 1 0 -40 2 :) (:include 1 0 -8 2 :) !!Transporting of Exceptions between Threads (:include 1 0 -5 2 :) (:include 1 0 -38 2 :) (:include 1 0 -23 2 :) (:include 1 0 -11 2 :) (:include 1 0 -6 2 :) (:include 1 0 -37 2 :) !!Printing Diagnostic Information (:include 1 0 -24 2 :) !!Throwing Exceptions (:include 1 0 -43 2 :) 0 -43 1 2 (:include include:) (:auto also:) def 44 reno_layer 39 0 -5 0 0 -6 0 0 -7 0 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 9 2 [@class (:link 1 0 -19 2 :) { public: (:include 1 0 -35 2 decl pre_indent="4":) protected: (:include 1 0 -36 2 decl pre_indent="4":) (:include 1 0 -25 2 decl pre_indent="4":) };@] 0 -20 3 2 [@template <class Tag,class T> class (:link 1 0 -20 2 :) { public: typedef T value_type; error_info( value_type const & ); };@] 0 -21 0 0 -22 0 0 -23 0 0 -24 0 0 -25 0 0 -26 0 0 -27 0 0 -28 0 0 -29 0 0 -30 0 0 -31 0 0 -32 0 0 -33 0 0 -34 0 0 -35 0 0 -36 0 0 -37 0 0 -38 0 0 -39 0 0 -40 0 0 -41 0 0 -42 0 0 -43 0 api 45 reno_layer 39 0 -5 0 0 -6 0 0 -7 3 2 [@(:include 1 0 -19 2 def:)@] 0 -8 0 0 -9 0 0 -10 3 2 [@(:include 1 0 -38 2 decl:)@] 0 -11 0 0 -12 0 0 -13 0 0 -14 0 0 -15 0 0 -16 9 2 [@(:include 1 0 -20 2 def:) (:include 1 0 -9 2 decl:) (:include 1 0 -8 2 decl:) (:include 1 0 -21 2 decl:)@] 0 -17 0 0 -18 11 2 [@(:include 1 0 -37 2 decl:) (:include 1 0 -5 2 decl:) (:include 1 0 -11 2 decl:) (:include 1 0 -23 2 decl:) (:include 1 0 -6 2 decl:)@] 0 -19 0 0 -20 0 0 -21 0 0 -22 0 0 -23 0 0 -24 0 0 -25 0 0 -26 0 0 -27 0 0 -28 0 0 -29 11 2 [@#include <(:link 1 0 -16 2 :)> #include <(:link 1 0 -33 2 :)> #include <(:link 1 0 -30 2 :)> #include <(:link 1 0 -18 2 :)> #include <(:link 1 0 -34 2 :)>@] 0 -30 3 2 [@(:include 1 0 -24 2 decl:)@] 0 -31 3 2 [@(:include 1 0 -40 2 decl:)@] 0 -32 3 2 [@(:include 1 0 -20 2 decl:)@] 0 -33 3 2 [@(:include 1 0 -22 2 decl:)@] 0 -34 3 2 [@(:include 1 0 -43 2 decl:)@] 0 -35 0 0 -36 0 0 -37 0 0 -38 0 0 -39 0 0 -40 0 0 -41 0 0 -42 0 0 -43 0 decl 46 reno_layer 39 0 -5 3 2 [@typedef ---unspecified--- (:link 1 0 -5 2 :);@] 0 -6 5 2 [@void (:link 1 0 -6 2 :)( (:link 1 0 -5 2 :) const & ep ); 0 -7 0 0 -8 9 2 [@typedef (:link 1 0 -20 2 :)<struct tag_throw_function,char const *> throw_function; typedef (:link 1 0 -20 2 :)<struct tag_throw_file,char const *> throw_file; typedef (:link 1 0 -20 2 :)<struct tag_throw_line,int> throw_line; #define (:link 1 0 -8 2 :)\ ::boost::throw_function(BOOST_CURRENT_FUNCTION) <<\ ::boost::throw_file(__FILE__) <<\ ::boost::throw_line((int)__LINE__)@] 0 -9 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 -9 2 :)( E const & x );@] 0 -10 0 0 -11 5 2 [@template <class T> (:link 1 0 -5 2 :) (:link 1 0 -11 2 :)( T const & e );@] 0 -12 0 0 -13 0 0 -14 0 0 -15 0 0 -16 0 0 -17 0 0 -18 0 0 -19 3 2 [@class 1 0 -19 2 ;@] 0 -20 3 2 [@template <class Tag,class T> class (:link 1 0 -20 2 :);@] 0 -21 5 2 [@template <class E, class Tag, class T> E const & (:link 1 0 -21 2 |operator<<:)( E const & x, (:link 1 0 -20 2 :)<Tag,T> const & v );@] 0 -22 7 2 [@template <class E, class Tag1, class T1, ..., class TagN, class TN> E const & (:link 1 0 -22 2 |operator<<:)( E const & x, (:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html|tuple:)< (:link 1 0 -20 2 :)<Tag1,T1>, ..., (:link 1 0 -20 2 :)<TagN,TN> > const & v );@] 0 -23 5 2 [@(:link 1 0 -5 2 :) (:link 1 0 -23 2 :)();@] 0 -24 3 2 [@std::string 1 0 -24 2 ( std::exception const & x );@] 0 -25 3 2 [@(:link 1 0 -25 2 mod="m":)();@] 0 -26 0 0 -27 0 0 -28 0 0 -29 0 0 -30 0 0 -31 0 0 -32 0 0 -33 0 0 -34 0 0 -35 3 2 [@virtual char const * (:link 1 0 -35 2 mod="m":)() const throw();@] 0 -36 7 2 [@(:link 1 0 -36 2 mod="m":)(); (:link 1 0 -36 2 mod="m":)( (:link 1 0 -19 2 :) const & x );@] 0 -37 5 2 [@class (:link 1 0 -37 2 :): public std::exception public boost:: 1 0 -19 2 { ---unspecified--- };@] 0 -38 3 2 [@template <class T> ---unspecified--- (:link 1 0 -38 2 :)( T const & e );@] 0 -39 0 0 -40 3 2 [@template <class T> ---unspecified--- (:link 1 0 -40 2 :)( T const & x );@] 0 -41 0 0 -42 0 0 -43 5 2 [@#ifdef BOOST_NO_EXCEPTIONS void (:link 1 0 -43 2 :)( std::exception const & e ); // user defined #else template <class E> void (:link 1 0 -43 2 :)( E const & e ); #endif@] include 47 reno_layer 39 0 -5 9 2 (:auto !!!:) (:include synopsis:) The (:link 1 0 -5 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 -5 2 :)'s operations do not throw. Two instances of (:link 1 0 -5 2 :) are equivalent and compare equal if and only if they refer to the same exception. The default constructor of (:link 1 0 -5 2 :) produces the null value of the type. The null value is equivalent only to itself. 