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(:link + 1 + + 0 + + -54 + + + 2 + :)<struct throw_file_,char const *> throw_file; typedef (:link + 1 + + 0 + + -54 + + + 2 + :)<struct throw_line_,int> throw_line;@] + + + + 0 + + -51 + + + 0 + + + + 0 + + -52 + + + 0 + + + + 0 + + -53 + + + 0 + + + + 0 + + -54 + + + 0 + + + + 0 + + -55 + + + 0 + + + + 0 + + -56 + + + 3 + 2 + [@(:include + 1 + + 0 + + -14 + + + 2 + def:)@] + + + + 0 + + -57 + + + 0 + + + + 0 + + -58 + + + 0 + + + + 0 + + -59 + + + 3 + 2 + [@(:include + 1 + + 0 + + -5 + + + 2 + def:)@] + + + + 0 + + -60 + + + 3 + 2 + [@(:include + 1 + + 0 + + -68 + + + 2 + decl:)@] + + + + 0 + + -61 + + + 0 + + + + 0 + + -62 + + + 0 + + + + 0 + + -63 + + + 0 + + + + 0 + + -64 + + + 7 + 2 + [@(:include + 1 + + 0 + + -13 + + + 2 + decl:) (:include + 1 + + 0 + + -38 + + + 2 + decl:) (:include + 1 + + 0 + + -47 + + + 2 + decl:)@] + + + + 0 + + -65 + + + 0 + + + + 0 + + -66 + + + 3 + 2 + [@(:include + 1 + + 0 + + -48 + + + 2 + def:)@] + + + + 0 + + -67 + + + 0 + + + + 0 + + -68 + + + 0 + + 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-13 + + + 2 + :)( (:link + 1 + + 0 + + -69 + + + 2 + :) const & p, bool verbose=true );@] + + + + 0 + + -14 + + + 0 + + + + 0 + + -15 + + + 0 + + + + 0 + + -16 + + + 0 + + + + 0 + + -17 + + + 0 + + + + 0 + + -18 + + + 0 + + + + 0 + + -19 + + + 5 + 2 + [@template <class E, class Tag, class T> E const & (:link + 1 + + 0 + + -19 + + + 2 + mod="/":)( E const & x, (:link + 1 + + 0 + + -54 + + + 2 + :)<Tag,T> const & v );@] + + + + 0 + + -20 + + + 7 + 2 + [@(:link + 1 + + 0 + + -20 + + + 2 + mod="m":)(); (:link + 1 + + 0 + + -20 + + + 2 + mod="m":)( (:link + 1 + + 0 + + -53 + + + 2 + :) const & x );@] + + + + 0 + + -21 + + + 0 + + + + 0 + + -22 + + + 0 + + + + 0 + + -23 + + + 5 + 2 + [@void (:link + 1 + + 0 + + -23 + + + 2 + :)( (:link + 1 + + 0 + + -69 + + + 2 + :) const & ep ); + + + + 0 + + -24 + + + 0 + + + + 0 + + -25 + + + 0 + + + + 0 + + -26 + + + 0 + + + + 0 + + -27 + + + 7 + 2 + [@template <class E, class Tag1, class T1, ..., class TagN, class TN> E const & (:link + 1 + + 0 + + -27 + + + 2 + mod="/":)( E const & x, (:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html|tuple:)< (:link + 1 + + 0 + + -54 + + + 2 + :)<Tag1,T1>, ..., (:link + 1 + + 0 + + -54 + + + 2 + :)<TagN,TN> > const & v );@] + + + + 0 + + -28 + + + 0 + + + + 0 + + -29 + + + 5 + 2 + [@typedef (:link + 1 + + 0 + + -54 + + + 2 + :)<struct tag_original_exception_type,std::type_info const *> + 1 + + 0 + + -29 + + + 2 + ;@] + + + + 0 + + -30 + + + 0 + + + + 0 + + -31 + + + 0 + + + + 0 + + -32 + + + 3 + 2 + [@template <class T> ---unspecified--- (:link + 1 + + 0 + + -32 + + + 2 + :)( T const & e );@] + + + + 0 + + -33 + + + 21 + 2 + [@#if !defined( BOOST_EXCEPTION_DISABLE ) #include <(:link + 1 + + 0 + + -50 + + + 2 + :)> #include <boost/current_function.hpp> #define (:link + 1 + + 0 + + -33 + + + 2 + :)(x)\ ::boost::(:link + 1 + + 0 + + -67 + + + 2 + :)( ::boost::(:link + 1 + + 0 + + -63 + + + 2 + :)(x) <<\ ::boost::(:link + 1 + + 0 + + -50 + + + 2 + |throw_function:)((:link + 1 + + 0 + + -22 + + + 2 + |BOOST_THROW_EXCEPTION_CURRENT_FUNCTION:)) <<\ ::boost::(:link + 1 + + 0 + + -50 + + + 2 + |throw_file:)(__FILE__) <<\ ::boost::(:link + 1 + + 0 + + -50 + + + 2 + |throw_line:)((int)__LINE__) ) #else #define (:link + 1 + + 0 + + -33 + + + 2 + :)(x) ::boost::(:link + 1 + + 0 + + -67 + + + 2 + :)(x) #endif@] + + + + 0 + + -34 + + + 3 + 2 + [@(:link + 1 + + 0 + + -34 + + + 2 + mod="m":)();@] + + + + 0 + + -35 + + + 0 + + + + 0 + + -36 + + + 0 + + + + 0 + + -37 + + + 0 + + + + 0 + + -38 + + + 5 + 2 + [@char const * (:link + 1 + + 0 + + -38 + + + 2 + :)( boost::(:link + 1 + + 0 + + -53 + + + 2 + :) const & e, bool verbose=true ) throw();@] + + + + 0 + + -39 + + + 0 + + + + 0 + + -40 + + + 0 + + + + 0 + + -41 + + + 0 + + + + 0 + + -42 + + + 0 + + + + 0 + + -43 + + + 0 + + + + 0 + + -44 + + + 0 + + + + 0 + + -45 + + + 0 + + + + 0 + + -46 + + + 0 + + + + 0 + + -47 + + + 3 + 2 + [@std::string (:link + 1 + + 0 + + -47 + + + 2 + :)();@] + + + + 0 + + -48 + + + 0 + + + + 0 + + -49 + + + 0 + + + + 0 + + -50 + + + 0 + + + + 0 + + -51 + + + 0 + + + + 0 + + -52 + + + 9 + 2 + [@(:link + 1 + + 0 + + -9 + + + 2 + mod="m":) const & (:link + 1 + + 0 + + -52 + + + 2 + mod="m":)() const; (:link + 1 + + 0 + + -9 + + + 2 + mod="m":) & (:link + 1 + + 0 + + -52 + + + 2 + mod="m":)();@] + + + + 0 + + -53 + + + 3 + 2 + [@class (:link + 1 + + 0 + + -53 + + + 2 + :);@] + + + + 0 + + -54 + + + 3 + 2 + [@template <class Tag,class T> class (:link + 1 + + 0 + + -54 + + + 2 + :);@] + + + + 0 + + -55 + + + 5 + 2 + [@(:link + 1 + + 0 + + -55 + + + 2 + mod="m":)( (:link + 1 + + 0 + + -9 + + + 2 + mod="m":) const & v );@] + + + + 0 + + -56 + + + 0 + + + + 0 + + -57 + + + 0 + + + + 0 + + -58 + + + 0 + + + + 0 + + -59 + + + 0 + + + + 0 + + -60 + + + 0 + + + + 0 + + -61 + + + 0 + + + + 0 + + -62 + + + 5 + 2 + [@(:link + 1 + + 0 + + -69 + + + 2 + :) (:link + 1 + + 0 + + -62 + + + 2 + :)();@] + + + + 0 + + -63 + + + 3 + 2 + [@template <class T> ---unspecified--- (:link + 1 + + 0 + + -63 + + + 2 + :)( T const & x );@] + + + + 0 + + -64 + + + 0 + + + + 0 + + -65 + + + 0 + + + + 0 + + -66 + + + 0 + + + + 0 + + -67 + + + 5 + 2 + [@#ifdef BOOST_NO_EXCEPTIONS void (:link + 1 + + 0 + + -67 + + + 2 + :)( std::exception const & e ); // user defined #else template <class E> void (:link + 1 + + 0 + + -67 + + + 2 + :)( E const & e ); #endif@] + + + + 0 + + -68 + + + 1 + 2 + [@template <class ErrorInfo,class E> typename ErrorInfo::(:link error_info::value_type mod="m":) const * (:link get_error_info:)( E const & x ); template <class ErrorInfo,class E> typename ErrorInfo::(:link error_info::value_type mod="m":) * (:link get_error_info:)( E & x );@] + + + + 0 + + -69 + + + 3 + 2 + [@typedef ---unspecified--- (:link + 1 + + 0 + + -69 + + + 2 + :);@] + + + + 0 + + -70 + + + 0 + + + + 0 + + -71 + + + 3 + 2 + [@template <class E> E * + 1 + + 0 + + -71 + + + 2 + ();@] + + + + 0 + + -72 + + + 0 + + + + 0 + + -73 + + + 0 + + + + 0 + + -74 + + + 0 + + + + 0 + + -75 + + + 0 + + + + 0 + + -76 + + + 0 + + + + 0 + + -77 + + + 5 + 2 + [@class (:link + 1 + + 0 + + -77 + + + 2 + :): public std::exception public boost:: + 1 + + 0 + + -53 + + + 2 + { ---unspecified--- };@] + + + + 0 + + -78 + + + 0 + + + + 0 + + -79 + + + 0 + + + + + + + include + + 83 + + reno_layer + + + + 75 + + + 0 + + -5 + + + 7 + 2 + (:auto !!!:) (:include synopsis:) This type is designed to be used as a standard (:link + 1 + + 0 + + -54 + + + 2 + :) instance for transporting the name of a relevant API function (which does not use exceptions to report errors) in exceptions deriving from boost::(:link + 1 + + 0 + + -53 + + + 2 + :). !!!Example: (:include + 1 + + 0 + + -46 + + + 2 + :) + + + + 0 + + -6 + + + 69 + 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 + + -30 + + + 2 + |copying:) of exception objects, implemented non-intrusively and automatically by the boost::(:link + 1 + + 0 + + -67 + + + 2 + :) function. !!Contents #(:link + 1 + + 0 + + -57 + + + 2 + :) #Tutorial ##(:link + 1 + + 0 + + -49 + + + 2 + mod="w":) ##(:link + 1 + + 0 + + -58 + + + 2 + mod="w":) ##(:link + 1 + + 0 + + -30 + + + 2 + mod="w":) ##(:link + 1 + + 0 + + -45 + + + 2 + mod="w":) ##(:link + 1 + + 0 + + -24 + + + 2 + mod="w":) ##(:link + 1 + + 0 + + -26 + + + 2 + mod="w":) #Documentation ##Class (:link + 1 + + 0 + + -53 + + + 2 + :) ##Throwing Exceptions ###(:link + 1 + + 0 + + -33 + + + 2 + :) ###(:link + 1 + + 0 + + -67 + + + 2 + :) ##Transporting of Arbitrary Data to the Catch Site ###(:link + 1 + + 0 + + -54 + + + 2 + :) ###(:link + 1 + + 0 + + -19 + + + 2 + :) ###(:link + 1 + + 0 + + -27 + + + 2 + :) ###(:link + 1 + + 0 + + -68 + + + 2 + :) ###(:link + 1 + + 0 + + -63 + + + 2 + :) ##(:link http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html|N2179:) Transporting of Exceptions between Threads ###(:link + 1 + + 0 + + -69 + + + 2 + :) ###(:link + 1 + + 0 + + -32 + + + 2 + :) ###(:link + 1 + + 0 + + -62 + + + 2 + :) ###(:link + 1 + + 0 + + -12 + + + 2 + :) ###(:link + 1 + + 0 + + -23 + + + 2 + :) ###(:link + 1 + + 0 + + -77 + + + 2 + :) ##Diagnostic Information ###(:link + 1 + + 0 + + -13 + + + 2 + :) ###(:link + 1 + + 0 + + -47 + + + 2 + :) ##(:link + 1 + + 0 + + -71 + + + 2 + :) #API ##(:link + 1 + + 0 + + -21 + + + 2 + :) ##(:link + 1 + + 0 + + -35 + + + 2 + :) ##(:link + 1 + + 0 + + -8 + + + 2 + :) ##(:link + 1 + + 0 + + -10 + + + 2 + :) ##(:link + 1 + + 0 + + -61 + + + 2 + :) ##(:link + 1 + + 0 + + -22 + + + 2 + mod="w":) #(:link + 1 + + 0 + + -17 + + + 2 + mod="w":) #(:link + 1 + + 0 + + -74 + + + 2 + mod="w":) !!!Acknowledgements Thanks to Peter Dimov for his continuing help. Also thanks to Tobias Schwinger, Tom Brinkman, Pavel Vozenilek and everyone who participated in the review process. + + + + 0 + + -7 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -8 + + + 1 + 2 + (:auto !!:) (:pagelist fmt="index" tags="type":) + + + + 0 + + -9 + + + 5 + 2 + (:auto !!!:) (:include synopsis:) !!!!Definition: The expression + 1 + + 0 + + -54 + + + 2 + <Tag,T>::(:link + 1 + + 0 + + -9 + + + 2 + mod="m":) evaluates to T. + + + + 0 + + -10 + + + 1 + 2 + (:auto !!:) (:pagelist fmt="index" tags="function":) + + + + 0 + + -11 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -12 + + + 5 + 2 + (:auto !!!:) (:include synopsis:) !!!!Effects: As if [@try { throw + 1 + + 0 + + -32 + + + 2 + (e); } catch(...) { return (:link + 1 + + 0 + + -62 + + + 2 + :)(); }@] + + + + 0 + + -13 + + + 39 + 2 + (:auto !!!:) (:include synopsis:) !!!!Returns: A string value that contains varying amount of diagnostic information about the passed object: * If E can be statically converted to either boost::(:link + 1 + + 0 + + -53 + + + 2 + :) or to std::exception, dynamic_cast is used to access both the boost::(:link + 1 + + 0 + + -53 + + + 2 + :) and std::exception subobjects of e; otherwise, the boost::(:link + 1 + + 0 + + -13 + + + 2 + :) template is not available. * The returned value contains the string representations of all (:link + 1 + + 0 + + -54 + + + 2 + :) objects stored in the boost::(:link + 1 + + 0 + + -53 + + + 2 + :) subobject through (:link + 1 + + 0 + + -19 + + + 2 + mod="/":). * In addition, if verbose is true, it contains other diagnostic information relevant to the exception, including the string returned by std::exception::what(). The string representation of each (:link + 1 + + 0 + + -54 + + + 2 + :) object is deduced by an unqualified call to to_string(x), where x is of type (:link + 1 + + 0 + + -54 + + + 2 + :)<Tag,T>, for which Boost Exception defines a generic overload. It converts x.(:link + 1 + + 0 + + -52 + + + 2 + mod="m":)() to string, attempting to bind (at the time the (:link + 1 + + 0 + + -54 + + + 2 + :)<Tag,T> template is instantiated) the following functions in order: #Unqualified call to to_string(x.(:link + 1 + + 0 + + -52 + + + 2 + mod="m":)()) (the return value is expected to be of type std::string.) #Unqualified call to s << x.(:link + 1 + + 0 + + -52 + + + 2 + mod="m":)(), where s is a std::ostringstream. The first successfully bound function is used at the time (:link + 1 + + 0 + + -13 + + + 2 + :) is called; if both overload resolutions are unsuccessful, the system is unable to convert the (:link + 1 + + 0 + + -54 + + + 2 + :) object to string, and ''an unspecified stub string value is used without issuing a compile error.'' The (:link + 1 + + 0 + + -69 + + + 2 + :) overload of (:link + 1 + + 0 + + -13 + + + 2 + :) is equivalent to: [@if( p ) try { (:link + 1 + + 0 + + -23 + + + 2 + :)(p); } catch(...) { return (:link + 1 + + 0 + + -47 + + + 2 + :)(verbose); } else return <unspecified-string-value>;@] (:include + 1 + + 0 + + -72 + + + 2 + :) + + + + 0 + + -14 + + + 7 + 2 + (:auto !!!:) (:include synopsis:) This type is designed to be used as a standard (:link + 1 + + 0 + + -54 + + + 2 + :) instance for transporting (in exceptions deriving from boost::(:link + 1 + + 0 + + -53 + + + 2 + :)) an + 1 + + 0 + + -69 + + + 2 + to an exception nested into another exception. + + + + 0 + + -15 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -16 + + + 7 + 2 + (:auto !!!:) (:include synopsis:) This type is designed to be used as a standard (:link + 1 + + 0 + + -54 + + + 2 + :) instance for transporting a relevant FILE pointer managed by a boost::shared_ptr<FILE> in exceptions deriving from boost::(:link + 1 + + 0 + + -53 + + + 2 + :). !!!Example: (:include + 1 + + 0 + + -46 + + + 2 + :) + + + + 0 + + -17 + + + 81 + 2 + (:auto !!:) !!!What is the cost of calling boost::throw_exception? The cost is that boost::(:link + 1 + + 0 + + -53 + + + 2 + :) is added as a base of the exception emitted by boost::(:link + 1 + + 0 + + -67 + + + 2 + :) (unless the passed type already derives from boost::(:link + 1 + + 0 + + -53 + + + 2 + :).) Calling boost::(:link + 1 + + 0 + + -67 + + + 2 + :) does not cause dynamic memory allocations. !!!What is the cost of BOOST_THROW_EXCEPTION? In addition to calling boost::(:link + 1 + + 0 + + -67 + + + 2 + :), + 1 + + 0 + + -33 + + + 2 + invokes __FILE__, __LINE__ and the (:link + 1 + + 0 + + -22 + + + 2 + |BOOST_THROW_EXCEPTION_CURRENT_FUNCTION:) macros. The space required to store the information is already included in sizeof(boost::(:link + 1 + + 0 + + -53 + + + 2 + :)). Calling + 1 + + 0 + + -33 + + + 2 + does not cause dynamic memory allocations. !!!Should I use boost::throw_exception or BOOST_THROW_EXCEPTION or just throw? The benefit of calling boost::(:link + 1 + + 0 + + -67 + + + 2 + :) instead of using throw directly is that it ensures that the emitted exception derives from boost::(:link + 1 + + 0 + + -53 + + + 2 + :) and that it is compatible with boost::(:link + 1 + + 0 + + -62 + + + 2 + :). The (:link + 1 + + 0 + + -33 + + + 2 + :) macro also results in a call to boost::(:link + 1 + + 0 + + -67 + + + 2 + :), but in addition it records in the exception object the __FILE__ and __LINE__ of the throw, as well as the pretty name of the function that throws. This enables boost::(:link + 1 + + 0 + + -13 + + + 2 + :) to compose a more useful, if not user-friendly message. Typical use of boost::(:link + 1 + + 0 + + -13 + + + 2 + :) is: [@catch(...) { std::cerr << "Unexpected exception, diagnostic information follows:\n" << + 1 + + 0 + + -47 + + + 2 + (); }@] This is a possible message it may display -- the information in the first line is only available if (:link + 1 + + 0 + + -33 + + + 2 + :) was used to throw: [@example_io.cpp(70): Throw in function class boost::shared_ptr<struct _iobuf> __cdecl my_fopen(const char *,const char *) Dynamic exception type: class boost::exception_detail::clone_impl<class fopen_error> std::exception::what: example_io error [struct boost::(:link + 1 + + 0 + + -5 + + + 2 + :)_ *] = fopen [struct boost::(:link + 1 + + 0 + + -41 + + + 2 + :)_ *] = 2, "No such file or directory" [struct boost::(:link + 1 + + 0 + + -48 + + + 2 + :)_ *] = tmp1.txt [struct boost::(:link + 1 + + 0 + + -70 + + + 2 + :)_ *] = rb@] In some development environments, the first line in that message can be clicked to show the location of the throw in the debugger, so it's easy to set a break point and run again to see the unexpected throw in the context of its call stack. !!!Why doesn't boost::exception derive from std::exception? Despite that (:link + 1 + + 0 + + -24 + + + 2 + |virtual inheritance should be used in deriving from base exception types:), quite often exception types (including the ones defined in the standard library) don't derive from std::exception virtually. If boost::(:link + 1 + + 0 + + -53 + + + 2 + :) derives from std::exception, using the (:link + 1 + + 0 + + -63 + + + 2 + :) function with such user-defined types would introduce dangerous ambiguity which would break all catch(std::exception &) statements. Of course, boost::(:link + 1 + + 0 + + -53 + + + 2 + :) should not be used to replace std::exception as a base type in exception type hierarchies. Instead, it should be included as a virtual base, in addition to std::exception (which should probably also be derived virtually.) !!!Why is boost::exception abstract? To prevent exception-neutral contexts from erroneously erasing the type of the original exception when adding (:link + 1 + + 0 + + -54 + + + 2 + :) to an active exception object: [@catch( boost::(:link + 1 + + 0 + + -53 + + + 2 + :) & e ) { e (:link + 1 + + 0 + + -19 + + + 2 + |<<:) foo_info(foo); throw e; //Compile error: boost::(:link + 1 + + 0 + + -53 + + + 2 + :) is abstract }@] The correct code is: [@catch( boost::(:link + 1 + + 0 + + -53 + + + 2 + :) & e ) { e (:link + 1 + + 0 + + -19 + + + 2 + |<<:) foo_info(foo); throw; //Okay, re-throwing the original exception object. }@] !!!Why use operator<< overload for adding info to exceptions? Before throwing an object of type that derives from boost::(:link + 1 + + 0 + + -53 + + + 2 + :), it is often desirable to add one or more (:link + 1 + + 0 + + -54 + + + 2 + :) objects in it. The syntactic sugar provided by (:link + 1 + + 0 + + -19 + + + 2 + mod="/":) allows this to be done directly in a throw expression: [@throw error() (:link + 1 + + 0 + + -19 + + + 2 + |<<:) foo_info(foo) (:link + 1 + + 0 + + -19 + + + 2 + |<<:) bar_info(bar);@] !!!Why is operator<< allowed to throw? This question is referring to the following issue. Consider this throw statement example: [@throw file_open_error() (:link + 1 + + 0 + + -19 + + + 2 + |<<:) file_name(fn);@] The intention here is to throw a file_open_error, however if (:link + 1 + + 0 + + -19 + + + 2 + mod="/":) fails to copy the std::string contained in the file_name (:link + 1 + + 0 + + -54 + + + 2 + :) wrapper, a std::bad_alloc could propagate instead. This behavior seems undesirable to some programmers. Bjarne Stroustrup, The C++ Programming Language, 3rd Edition, page 371: ->''"Throwing an exception requires an object to throw. A C++ implementation is required to have enough spare memory to be able to throw bad_alloc in case of memory exhaustion. However, it is possible that throwing some other exception will cause memory exhaustion."'' Therefore, the language itself does not guarantee that an attempt to throw an exception is guaranteed to throw an object of the specified type; propagating a std::bad_alloc seems to be a possibility even outside of the scope of Boost Exception. + + + + 0 + + -18 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -19 + + + 7 + 2 + (:auto !!!:) (:include synopsis:) !!!!Requirements: E must be boost::(:link + 1 + + 0 + + -53 + + + 2 + :), or a type that derives (indirectly) from boost::(:link + 1 + + 0 + + -53 + + + 2 + :). !!!!Postcondition: A copy of v is stored into x. If x already contains data of type (:link + 1 + + 0 + + -54 + + + 2 + :)<Tag,T>, that data is overwritten. Basic exception safety guarantee. !!!!Returns: x. (:include throws:) + + + + 0 + + -20 + + + 7 + 2 + (:auto !!!:) (:include decl:) !!!!Effects: * Default constructor: initializes an empty boost::(:link + 1 + + 0 + + -53 + + + 2 + :) object. * Copy constructor: initializes a boost::(:link + 1 + + 0 + + -53 + + + 2 + :) object which shares ownership with x of all data added through (:link + 1 + + 0 + + -19 + + + 2 + mod="/":), including data that is added at a future time. !!!!Throws: Nothing. + + + + 0 + + -21 + + + 77 + 2 + !!Synopsis List of documented definitions, declarations and includes by header file: `#include <(:link + 1 + + 0 + + -50 + + + 2 + :)> [@(:include + 1 + + 0 + + -50 + + + 2 + synopsis:)@] `#include <(:link + 1 + + 0 + + -18 + + + 2 + :)> [@(:include + 1 + + 0 + + -18 + + + 2 + synopsis:)@] `#include <(:link + 1 + + 0 + + -25 + + + 2 + :)> [@(:include + 1 + + 0 + + -25 + + + 2 + synopsis:)@] `#include <(:link + 1 + + 0 + + -37 + + + 2 + :)> [@(:include + 1 + + 0 + + -37 + + + 2 + synopsis:)@] `#include <(:link + 1 + + 0 + + -78 + + + 2 + :)> [@(:include + 1 + + 0 + + -78 + + + 2 + synopsis:)@] `#include <(:link + 1 + + 0 + + -64 + + + 2 + :)> [@(:include + 1 + + 0 + + -64 + + + 2 + synopsis:)@] `#include <(:link + 1 + + 0 + + -42 + + + 2 + :)> [@(:include + 1 + + 0 + + -42 + + + 2 + synopsis:)@] `#include <(:link + 1 + + 0 + + -28 + + + 2 + :)> [@(:include + 1 + + 0 + + -28 + + + 2 + synopsis:)@] `#include <(:link + 1 + + 0 + + -36 + + + 2 + :)> [@(:include + 1 + + 0 + + -36 + + + 2 + synopsis:)@] `#include <(:link + 1 + + 0 + + -39 + + + 2 + :)> [@(:include + 1 + + 0 + + -39 + + + 2 + synopsis:)@] `#include <(:link + 1 + + 0 + + -59 + + + 2 + :)> (:include + 1 + + 0 + + -59 + + + 2 + synopsis:) `#include <(:link + 1 + + 0 + + -15 + + + 2 + :)> (:include + 1 + + 0 + + -15 + + + 2 + synopsis:) `#include <(:link + 1 + + 0 + + -40 + + + 2 + :)> (:include + 1 + + 0 + + -40 + + + 2 + synopsis:) `#include <(:link + 1 + + 0 + + -7 + + + 2 + :)> (:include + 1 + + 0 + + -7 + + + 2 + synopsis:) `#include <(:link + 1 + + 0 + + -66 + + + 2 + :)> (:include + 1 + + 0 + + -66 + + + 2 + synopsis:) `#include <(:link + 1 + + 0 + + -76 + + + 2 + :)> (:include + 1 + + 0 + + -76 + + + 2 + synopsis:) `#include < + 1 + + 0 + + -56 + + + 2 + > (:include + 1 + + 0 + + -56 + + + 2 + synopsis:) `#include <(:link + 1 + + 0 + + -44 + + + 2 + :)> (:include + 1 + + 0 + + -44 + + + 2 + synopsis:) `#include <(:link + 1 + + 0 + + -11 + + + 2 + :)> (:include + 1 + + 0 + + -11 + + + 2 + synopsis:) + + + + 0 + + -22 + + + 21 + 2 + (:auto !!:) Boost Exception responds to the following configuration macros: '''BOOST_NO_RTTI'''\\ '''BOOST_NO_TYPEID''' The first macro prevents Boost Exception from using dynamic_cast and dynamic typeid. If the second macro is also defined, Boost Exception does not use static typeid either. There are no observable degrading effects on the library functionality, except for the following: ->By default, the (:link + 1 + + 0 + + -68 + + + 2 + :) function template can be called with any exception type. If BOOST_NO_RTTI is defined, (:link + 1 + + 0 + + -68 + + + 2 + :) can be used only with objects of type boost::(:link + 1 + + 0 + + -53 + + + 2 + :). !!!!Note: The library needs RTTI functionality. Disabling the language RTTI support enables an internal RTTI system, which may have more or less overhead depending on the platform. '''BOOST_EXCEPTION_DISABLE''' By default, (:link + 1 + + 0 + + -32 + + + 2 + :) and (:link + 1 + + 0 + + -63 + + + 2 + :) are integrated directly in the (:link + 1 + + 0 + + -67 + + + 2 + :) function. Defining BOOST_EXCEPTION_DISABLE disables