Namespace
Varianti

std::throw_with_nested

Da cppreference.com.
< cpp‎ | error

 
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
Gestione della memoria dinamica
La gestione degli errori
Programma di utilità
Funzioni variadic
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)
 
Defined in header <exception>
template< class T >
[[noreturn]] void throw_with_nested( T&& t );
(dal C++11)
Genera un'eccezione di tipo non specificato, che deriva sia da std::nested_exception e da std::remove_reference<T>::type, e costruito da std::forward<T>(t). Il costruttore di default del genitore nested_exception chiama std::current_exception, catturando l'oggetto eccezione attualmente gestita, se del caso, in std::exception_ptr.
Original:
Throws an exception of unspecified type that is derived from both std::nested_exception and from std::remove_reference<T>::type, and constructed from std::forward<T>(t). The default constructor of the nested_exception parent calls std::current_exception, capturing the currently handled exception object, if any, in std::exception_ptr.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Se std::remove_reference<T>::type è già derivato da std::nested_exception, lancia semplicemente std::forward<T>(t).
Original:
If std::remove_reference<T>::type is already derived from std::nested_exception, simply throws std::forward<T>(t).
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Richiede che std::remove_reference<T>::type è CopyConstructible
Original:
Requires that std::remove_reference<T>::type is CopyConstructible
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Indice

[modifica] Parametri

t -
l'oggetto di un'eccezione da generare
Original:
the exception object to throw
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifica] Valore di ritorno

(Nessuno)
Original:
(none)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifica] Esempio

[edit]

Dimostra costruzione e ricorsione attraverso un oggetto eccezione nidificata
Original:
Demonstrates construction and recursion through a nested exception object
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#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 holds
void print_exception(const std::exception& e, int level =  0)
{
    std::cerr << std::string(level, ' ') << "exception: " << e.what() << '\n';
    try {
        std::rethrow_if_nested(e);
    } catch(const std::exception& e) {
        print_exception(e, level+1);
    } catch(...) {}
}
 
// sample function that catches an exception and wraps it in a nested exception
void open_file(const std::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 exception
void 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 exception
int main()
{
    try {
        run();
    } catch(const std::exception& e) {
        print_exception(e);
    }
}

Output:

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

[modifica] Vedi anche

un tipo mixin per acquisire e memorizzare le eccezioni attuali
Original:
a mixin type to capture and store current exceptions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(classe) [edit]
genera l'eccezione di un std::nested_exception
Original:
throws the exception from a std::nested_exception
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(funzione di modello) [edit]