0 -6 1 2 (:auto !!!:) (:include synopsis:) !!!!Precondition: ep shall not be null. !!!!Throws: The exception to which ep refers. 0 -7 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -8 7 2 (:auto !!!:) (:include synopsis:) This macro is designed to be used with (:link 1 0 -21 2 |operator<<:) when throwing a boost::(:link 1 0 -19 2 :), to store information about the location of the throw statement. It can be chained with other (:link 1 0 -20 2 mod="p":) in a single throw expression. 0 -9 7 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: * ErrorInfo must be an instance of the (:link 1 0 -20 2 :) template. * E must be polymorphic. !!!!Returns: * If dynamic_cast<boost::(:link 1 0 -19 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 -21 2 |operator<<:) to store values in exception objects.) The shared_ptr is valid even after x has been destroyed. !!!!Throws: Nothing. 0 -10 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -11 3 2 (:auto !!!:) (:include synopsis:) !!!!Effects: As if try { throw e; } catch( ... ) { return (:link 1 0 -23 2 :)(); } 0 -12 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 -19 2 :), and free the file_read function from the burden of storing the file name in exceptions it throws: [@#include <(:link 1 0 -29 2 :)> #include <stdio.h> #include <errno.h> typedef boost::(:link 1 0 -20 2 :)<struct tag_errno,int> errno_info; class file_read_error: public boost::(:link 1 0 -19 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 -29 2 :)> #include <boost/shared_ptr.hpp> #include <stdio.h> #include <string> typedef boost::(:link 1 0 -20 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 -19 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 -19 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 -19 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 -9 2 :). 0 -13 21 2 (:auto !!:) Class boost::(:link 1 0 -19 2 :) provides a virtual member function (:link 1 0 -35 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 -29 2 :)> #include <iostream> void f(); //throws unknown types that derive from boost::(:link 1 0 -19 2 :). void g() { try { f(); } catch( boost::(:link 1 0 -19 2 :) & e ) { std::cerr << e.(:link 1 0 -35 2 mod="m":)(); } }@] The (:link 1 0 -35 2 mod="m":) member function iterates over all data objects stored in the boost::(:link 1 0 -19 2 :) through (:link 1 0 -21 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 -20 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 -14 11 2 (:auto !!:) All exception types that derive from boost::(:link 1 0 -19 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 -19 2 :) at the time of the throw, or at a later time. (:include 1 0 -26 2 :) (:include 1 0 -12 2 :) (:include 1 0 -17 2 :) 0 -15 27 2 (:auto !!:) Some exception hierarchies can not be modified to make boost::(:link 1 0 -19 2 :) a base type. In this case, the (:link 1 0 -40 2 :) function template can be used to make exception objects derive from boost::(:link 1 0 -19 2 :) anyway. Here is an example: [@#include <(:link 1 0 -29 2 :)> #include <stdexcept> typedef boost::(:link 1 0 -20 2 :)<struct tag_std_range_min,size_t> std_range_min; typedef boost::(:link 1 0 -20 2 :)<struct tag_std_range_max,size_t> std_range_max; typedef boost::(:link 1 0 -20 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 -40 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 -40 2 :)<T> gets us an object of ''unspecified type'' which is guaranteed to derive from both boost::(:link 1 0 -19 2 :) and T. This makes it possible to use (:link 1 0 -21 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 -19 2 :) &, so that (:link 1 0 -14 2 |more information can be added to the exception at a later time:). 