this integration. Note that on some non-conformant compilers, for example MSVC 7.0 and older, as well as BCC, BOOST_EXCEPTION_DISABLE is implicitly defined in (:link + 1 + + 0 + + -39 + + + 2 + :). '''BOOST_NO_EXCEPTIONS''' This macro disables exception handling in Boost, forwarding all exceptions to a user-defined non-template version of boost::(:link + 1 + + 0 + + -67 + + + 2 + :). However, unless BOOST_EXCEPTION_DISABLE is also defined, users can still examine the exception object for any data added at the point of the throw, or use boost::(:link + 1 + + 0 + + -13 + + + 2 + :) (of course under BOOST_NO_EXCEPTIONS, the user-defined boost::throw_exception is not allowed to return to the caller.) '''BOOST_THROW_EXCEPTION_CURRENT_FUNCTION''' The + 1 + + 0 + + -33 + + + 2 + macro uses BOOST_THROW_EXCEPTION_CURRENT_FUNCTION to record the name of the current function in the exception object. Unless overridden by the user, BOOST_THROW_EXCEPTION_CURRENT_FUNCTION expands to BOOST_CURRENT_FUNCTION. + + + + 0 + + -23 + + + 1 + 2 + (:auto !!!:) (:include synopsis:) !!!!Precondition: ep shall not be null. !!!!Throws: The exception to which ep refers. + + + + 0 + + -24 + + + 5 + 2 + (:auto !!!:) Exception types should use virtual inheritance when deriving from other exception types. This insight is due to Andrew Koenig. Using virtual inheritance prevents ambiguity problems in the exception handler: [@#include <iostream> struct my_exc1 : std::exception { char const* what() const throw(); }; struct my_exc2 : std::exception { char const* what() const throw(); }; struct your_exc3 : my_exc1, my_exc2 {}; int main() { try { throw your_exc3(); } catch(std::exception const& e) {} catch(...) { std::cout << "whoops!" << std::endl; } }@] The program above outputs "whoops!" because the conversion to std::exception is ambiguous. The overhead introduced by virtual inheritance is always negligible in the context of exception handling. Note that virtual bases are initialized directly by the constructor of the most-derived-type (the type passed to the throw statement, in case of exceptions.) However, typically this detail is of no concern when boost::(:link + 1 + + 0 + + -53 + + + 2 + :) is used, because it enables exception types to be trivial structs with no members (there's nothing to initialize.) See (:link + 1 + + 0 + + -45 + + + 2 + mod="w":). + + + + 0 + + -25 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -26 + + + 19 + 2 + (:auto !!:) Boost Exception provides a namespace-scope function (:link + 1 + + 0 + + -13 + + + 2 + :) which takes a boost::(:link + 1 + + 0 + + -53 + + + 2 + :). The returned string contains: *the string representation of all data objects added to the boost::(:link + 1 + + 0 + + -53 + + + 2 + :) through (:link + 1 + + 0 + + -19 + + + 2 + mod="/":); *the output from std::exception::what; *additional platform-specific diagnostic information. The returned string 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 + + -11 + + + 2 + :)> #include <iostream> void f(); //throws unknown types that derive from boost::(:link + 1 + + 0 + + -53 + + + 2 + :). void g() { try { f(); } catch( boost::(:link + 1 + + 0 + + -53 + + + 2 + :) & e ) { std::cerr << (:link + 1 + + 0 + + -13 + + + 2 + :)(e); } }@] (:include + 1 + + 0 + + -72 + + + 2 + :) + + + + 0 + + -27 + + + 5 + 2 + (:auto !!!:) (:include synopsis:) !!!!Requirements: E must be boost::(:link + 1 + + 0 + + -53 + + + 2 + :), or a type that derives (indirectly) from boost::(:link + 1 + + 0 + + -53 + + + 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 + + -28 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -29 + + + 9 + 2 + (:auto !!!:) (:include synopsis:) This + 1 + + 0 + + -54 + + + 2 + typedef is used by + 1 + + 0 + + -62 + + + 2 + if it defaults to returning an + 1 + + 0 + + -69 + + + 2 + that refers to an object of type + 1 + + 0 + + -77 + + + 2 + , to record in it the std::type_info of the original exception object. + + + + 0 + + -30 + + + 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 + + -32 + + + 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 + + -67 + + + 2 + :) are guaranteed to derive from boost::(:link + 1 + + 0 + + -53 + + + 2 + :) and to support cloning. (:include + 1 + + 0 + + -65 + + + 2 + :) (:include + 1 + + 0 + + -31 + + + 2 + :) + + + + 0 + + -31 + + + 37 + 2 + (:auto !!!:) When you catch an exception, you can call (:link + 1 + + 0 + + -62 + + + 2 + :) to get an (:link + 1 + + 0 + + -69 + + + 2 + :) object: [@#include <(:link + 1 + + 0 + + -28 + + + 2 + :)> #include <boost/thread.hpp> #include <boost/bind.hpp> void do_work(); //throws cloning-enabled boost::(:link + 1 + + 0 + + -53 + + + 2 + :)s void worker_thread( boost::(:link + 1 + + 0 + + -69 + + + 2 + :) & error ) { try { do_work(); error = boost::(:link + 1 + + 0 + + -69 + + + 2 + :)(); } catch( ... ) { error = boost::(:link + 1 + + 0 + + -62 + + + 2 + :)(); } }@] In the above example, note that (:link + 1 + + 0 + + -62 + + + 2 + :) captures the original type of the exception object. The exception can be thrown again using the (:link + 1 + + 0 + + -23 + + + 2 + :) function: [@// ...continued void work() { boost::(:link + 1 + + 0 + + -69 + + + 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 + + -23 + + + 2 + :)(error); }@] Note that (:link + 1 + + 0 + + -62 + + + 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 + + -69 + + + 2 + :) points to an instance of std::bad_alloc, or * if (:link + 1 + + 0 + + -32 + + + 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 + + -69 + + + 2 + :) points to an instance of (:link + 1 + + 0 + + -77 + + + 2 + :). Regardless, the use of (:link + 1 + + 0 + + -62 + + + 2 + :) and (:link + 1 + + 0 + + -23 + + + 2 + :) in the above examples is well-formed. + + + + 0 + + -32 + + + 21 + 2 + (:auto !!!:) (:include synopsis:) !!!!Requirements: * T must be a class with an accessible no-throw copy constructor. * If T has any virtual base types, those types must have an accessible default 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 + + -69 + + + 2 + :) support in Boost Exception. For example: [@class my_exception: public std::exception { }; .... throw boost::(:link + 1 + + 0 + + -32 + + + 2 + :)(my_exception());@] Unless (:link + 1 + + 0 + + -32 + + + 2 + :) is called at the time an exception object is used in a throw-expression, an attempt to copy it using (:link + 1 + + 0 + + -62 + + + 2 + :) may return an (:link + 1 + + 0 + + -69 + + + 2 + :) which refers to an instance of (:link + 1 + + 0 + + -77 + + + 2 + :). See (:link + 1 + + 0 + + -62 + + + 2 + :) for details. !!!!Note: Instead of using the throw keyword directly, it is preferable to call boost::(:link + 1 + + 0 + + -67 + + + 2 + :). This is guaranteed to throw an exception that derives from boost::(:link + 1 + + 0 + + -53 + + + 2 + :) and supports the (:link + 1 + + 0 + + -69 + + + 2 + :) functionality. + + + + 0 + + -33 + + + 7 + 2 + (:auto !!!:) (:include synopsis:) This macro takes an exception object, records the current function name, __FILE__ and __LINE__ in it, and forwards it to (:link + 1 + + 0 + + -67 + + + 2 + :). To recover this information at the catch site, use (:link + 1 + + 0 + + -68 + + + 2 + :); the information is also included in the message returned by (:link + 1 + + 0 + + -13 + + + 2 + :). + + + + 0 + + -34 + + + 3 + 2 + (:auto !!!:) (:include decl:) !!!!Effects: Frees all resources associated with a boost::(:link + 1 + + 0 + + -53 + + + 2 + :) object. !!!!Throws: Nothing. + + + + 0 + + -35 + + + 1 + 2 + (:auto !!:) (:pagelist tags="hpp" except_tags="noindex":) + + + + 0 + + -36 + + + 1 + 2 + (:auto !!!