Namespace
Varianti

std::current_exception

Da cppreference.com.
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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
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Swap, in avanti e spostare
Original:
Swap, forward and move
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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
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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
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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
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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
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Codici di errore
errno
Asserzioni
Original:
Assertions
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assert
impianto system_error
Original:
system_error facility
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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>
std::exception_ptr current_exception()
(dal C++11)
Se viene chiamato durante la gestione delle eccezioni (in genere, in una clausola catch), cattura l'oggetto corrente eccezione e crea un std::exception_ptr che contiene un riferimento a tale oggetto di eccezione, o ad una copia di tale oggetto eccezione (è definito dall'implementazione se una copia è fatto)
Original:
If called during exception handling (typically, in a catch clause), captures the current exception object and creates an std::exception_ptr that holds a reference to that exception object, or to a copy of that exception object (it is implementation-defined if a copy is made)
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Se l'implementazione di questa funzione richiede una chiamata al new e la chiamata non riesce, il puntatore restituito terrà un riferimento a un'istanza di std::bad_alloc
Original:
If the implementation of this function requires a call to new and the call fails, the returned pointer will hold a reference to an instance of std::bad_alloc
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Se l'implementazione di questa funzione richiede di copiare l'oggetto eccezione catturato e la sua costruttore di copia genera un'eccezione, il puntatore restituito terrà un riferimento all'eccezione generata. Se il costruttore copia dell'oggetto eccezione generata tiri anche, il puntatore restituito può contenere un riferimento a un'istanza di std::bad_exception per interrompere il ciclo infinito.
Original:
If the implementation of this function requires to copy the captured exception object and its copy constructor throws an exception, the returned pointer will hold a reference to the exception thrown. If the copy constructor of the thrown exception object also throws, the returned pointer may hold a reference to an instance of std::bad_exception to break the endless loop.
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Se la funzione viene chiamata quando non fa eccezione viene gestita, un std::exception_ptr vuoto viene restituito.
Original:
If the function is called when no exception is being handled, an empty std::exception_ptr is returned.
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Indice

[modifica] Parametri

(Nessuno)
Original:
(none)
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[modifica] Valore di ritorno

Un'istanza di std::exception_ptr in possesso di un riferimento all'oggetto eccezione, o di una copia dell'oggetto eccezione, o di un'istanza di std::bad_alloc o un'istanza di std::bad_exception.
Original:
An instance of std::exception_ptr holding a reference to the exception object, or a copy of the exception object, or to an instance of std::bad_alloc or to an instance of std::bad_exception.
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[modifica] Eccezioni

noexcept specification:  
noexcept
  (dal C++11)

[modifica] Esempio

[edit]
#include <iostream>
#include <string>
#include <exception>
#include <stdexcept>
 
void handle_eptr(std::exception_ptr eptr) // passing by value is ok
{
    try {
        if (eptr != std::exception_ptr()) {
            std::rethrow_exception(eptr);
        }
    } catch(const std::exception& e) {
        std::cout << "Caught exception \"" << e.what() << "\"\n";
    }
}
 
int main()
{
    std::exception_ptr eptr;
    try {
        std::string().at(1); // this generates an std::out_of_range
    } catch(...) {
        eptr = std::current_exception(); // capture
    }
    handle_eptr(eptr);
} // destructor for std::out_of_range called here, when the eptr is destructed

Output:

Caught exception "basic_string::at"

[modifica] Vedi anche

puntatore di tipo comune per la gestione di oggetti eccezione
Original:
shared pointer type for handling exception objects
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(typedef) [edit]
genera l'eccezione da un std::exception_ptr
Original:
throws the exception from an std::exception_ptr
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(funzione) [edit]
crea un std::exception_ptr da un oggetto eccezione
Original:
creates an std::exception_ptr from an exception object
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(funzione di modello) [edit]