0 -16 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -17 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 -33 2 :)> #include <boost/shared_ptr.hpp> #include <stdio.h> #include <string> #include <errno.h> typedef boost::(:link 1 0 -20 2 :)<struct tag_file_name,std::string> file_name_info; typedef boost::(:link 1 0 -20 2 :)<struct tag_function,char const *> function_info; typedef boost::(:link 1 0 -20 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 -19 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 -9 2 :). 0 -18 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -19 19 2 (:auto !!!:) (:include synopsis:) Class boost::(:link 1 0 -19 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 -19 2 :) can store data of arbitrary types, using the (:link 1 0 -20 2 :) wrapper and (:link 1 0 -21 2 |operator<<:). To retrieve data from a boost::(:link 1 0 -19 2 :) object, use the (:link 1 0 -9 2 :) function template. (:include 1 0 -36 2 :) (:include 1 0 -25 2 :) (:include 1 0 -35 2 :) 0 -20 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 -20 2 :)<Tag,T> can be passed to (:link 1 0 -21 2 |operator<<:) to be stored in objects of type boost::(:link 1 0 -19 2 :). !!!!Note: The header <(:link 1 0 -32 2 :)> provides a declaration of the (:link 1 0 -20 2 :) template, which is sufficient for the purpose of typedefing an instance for specific Tag and T, like this: [@#include <(:link 1 0 -32 2 :)> typedef boost::(:link 1 0 -20 2 :)<struct tag_errno,int> errno_info;@] Of course, to actually add an (:link 1 0 -20 2 :) object to (:link 1 0 -19 2 mod="p":) using (:link 1 0 -21 2 |operator<<:), or to retrieve it using (:link 1 0 -9 2 :), you must first #include <(:link 1 0 -16 2 :)>. 0 -21 7 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: E must be boost::(:link 1 0 -19 2 :), or a type that derives (indirectly) from boost::(:link 1 0 -19 2 :). !!!!Effects: Stores a copy of v into x. If x already contains data of type (:link 1 0 -20 2 :)<Tag,T>, that data is overwritten. !!!!Returns: x. (:include throws:) 0 -22 5 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: E must be boost::(:link 1 0 -19 2 :), or a type that derives (indirectly) from boost::(:link 1 0 -19 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 -23 29 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: The (:link 1 0 -23 2 :) function must not be called outside of a catch block. !!!!Returns: * An (:link 1 0 -5 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 -5 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 -23 2 :) refer to the same exception object. * Correct implementation of (:link 1 0 -23 2 :) may require compiler support, unless (:link 1 0 -38 2 :) was used at the time the currently handled exception object was passed to throw. If (:link 1 0 -38 2 :) was not used, and if the compiler does not provide the necessary support, then (:link 1 0 -23 2 :) may return an (:link 1 0 -5 2 :) that refers to an instance of (:link 1 0 -37 2 :). In this case, if the original exception object derives from boost::(:link 1 0 -19 2 :), then the boost::(:link 1 0 -19 2 :) sub-object of the (:link 1 0 -37 2 :) object is initialized by the boost::(:link 1 0 -19 2 :) copy constructor. 0 -24 5 2 (:auto !!!:) (:include synopsis:) !!!!Returns: If dynamic_cast<boost::(:link 1 0 -19 2 :) const *>(&x) is not null, the returned string is initialized by a call to (:link 1 0 -35 2 :); otherwise, the returned string combines the output of x.what() and typeid(x).name(). 0 -25 3 2 (:auto !!!:) (:include decl:) !!!!Effects: Frees all resources associated with a boost::(:link 1 0 -19 2 :) object. !!!!Throws: Nothing. 