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -37 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -38 + + + 7 + 2 + (:auto !!!:) (:include synopsis:) The (:link + 1 + + 0 + + -38 + + + 2 + :) function is intended to be called from a user-defined std::exception::what() override. This allows diagnostic information to be returned as the what() string. !!!!Returns: A pointer to a zero-terminated buffer that contains a string similar to the std::string returned by the (:link + 1 + + 0 + + -13 + + + 2 + :) function, or null to indicate a failure. !!!!Throws: Nothing. !!!!Note: The returned pointer becomes invalid if any (:link + 1 + + 0 + + -54 + + + 2 + :) is modified or added to the exception object, or if another diagnostic information function is called. + + + + 0 + + -39 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -40 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -41 + + + 7 + 2 + (:auto !!!:) (:include synopsis:) This type is designed to be used as a standard (:link + 1 + + 0 + + -54 + + + 2 + :) instance for transporting a relevant errno value in exceptions deriving from boost::(:link + 1 + + 0 + + -53 + + + 2 + :). !!!Example: (:include + 1 + + 0 + + -46 + + + 2 + :) + + + + 0 + + -42 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -43 + + + 19 + 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 + + -37 + + + 2 + :)> #include <(:link + 1 + + 0 + + -66 + + + 2 + :)> #include <(:link + 1 + + 0 + + -59 + + + 2 + :)> #include <(:link + 1 + + 0 + + -40 + + + 2 + :)> #include <boost/shared_ptr.hpp> #include <stdio.h> #include <string> #include <errno.h> typedef boost::(:link http://www.boost.org/libs/tuple/doc/tuple_users_guide.html|tuple:)<boost::(:link + 1 + + 0 + + -5 + + + 2 + :),boost::(:link + 1 + + 0 + + -41 + + + 2 + :)> clib_failure; struct file_open_error: virtual boost::(:link + 1 + + 0 + + -53 + + + 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() << boost::(:link + 1 + + 0 + + -48 + + + 2 + :)(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 + + -68 + + + 2 + :). + + + + 0 + + -44 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -45 + + + 7 + 2 + (:auto !!!:) Deriving from boost::(:link + 1 + + 0 + + -53 + + + 2 + :) effectively decouples the semantics of a failure from the information that is relevant to each individual instance of reporting a failure with a given semantic. In other words: with boost::(:link + 1 + + 0 + + -53 + + + 2 + :), what data a given exception object transports depends primarily on the context in which failures are reported (not on its type.) Since exception types need no members, it becomes very natural to throw exceptions that derive from more than one type to indicate multiple appropriate semantics: [@struct exception_base: virtual std::exception, virtual boost::(:link + 1 + + 0 + + -53 + + + 2 + :) { }; struct io_error: virtual exception_base { }; struct file_error: virtual io_error { }; struct read_error: virtual io_error { }; struct file_read_error: virtual file_error, virtual read_error { };@] Using this approach, exception types become a simple tagging system for categorizing errors and selecting failures in exception handlers. + + + + 0 + + -46 + + + 37 + 2 + [@#include <(:link + 1 + + 0 + + -59 + + + 2 + :)> #include <(:link + 1 + + 0 + + -15 + + + 2 + :)> #include <(:link + 1 + + 0 + + -40 + + + 2 + :)> #include <(:link + 1 + + 0 + + -7 + + + 2 + :)> #include <(:link + 1 + + 0 + + -66 + + + 2 + :)> #include <(:link + 1 + + 0 + + -76 + + + 2 + :)> #include <(:link + 1 + + 0 + + -25 + + + 2 + :)> #include <(:link + 1 + + 0 + + -39 + + + 2 + :)> #include <boost/shared_ptr.hpp> #include <boost/weak_ptr.hpp> #include <stdio.h> #include <errno.h> #include <exception> struct error : virtual std::exception, virtual boost::(:link + 1 + + 0 + + -53 + + + 2 + :) { }; struct file_error : virtual error { }; struct file_open_error: virtual file_error { }; struct file_read_error: virtual file_error { }; boost::shared_ptr<FILE> open_file( char const * file, char const * mode ) { if( FILE * f=fopen(file,mode) ) return boost::shared_ptr<FILE>(f,fclose); else (:link + 1 + + 0 + + -33 + + + 2 + :)( file_open_error() << boost::(:link + 1 + + 0 + + -5 + + + 2 + :)("fopen") << boost::(:link + 1 + + 0 + + -41 + + + 2 + :)(errno) << boost::(:link + 1 + + 0 + + -48 + + + 2 + :)(file) << boost::(:link + 1 + + 0 + + -70 + + + 2 + :)(mode) ); } size_t read_file( boost::shared_ptr<FILE> const & f, void * buf, size_t size ) { size_t nr=fread(buf,1,size,f.get()); if( ferror(f.get()) ) (:link + 1 + + 0 + + -33 + + + 2 + :)( file_read_error() << boost::(:link + 1 + + 0 + + -5 + + + 2 + :)("fread") << boost::(:link + 1 + + 0 + + -41 + + + 2 + :)(errno) << boost::(:link + 1 + + 0 + + -16 + + + 2 + :)(f) ); return nr; }@] + + + + 0 + + -47 + + + 9 + 2 + (:auto !!!:) (:include synopsis:) !!!!Requirements: This function must not be called outside of a catch block. !!!!Returns: If the current exception object can be converted to boost::(:link + 1 + + 0 + + -53 + + + 2 + :) or std::exception, this function returns the same string value returned by (:link + 1 + + 0 + + -13 + + + 2 + :) for the current exception object. Otherwise, an unspecified non-empty string is returned. Typical use is to call + 1 + + 0 + + -47 + + + 2 + from a top-level function to output diagnostic information about unhandled exceptions: [@int main() { try { run_program(); } catch( error & e ) { //handle error } catch( ...) { std::cerr << "Unhandled exception!" << std::endl << boost:: + 1 + + 0 + + -47 + + + 2 + (); } }@] + + + + 0 + + -48 + + + 7 + 2 + (:auto !!!:) (:include synopsis:) This type is designed to be used as a standard (:link + 1 + + 0 + + -54 + + + 2 + :) instance for transporting a relevant file name in exceptions deriving from boost::(:link + 1 + + 0 + + -53 + + + 2 + :). !!!Example: (:include + 1 + + 0 + + -46 + + + 2 + :) + + + + 0 + + -49 + + + 11 + 2 + (:auto !!:) All exception types that derive from boost::(:link + 1 + + 0 + + -53 + + + 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. When exceptions derive from boost::(:link + 1 + + 0 + + -53 + + + 2 + :), arbitrary data can be added to exception objects: *At the point of the throw; *At a later time as exceptions bubble up the call stack. (:include + 1 + + 0 + + -75 + + + 2 + :) (:include + 1 + + 0 + + -51 + + + 2 + :) (:include + 1 + + 0 + + -43 + + + 2 + :) + + + + 0 + + -50 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -51 + + + 19 + 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. Let's say we have an exception type file_read_error, which takes a file name in its constructor. Consider the following function: [@void file_read( FILE * f, void * buffer, size_t size ) { if( size!=fread(buffer,1,size,f) ) throw file_read_error(????); }@] How can the file_read function pass a file name to the exception type constructor? All it has is a FILE handle. Using boost::(:link + 1 + + 0 + + -53 + + + 2 + :) allows us to free the file_read function from the burden of storing the file name in exceptions it throws: [@`#include <(:link + 1 + + 0 + + -11 + + + 2 + :)> #include <boost/shared_ptr.hpp> #include <stdio.h> #include <errno.h> struct file_read_error: virtual boost::(:link + 1 + + 0 + + -53 + + + 2 + :) { }; void file_read( FILE * f, void * buffer, size_t size ) { if( size!