std::nested_exception

 

C++

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Operazioni atomicche(C++11)

Multithreading(C++11)

 

Utilità libreria

Tipo di supporto (basic types, RTTI, type traits)

Gestione della memoria dinamica

La gestione degli errori

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Data e ora

Funzione oggetti

initializer_list (C++11)

bitset

hash (C++11)

Gli operatori relazionali Original: Relational operators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

Coppie e tuple Original: Pairs and tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

pair

tuple (C++11)

piecewise_construct_t (C++11)

piecewise_construct (C++11)

Swap, in avanti e spostare Original: Swap, forward and move The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap

forward (C++11)

move (C++11)

move_if_noexcept (C++11)

declval (C++11)

 

La gestione degli errori

Gestione delle eccezioni Original: Exception handling The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

exception

uncaught_exception

exception_ptr (C++11)

make_exception_ptr (C++11)

current_exception (C++11)

rethrow_exception (C++11)

nested_exception (C++11)

throw_with_nested (C++11)

rethrow_if_nested (C++11)

Gestione delle eccezioni fallimenti Original: Exception handling failures The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

terminate

terminate_handler

get_terminate (C++11)

set_terminate

unexpected (deprecato)

bad_exception

unexpected_handler (deprecato)

get_unexpected (C++11)(deprecato)

set_unexpected (deprecato)

Eccezione categorie Original: Exception categories The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

logic_error

invalid_argument

domain_error

length_error

out_of_range

runtime_error

range_error

overflow_error

underflow_error

Codici di errore Original: Error codes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Codici di errore

errno

Asserzioni Original: Assertions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

assert

impianto system_error Original: system_error facility The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

error_category (C++11)

generic_category (C++11)

system_category (C++11)

error_condition (C++11)

errc (C++11)

error_code (C++11)

system_error (C++11)

 

Elemento definito nell'header <exception>
class nested_exception;		(dal C++11)

std::nested_exceptions è una classe intermedia polimorfico che può catturare e memorizzare l'eccezione corrente, che permette di annidare le eccezioni di tipi arbitrari all'interno di ogni altro.

Original:

std::nested_exceptions is a polymorphic mixin class which can capture and store the current exception, making it possible to nest exceptions of arbitrary types within each other.

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Membri funzioni

(costruttore)	costruisce un nested_exception Original: constructs a nested_exception The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
(destructor) [virtuale]	distrugge una eccezione nidificata Original: destructs a nested exception The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico virtuale)
operator=	sostituisce il contenuto di un nested_exception Original: replaces the contents of a nested_exception The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
rethrow_nested	genera l'eccezione memorizzato Original: throws the stored exception The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
nested_ptr	ottiene un puntatore memorizzato l'eccezione Original: obtains a pointer to the stored exception The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)

Esempio

Dimostra costruzione e ricorsione attraverso un oggetto eccezione nidificata

Original:

Demonstrates construction and recursion through a nested exception object

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#include <iostream>#include <stdexcept>#include <exception>#include <string>#include <fstream>   // prints the explanatory string of an exception. If the exception is nested,// recurses to print the explanatory of the exception it holdsvoid print_exception(conststd::exception& e, int level =0){std::cerr<<std::string(level, ' ')<<"exception: "<< e.what()<<'\n';try{std::rethrow_if_nested(e);}catch(conststd::exception& e){ print_exception(e, level+1);}catch(...){}}   // sample function that catches an exception and wraps it in a nested exceptionvoid open_file(conststd::string& s){try{std::ifstream file(s); file.exceptions(std::ios_base::failbit);}catch(...){std::throw_with_nested(std::runtime_error("Couldn't open "+ s));}}   // sample function that catches an exception and wraps it in a nested exceptionvoid run(){try{ open_file("nonexistent.file");}catch(...){std::throw_with_nested(std::runtime_error("run() failed"));}}   // runs the sample function above and prints the caught exceptionint main(){try{ run();}catch(conststd::exception& e){ print_exception(e);}}

Output:

exception: run() failed exception: Couldn't open nonexistent.file exception: basic_ios::clear

Vedi anche

exception_ptr (C++11)	puntatore di tipo comune per la gestione di oggetti eccezione Original: shared pointer type for handling exception objects The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (typedef)