0 -26 17 2 (:auto !!!:) The following example demonstrates how errno can be stored in exception objects using Boost Exception: [@#include <(:link 1 0 -29 2 :)> #include <errno.h> #include <iostream> typedef boost::(:link 1 0 -20 2 :)<struct tag_errno,int> errno_info; //(1) class my_error: public boost::(:link 1 0 -19 2 :), public std::exception { }; //(2) void f() { throw my_error() << errno_info(errno); //(3) } @] First, we instantiate the (:link 1 0 -20 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 -19 2 :). Finally, (3) illustrates how the typedef from (1) can be used with (:link 1 0 -21 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 -9 2 :)<errno_info>(x) ) std::cerr << "Error code: " << *err; } }@] The (:link 1 0 -9 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 -27 37 2 (:auto !!!:) When you catch an exception, you can call (:link 1 0 -23 2 :) to get an (:link 1 0 -5 2 :) object: [@#include <(:link 1 0 -18 2 :)> #include <boost/thread.hpp> #include <boost/bind.hpp> void do_work(); //throws cloning-enabled boost::(:link 1 0 -19 2 :)s void worker_thread( boost::(:link 1 0 -5 2 :) & error ) { try { do_work(); error = boost::(:link 1 0 -5 2 :)(); } catch( ... ) { error = boost::(:link 1 0 -23 2 :)(); } }@] In the above example, note that (:link 1 0 -23 2 :) captures the original type of the exception object. The exception can be thrown again using the (:link 1 0 -6 2 :) function: [@// ...continued void work() { boost::(:link 1 0 -5 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 -6 2 :)(error); }@] Note that (:link 1 0 -23 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 -5 2 :) points to an instance of std::bad_alloc, or * if (:link 1 0 -38 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 -5 2 :) points to an instance of (:link 1 0 -37 2 :). Regardless, the use of (:link 1 0 -23 2 :) and (:link 1 0 -6 2 :) in the above examples is well-formed. 0 -28 13 2 (:auto !!!:) Here is how cloning can be enabled in a throw-expression (15.1): [@#include <(:link 1 0 -10 2 :)> #include <(:link 1 0 -16 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 -19 2 :) { }; void file_read( FILE * f, void * buffer, size_t size ) { if( size!=fread(buffer,1,size,f) ) throw boost::(:link 1 0 -38 2 :)(file_read_error()) << errno_info(errno); }@] Of course, (:link 1 0 -38 2 :) may be used with any exception type; there is no requirement that it should derive from boost::(:link 1 0 -19 2 :). 0 -29 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -30 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -31 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -32 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -33 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -34 1 2 (:auto !!:) !!!Synopsis (:include synopsis:) 0 -35 15 2 (:auto !!!:) (:include decl:) !!!!Returns: A string representation of all data stored in the boost::(:link 1 0 -19 2 :) object by the (:link 1 0 -21 2 |operator<<:) function. See "(:link 1 0 -13 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 1 0 -30 2 provides a namespace-scope function 1 0 -24 2 which takes a std::exception. It calls 1 0 -35 2 if its argument can be converted to boost:: 1 0 -19 2 ; otherwise it returns a string that combines the value of std::exception::what and the exception's dynamic type. 0 -36 7 2 (:auto !!!:) (:include decl:) !!!!Effects: * Default constructor: initializes an empty boost::(:link 1 0 -19 2 :) object. * Copy constructor: initializes a boost::(:link 1 0 -19 2 :) object which shares with x all data added through (:link 1 0 -21 2 |operator<<:), including data that is added at a future time. !!!!Throws: Nothing. 0 -37 5 2 (:auto !!!:) (:include synopsis:) This type is used by the (:link 1 0 -5 2 :) support in Boost Exception. Please see (:link 1 0 -23 2 :). 0 -38 21 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: T must have 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 1 0 -5 2 support in Boost Exception. For example: [@class my_exception: public std::exception { }; .... throw boost::(:link 1 0 -38 2 :)(my_exception());@] Unless (:link 1 0 -38 2 :) is called at the time an exception object is used in a throw-expression, an attempt to copy it using (:link 1 0 -23 2 :) may return an (:link 1 0 -5 2 :) which refers to an instance of (:link 1 0 -37 2 :). See (:link 1 0 -23 2 :) for details. !!!!Note: Instead of using the throw keyword directly, it is preferable to call boost::(:link 1 0 -43 2 :). This is guaranteed to throw an exception that derives from boost::(:link 1 0 -19 2 :) and supports the 1 0 -5 2 functionality. 