=fread(buffer,1,size,f) ) throw file_read_error() << boost::(:link + 1 + + 0 + + -41 + + + 2 + :)(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 + + -11 + + + 2 + :)> #include <boost/shared_ptr.hpp> #include <stdio.h> #include <string> 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 + + -53 + + + 2 + :) & e ) { e << boost::(:link + 1 + + 0 + + -48 + + + 2 + :)(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 + + -53 + + + 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 + + -53 + + + 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''. + + + + 0 + + -52 + + + 5 + 2 + (:auto !!!:) (:include synopsis:) !!!!Description: Returns a (const) reference to the copy of the value passed to (:link + 1 + + 0 + + -54 + + + 2 + :)'s constructor stored in the (:link + 1 + + 0 + + -54 + + + 2 + :) object. !!!!Throws: Nothing. + + + + 0 + + -53 + + + 13 + 2 + (:auto !!!:) (:include synopsis:) Class boost::(:link + 1 + + 0 + + -53 + + + 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 + + -53 + + + 2 + :) can store data of arbitrary types, using the (:link + 1 + + 0 + + -54 + + + 2 + :) wrapper and (:link + 1 + + 0 + + -19 + + + 2 + mod="/":). To retrieve data from a boost::(:link + 1 + + 0 + + -53 + + + 2 + :) object, use the (:link + 1 + + 0 + + -68 + + + 2 + :) function template. + + + + 0 + + -54 + + + 41 + 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 + + -54 + + + 2 + :)<Tag,T> can be passed to (:link + 1 + + 0 + + -19 + + + 2 + mod="/":) to be stored in objects of type boost::(:link + 1 + + 0 + + -53 + + + 2 + :). !!!!Usage: The header <(:link + 1 + + 0 + + -18 + + + 2 + :)> provides a declaration of the (:link + 1 + + 0 + + -54 + + + 2 + :) template, which is sufficient for the purpose of typedefing an instance for specific Tag and T, for example: [@#include <(:link + 1 + + 0 + + -18 + + + 2 + :)> struct tag_errno; typedef boost::(:link + 1 + + 0 + + -54 + + + 2 + :)<tag_errno,int> errno_info;@] Or, the shorter equivalent: [@#include <(:link + 1 + + 0 + + -18 + + + 2 + :)> typedef boost::(:link + 1 + + 0 + + -54 + + + 2 + :)<struct tag_errno,int> errno_info;@] This errno_info typedef can be passed to (:link + 1 + + 0 + + -19 + + + 2 + mod="/":) (#include <(:link + 1 + + 0 + + -25 + + + 2 + :)> first) to store an int named tag_errno in exceptions of types that derive from boost::(:link + 1 + + 0 + + -53 + + + 2 + :): [@throw file_read_error() (:link + 1 + + 0 + + -19 + + + 2 + |<<:) errno_info(errno);@] It can also be passed to (:link + 1 + + 0 + + -68 + + + 2 + :) (#include <(:link + 1 + + 0 + + -60 + + + 2 + :)> first) to retrieve the tag_errno int from a boost::(:link + 1 + + 0 + + -53 + + + 2 + :): [@catch( boost::(:link + 1 + + 0 + + -53 + + + 2 + :) & x ) { if( int const * e=boost::(:link + 1 + + 0 + + -68 + + + 2 + :)<errno_info>(x) ) .... }@] For convenience and uniformity, Boost Exception defines the following commonly used (:link + 1 + + 0 + + -54 + + + 2 + :) typedefs, ready for use with (:link + 1 + + 0 + + -19 + + + 2 + mod="/":): (:pagelist tags="error_info_instance":) + + + + 0 + + -55 + + + 3 + 2 + (:auto !!!:) (:include synopsis:) !!!!Effects: Stores a copy of v in the + 1 + + 0 + + -54 + + + 2 + object. (:include throws:) + + + + 0 + + -56 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -57 + + + 33 + 2 + (:auto !!!:) Traditionally, when using exceptions to report failures, the throw site: *creates an exception object of the appropriate type, and *stuffs it with data relevant to the detected error. A higher context in the program contains a catch statement which: *selects failures based on exception types, and *inspects exception objects for data required to deal with the problem. The main issue with this "traditional" approach is that often, the data available at the point of the throw is insufficient for the catch site to handle the failure. Here is an example of a catch statement: [@catch( file_read_error & e ) { std::cerr << e.file_name(); }@] And here is a possible matching throw: [@void read_file( FILE * f ) { .... size_t nr=fread(buf,1,count,f); if( ferror(f) ) throw file_read_error(???); .... }@] Clearly, the problem is that the handler requires a file name but the read_file function does not have a file name to put in the exception object; all it has is a FILE pointer! In an attempt to deal with this problem, we could modify read_file to accept a file name: [@void read_file( FILE * f, char const * name ) { .... size_t nr=fread(buf,1,count,f); if( ferror(f) ) throw file_read_error(name); .... }@] This is not a real solution: it simply shifts the burden of supplying a file name to the immediate caller of the read_file function. ->''In general, the data required to handle a given library-emitted exception depends on the program that links to it. Many contexts between the throw and the catch may have relevant information which must be transported to the exception handler.'' !!!Exception wrapping The idea of exception wrapping is to catch an exception from a lower level function (such as the read_file function above), and throw a new exception object that contains the original exception (and also carries a file name.) This method seems to be particularly popular with C++ programmers with Java background. Exception wrapping leads to the following problems: *To wrap an exception object it must be copied, which may result in slicing. *Wrapping is practically impossible to use in generic contexts. The second point is actually special case of violating the exception neutrality principle. Most contexts in a program can not handle exceptions; such contexts should not interfere with the process of exception handling. !!!The boost::exception solution *Simply derive your exception types from boost::(:link + 1 + + 0 + + -53 + + + 2 + :). *Confidently limit the throw site to provide only data that is available naturally. *Use exception-neutral contexts between the throw and the catch to augment exceptions with more relevant data as they bubble up. For example, in the throw statement below we only add the errno code, since this is the only failure-relevant information available in this context: [@struct exception_base: virtual std::exception, virtual boost::(:link + 1 + + 0 + + -53 + + + 2 + :) { }; struct io_error: virtual exception_base { }; struct file_read_error: virtual io_error { }; typedef boost::(:link + 1 + + 0 + + -54 + + + 2 + :)<struct tag_errno_code,int> errno_code; void read_file( FILE * f ) { .... size_t nr=fread(buf,1,count,f); if( ferror(f) ) throw file_read_error() (:link + 1 + + 0 + + -19 + + + 2 + |<<:) errno_code(errno); .... }@] In a higher exception-neutral context, we add the file name to ''any'' exception that derives from boost::(:link + 1 + + 0 + + -53 + + + 2 + :): [@typedef boost::(:link + 1 + + 0 + + -54 + + + 2 + :)<struct tag_file_name,std::string> file_name; .... try { if( FILE * fp=fopen("foo.txt","rt") ) { shared_ptr<FILE> f(fp,fclose); .... read_file(fp); //throws types deriving from boost::(:link + 1 + + 0 + + -53 + + + 2 + :) do_something(); .... } else throw file_open_error() (:link + 1 + + 0 + + -19 + + + 2 + |<<:) errno_code(errno); } catch( boost::(:link + 1 + + 0 + + -53 + + + 2 + :) & e ) { e (:link + 1 + + 0 + + -19 + + + 2 + |<<:) file_name("foo.txt"); throw; }@] Finally here is how the handler retrieves data from exceptions that derive from boost::(:link + 1 + + 0 + + -53 + + + 2 + :): [@catch( io_error & e ) { std::cerr << "I/O Error!\n"; if( std::string const * fn=(:link + 1 + + 0 + + -68 + + + 2 + :)<file_name>(e) ) std::cerr << "File name: " << *fn << "\n"; if( int const * c=(:link + 1 + + 0 + + -68 + + + 2 + :)<errno_code>(e) ) std::cerr << "OS says: " << strerror(*c) << "\n"; }@] In addition, boost::(:link + 1 + + 0 + + -13 + + + 2 + :) can be used to compose an automatic (if not user-friendly) message that contains all of the (:link + 1 + + 0 + + -54 + + + 2 + :) objects added to a boost::(:link + 1 + + 0 + + -53 + + + 2 + :). This is useful for inclusion in logs and other diagnostic objects. + + + + 0 + + -58 + + + 27 + 2 + (:auto !!:) Some exception hierarchies can not be modified to make boost::(:link + 1 + + 0 + + -53 + + + 2 + :) a base type. In this case, the (:link + 1 + + 0 + + -63 + + + 2 + :) function template can be used to make exception objects derive from boost::(:link + 1 + + 0 + + -53 + + + 2 + :) anyway. Here is an example: [@#include <(:link + 1 + + 0 + + -11 + + + 2 + :)> #include <stdexcept> typedef boost::(:link + 1 + + 0 + + -54 + + + 2 + :)<struct tag_std_range_min,size_t> std_range_min; typedef boost::(:link + 1 + + 0 + + -54 + + + 2 + :)<struct tag_std_range_max,size_t> std_range_max; typedef boost::(:link + 1 + + 0 + + -54 + + + 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 + + -63 + + + 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 + + -63 + + + 2 + :)<T> gets us an object of ''unspecified type'' which is guaranteed to derive from both boost::(:link + 1 + + 0 + + -53 + + + 2 + :) and T. This makes it possible to use (:link + 1 + + 0 + + -19 + + + 2 + mod="/":) 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 + + -53 + + + 2 + :) &, so that (:link + 1 + + 0 + + -49 + + + 2 + |more information can be added to the exception at a later time:). + + + + 0 + + -59 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -60 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -61 + + + 1 + 2 + (:auto !!:) (:pagelist tags="macro":) + + + + 0 + + -62 + + + 39 + 2 + (:auto !!!:) (:include synopsis:) !!!!Requirements: The (:link + 1 + + 0 + + -62 + + + 2 + :) function must not be called outside of a catch block. In addition, to safely copy an exception from one thread to another, if the exception object is copied by + 1 + + 0 + + -62 + + + 2 + or + 1 + + 0 + + -12 + + + 2 + , the two copies must not have shared state. Exceptions that have value-type semantics (as well as the boost:: + 1 + + 0 + + -53 + + + 2 + type itself) satisfy this requirement. !!!!Returns: * An (:link + 1 + + 0 + + -69 + + + 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 + + -69 + + + 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 + + -62 + + + 2 + :) refer to the same exception object. * Correct implementation of (:link + 1 + + 0 + + -62 + + + 2 + :) may require compiler support, unless (:link + 1 + + 0 + + -32 + + + 2 + :) was used at the time the currently handled exception object was passed to throw. Whenever (:link + 1 + + 0 + + -62 + + + 2 + :) fails to properly copy the current exception object, it returns an (:link + 1 + + 0 + + -69 + + + 2 + :) to an object of type that is as close as possible to the original exception type, using (:link + 1 + + 0 + + -77 + + + 2 + :) as a final fallback. All such types derive from boost::(:link + 1 + + 0 + + -53 + + + 2 + :), and: ** if the original exception object derives from boost::(:link + 1 + + 0 + + -53 + + + 2 + :), then the boost::(:link + 1 + + 0 + + -53 + + + 2 + :) sub-object of the object referred to by the returned (:link + 1 + + 0 + + -69 + + + 2 + :) is initialized by the boost::(:link + 1 + + 0 + + -53 + + + 2 + :) copy constructor; ** if available, the exception contains the std::type_info of the original exception object, accessible through (:link + 1 + + 0 + + -68 + + + 2 + :)<(:link + 1 + + 0 + + -29 + + + 2 + :)>. + + + + 0 + + -63 + + + 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 + + -53 + + + 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 + + -53 + + + 2 + :). The T sub-object is initialized from x by the T copy constructor. !!!!Throws: Nothing. + + + + 0 + + -64 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -65 + + + 15 + 2 + (:auto !!!:) Here is how cloning can be enabled in a throw-expression (15.1): [@#include <(:link + 1 + + 0 + + -25 + + + 2 + :)> #include <(:link + 1 + + 0 + + -40 + + + 2 + :)> #include <stdio.h> #include <errno.h> struct file_read_error: virtual boost::(:link + 1 + + 0 + + -53 + + + 2 + :) { }; void file_read( FILE * f, void * buffer, size_t size ) { if( size!=fread(buffer,1,size,f) ) throw boost::(:link + 1 + + 0 + + -32 + + + 2 + :)(file_read_error()) << boost::(:link + 1 + + 0 + + -41 + + + 2 + :)(errno); }@] Of course, (:link + 1 + + 0 + + -32 + + + 2 + :) may be used with any exception type; there is no requirement that it should derive from boost::(:link + 1 + + 0 + + -53 + + + 2 + :). + + + + 0 + + -66 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -67 + + + 15 + 2 + (:auto !!!:) (:include synopsis:) !!!!Effects: * If BOOST_NO_EXCEPTIONS is not defined, boost::(:link + 1 + + 0 + + -67 + + + 2 + :)(e) throws an exception of unspecified type that derives publicly from E and from boost:: + 1 + + 0 + + -53 + + + 2 + . * If BOOST_NO_EXCEPTIONS is defined, the function is left undefined, and the user is expected to supply an appropriate definition. Callers of (:link + 1 + + 0 + + -67 + + + 2 + :) are allowed to assume that the function never returns; therefore, if the user-defined (:link + 1 + + 0 + + -67 + + + 2 + :) returns, the behavior is undefined. !!!!Requirements: E must derive publicly from std::exception. E may or may not derive from boost:: + 1 + + 0 + + -53 + + + 2 + . !!!!Notes: * The emitted exception can be intercepted as E &, std::exception &, or boost::exception &. * The emitted exception supports boost:: + 1 + + 0 + + -69 + + + 2 + . * If BOOST_EXCEPTION_DISABLE is defined and BOOST_NO_EXCEPTIONS is not defined, boost:: + 1 + + 0 + + -67 + + + 2 + (e) equivalent to throw e. + + + + 0 + + -68 + + + 13 + 2 + (:auto !!!:) (:include synopsis:) !!!!Requirements: * ErrorInfo must be an instance of the (:link + 1 + + 0 + + -54 + + + 2 + :) template. * E must be polymorphic. !!!!Returns: * If dynamic_cast<boost::(:link + 1 + + 0 + + -53 + + + 2 + :) const *>(&x) is 0, or if x does not store an object of type ErrorInfo, the returned value is null. * Otherwise, the returned pointer points to the stored value (use (:link + 1 + + 0 + + -19 + + + 2 + mod="/":) to store values in exception objects.) When x is destroyed, any pointers returned by (:link + 1 + + 0 + + -68 + + + 2 + :) become invalid. !!!!Throws: Nothing. !!!!Note: The interface of (:link + 1 + + 0 + + -68 + + + 2 + :) may be affected by the build (:link + 1 + + 0 + + -22 + + + 2 + :). + + + + 0 + + -69 + + + 23 + 2 + (:auto !!!:) (:include synopsis:) The (:link + 1 + + 0 + + -69 + + + 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 + + -69 + + + 2 + :)'s operations do not throw. The referenced object remains valid at least as long as there is an (:link + 1 + + 0 + + -69 + + + 2 + :) object that refers to it. Two instances of (:link + 1 + + 0 + + -69 + + + 2 + :) are equivalent and compare equal if and only if they refer to the same exception. The default constructor of (:link + 1 + + 0 + + -69 + + + 2 + :) produces the null value of the type. The null value is equivalent only to itself. !!!!Thread safety: The + 1 + + 0 + + -69 + + + 2 + type