0 -39 0 0 -40 5 2 (:auto !!!:) (:include synopsis:) !!!!Requirements: T must be a user-defined type with accessible no-throw copy constructor as per (15.5.1). !!!!Returns: * If T derives from boost:: 1 0 -19 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:: 1 0 -19 2 . The T sub-object is initialized from x by the T copy constructor. !!!!Throws: Nothing. 0 -41 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 -38 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 -43 2 :) are guaranteed to derive from boost::(:link 1 0 -19 2 :) and to support cloning. (:include 1 0 -28 2 :) (:include 1 0 -27 2 :) 0 -42 0 0 -43 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 -43 2 :)(e) is equivalent to throw boost::(:link 1 0 -38 2 :)(boost::(:link 1 0 -40 2 :)(e)), unless BOOST_EXCEPTION_DISABLE is defined, in which case boost::(:link 1 0 -43 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 -43 2 are allowed to assume that the function never returns; therefore, if the user-defined 1 0 -43 2 returns, the behavior is undefined. throws 48 reno_layer 39 0 -5 0 0 -6 0 0 -7 0 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 1 2 !!!!Throws: std::bad_alloc, or any exception emitted by the T copy constructor. 0 -22 1 2 !!!!Throws: std::bad_alloc, or any exception emitted by T1..TN copy constructor. 0 -23 0 0 -24 0 0 -25 0 0 -26 0 0 -27 0 0 -28 0 0 -29 0 0 -30 0 0 -31 0 0 -32 0 0 -33 0 0 -34 0 0 -35 0 0 -36 0 0 -37 0 0 -38 0 0 -39 0 0 -40 0 0 -41 0 0 -42 0 0 -43 0 synopsis 49 reno_layer 39 0 -5 3 2 `#include <(:link 1 0 -18 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -6 3 2 `#include <(:link 1 0 -18 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -7 1 2 [@namespace boost { (:include api pre_indent="4":) }@] 0 -8 3 2 `#include <(:link 1 0 -16 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -9 3 2 `#include <(:link 1 0 -16 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -10 3 2 [@#include <(:link 1 0 -7 2 :)> namespace boost { (:include api pre_indent="4":) }@] 0 -11 3 2 `#include <(:link 1 0 -18 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -12 0 0 -13 0 0 -14 0 0 -15 0 0 -16 3 2 [@#include <(:link 1 0 -7 2 :)> #include <boost/current_function.hpp> #include <boost/shared_ptr.hpp> namespace boost { (:include api pre_indent="4":) }@] 0 -17 0 0 -18 3 2 [@#include <(:link 1 0 -7 2 :)> namespace boost { (:include api pre_indent="4":) }@] 0 -19 3 2 `#include <(:link 1 0 -7 2 :)> [@namespace boost { (:include def pre_indent="4":) }@] 0 -20 3 2 `#include <(:link 1 0 -16 2 :)> [@namespace boost { (:include def pre_indent="4":) }@] 0 -21 3 2 `#include <(:link 1 0 -16 2 :)>\\ [@namespace boost { (:include decl pre_indent="4":) }@] 0 -22 5 2 `#include <(:link 1 0 -33 2 :)> [@namespace boost { (:include 1 0 -22 2 decl pre_indent="4":) }@] 0 -23 3 2 `#include <(:link 1 0 -18 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -24 3 2 `#include <(:link 1 0 -30 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -25 0 0 -26 0 0 -27 0 0 -28 0 0 -29 1 2 [@(:include api:)@] 0 -30 1 2 [@#include <exception> namespace boost { (:include api pre_indent="4":) }@] 0 -31 3 2 [@#include <(:link 1 0 -7 2 :)> namespace boost { (:include api pre_indent="4":) }@] 0 -32 1 2 [@namespace boost { (:include api pre_indent="4":) }@] 0 -33 1 2 [@#include <boost/tuple/tuple.hpp> namespace boost { (:include api pre_indent="4":) }@] 0 -34 5 2 [@#include <(:link 1 0 -10 2 :)> #include <(:link 1 0 -31 2 :)> #include <exception> namespace boost { (:include api pre_indent="4":) }@] 0 -35 0 0 -36 0 0 -37 3 2 `#include <(:link 1 0 -18 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -38 3 2 `#include <(:link 1 0 -10 2 :)> [@namespace boost { (:include decl pre_indent="4":) }@] 0 -39 0 0 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