is "as thread-safe as built-in types": * An + 1 + + 0 + + -69 + + + 2 + instance can be "read" simultaneously by multiple threads * Different + 1 + + 0 + + -69 + + + 2 + instances can be "written to" simultaneously by multiple threads, even when these instances refer to the same exception object All other simultaneous accesses result in undefined behavior. !!!!Nesting of exceptions: An (:link + 1 + + 0 + + -69 + + + 2 + :) can be added as (:link + 1 + + 0 + + -54 + + + 2 + :) to any boost::(:link + 1 + + 0 + + -53 + + + 2 + :). This is a convenient way to nest exceptions. There is no limit on the depth of the nesting, however cyclic references result in undefined behavior. + + + + 0 + + -70 + + + 7 + 2 + (:auto !!!:) (:include synopsis:) This type is designed to be used as a standard (:link + 1 + + 0 + + -54 + + + 2 + :) instance for transporting the string passed as a second argument to fopen in exceptions indicating fopen failures and deriving from boost::(:link + 1 + + 0 + + -53 + + + 2 + :). !!!Example: (:include + 1 + + 0 + + -46 + + + 2 + :) + + + + 0 + + -71 + + + 1 + 2 + (:auto !!!:) (:include synopsis:) !!!!Requirements: This function must not be called outside of a catch block. !!!!Returns: A pointer of type E to the current exception object, or null if the current exception object can not be converted to E *. !!!!Throws: Nothing. + + + + 0 + + -72 + + + 11 + 2 + !!!!Example: this is a possible output from the (:link + 1 + + 0 + + -13 + + + 2 + :) function, as used in ''libs/exception/example/example_io.cpp:'' [@example_io.cpp(70): Throw in function class boost::shared_ptr<struct _iobuf> __cdecl my_fopen(const char *,const char *) Dynamic exception type: class boost::exception_detail::clone_impl<struct fopen_error> std::exception::what: example_io error [struct boost::(:link + 1 + + 0 + + -5 + + + 2 + :)_ *] = fopen [struct boost::(:link + 1 + + 0 + + -41 + + + 2 + :)_ *] = 2, "No such file or directory" [struct boost::(:link + 1 + + 0 + + -48 + + + 2 + :)_ *] = tmp1.txt [struct boost::(:link + 1 + + 0 + + -70 + + + 2 + :)_ *] = rb@] + + + + 0 + + -73 + + + 7 + 2 + (:auto !!!:) (:include synopsis:) This type is designed to be used as a standard (:link + 1 + + 0 + + -54 + + + 2 + :) instance for transporting a relevant text file line number, for example in parse error exceptions deriving from boost::(:link + 1 + + 0 + + -53 + + + 2 + :). !!!Example: (:include + 1 + + 0 + + -46 + + + 2 + :) + + + + 0 + + -74 + + + 1 + 2 + (:auto !:) This is an alphabetical list of all Boost Exception documentation pages. (:pagelist fmt="index" except_tags="index noindex" mod="w":) + + + + 0 + + -75 + + + 17 + 2 + (:auto !!!:) The following example demonstrates how errno can be stored in exception objects using Boost Exception: [@#include <(:link + 1 + + 0 + + -11 + + + 2 + :)> #include <iostream> typedef boost::(:link + 1 + + 0 + + -54 + + + 2 + :)<struct tag_my_info,int> my_info; //(1) struct my_error: virtual boost::(:link + 1 + + 0 + + -53 + + + 2 + :), virtual std::exception { }; //(2) void f() { throw my_error() << my_info(42); //(3) }@] First, we instantiate the (:link + 1 + + 0 + + -54 + + + 2 + :) template using a unique identifier -- tag_my_info, 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 + + -53 + + + 2 + :). Finally, (3) illustrates how the typedef from (1) can be used with (:link + 1 + + 0 + + -19 + + + 2 + |operator<<:) to store values in exception objects at the point of the throw. The stored my_info value can be recovered at a later time like this: [@// ...continued void g() { try { f(); } catch( my_error & x ) { if( int const * mi=boost::(:link + 1 + + 0 + + -68 + + + 2 + :)<my_info>(x) ) std::cerr << "My info: " << *mi; } }@] The (:link + 1 + + 0 + + -68 + + + 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, err will point to it; otherwise a null pointer is returned. + + + + 0 + + -76 + + + 1 + 2 + (:auto !!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -77 + + + 5 + 2 + (:auto !!!:) (:include synopsis:) This type is used by the (:link + 1 + + 0 + + -69 + + + 2 + :) support in Boost Exception. Please see (:link + 1 + + 0 + + -62 + + + 2 + :). + + + + 0 + + -78 + + + 1 + 2 + (:auto !!!:) !!!Synopsis (:include synopsis:) + + + + 0 + + -79 + + + 5 + 2 + (:auto !!!:) (:include synopsis:) This type is designed to be used as a standard + 1 + + 0 + + -54 + + + 2 + instance for transporting strings returned by std::type_info::name in exceptions deriving from boost:: + 1 + + 0 + + -53 + + + 2 + objects. + + + + + + + throws + + 84 + + reno_layer + + + + 75 + + + 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 + + + 1 + 2 + !!!!Throws: std::bad_alloc, or any exception emitted by the T copy constructor. + + + + 0 + + -20 + + + 0 + + + + 0 + + -21 + + + 0 + + + + 0 + + -22 + + + 0 + + + + 0 + + -23 + + + 0 + + + + 0 + + -24 + + + 0 + + + + 0 + + -25 + + + 0 + + + + 0 + + -26 + + + 0 + + + + 0 + + -27 + + + 1 + 2 + !!!!Throws: std::bad_alloc, or any exception emitted by T1..TN copy constructor. + + + + 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 + + + + 0 + + -44 + + + 0 + + + + 0 + + -45 + + + 0 + + + + 0 + + -46 + + + 0 + + + + 0 + + -47 + + + 0 + + + + 0 + + -48 + + + 0 + + + + 0 + + -49 + + + 0 + + + + 0 + + -50 + + + 0 + + + + 0 + + -51 + + + 0 + + + + 0 + + -52 + + + 0 + + + + 0 + + -53 + + + 0 + + + + 0 + + -54 + + + 0 + + + + 0 + + -55 + + + 1 + 2 + !!!!Throws: Any exception emitted by v's copy constructor. + + + + 0 + + -56 + + + 0 + + + + 0 + + -57 + + + 0 + + + + 0 + + -58 + + + 0 + + + + 0 + + -59 + + + 0 + + + + 0 + + -60 + + + 0 + + + + 0 + + -61 + + + 0 + + + + 0 + + -62 + + + 0 + + + + 0 + + -63 + + + 0 + + + + 0 + + -64 + + + 0 + + + + 0 + + -65 + + + 0 + + + + 0 + + -66 + + + 0 + + + + 0 + + -67 + + + 0 + + + + 0 + + -68 + + + 0 + + + + 0 + + -69 + + + 0 + + + + 0 + + -70 + + + 0 + + + + 0 + + -71 + + + 0 + + + + 0 + + -72 + + + 0 + + + + 0 + + -73 + + + 0 + + + + 0 + + -74 + + + 0 + + + + 0 + + -75 + + + 0 + + + + 0 + + -76 + + + 0 + + + + 0 + + -77 + + + 0 + + + + 0 + + -78 + + + 0 + + + + 0 + + -79 + + + 0 + + + + + + + synopsis + + 85 + + reno_layer + + + + 75 + + + 0 + + -5 + + + 5 + 2 + `#include < + 1 + + 0 + + -59 + + + 2 + > (:include + 1 + + 0 + + -59 + + + 2 + synopsis:) + + + + 0 + + -6 + + + 0 + + + + 0 + + -7 + + + 3 + 2 + [@#include <(:link + 1 + + 0 + + -18 + + + 2 + :)> namespace boost { template <class> class weak_ptr; (:include api pre_indent="4":) }@] + + + + 0 + + -8 + + + 0 + + + + 0 + + -9 + + + 3 + 2 + `#include <(:link + 1 + + 0 + + -25 + + + 2 + :)> [@(:include decl:)@] + + + + 0 + + -10 + + + 0 + + + + 0 + + -11 + + + 1 + 2 + [@(:include api:)@] + + + + 0 + + -12 + + + 3 + 2 + `#include <(:link + 1 + + 0 + + -28 + + + 2 + :)> [@namespace boost { (:include decl pre_indent="4":) }@] + + + + 0 + + -13 + + + 5 + 2 + `#include <(:link + 1 + + 0 + + -64 + + + 2 + :)>\\ `#include < + 1 + + 0 + + -28 + + + 2 + >\\ [@namespace boost { (:include decl pre_indent="4":) }@] + + + + 0 + + -14 + + + 5 + 2 + `#include < + 1 + + 0 + + -56 + + + 2 + > (:include + 1 + + 0 + + -56 + + + 2 + synopsis:) + + + + 0 + + -15 + + + 3 + 2 + [@#include <(:link + 1 + + 0 + + -18 + + + 2 + :)> namespace boost { (:include api pre_indent="4":) }@] + + + + 0 + + -16 + + + 5 + 2 + `#include <(:link + 1 + + 0 + + -7 + + + 2 + :)> (:include + 1 + + 0 + + -7 + + + 2 + synopsis:) + + + + 0 + + -17 + + + 0 + + + + 0 + + -18 + + + 1 + 2 + 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