Namespace
Varianti

std::system_category

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
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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 <system_error>
const std::error_category& system_category();
(dal C++11)
Ottiene un riferimento all'oggetto statico categoria di errore per gli errori segnalati dal sistema operativo. L'oggetto è necessario eseguire l'override della funzione virtuale error_category::name() per restituire un puntatore alla stringa "system". E 'anche necessario eseguire l'override della funzione virtuale error_category::default_error_condition() per mappare i codici di errore che corrispondono POSIX errno valori std::generic_category.
Original:
Obtains a reference to the static error category object for errors reported by the operating system. The object is required to override the virtual function error_category::name() to return a pointer to the string "system". It is also required to override the virtual function error_category::default_error_condition() to map the error codes that match POSIX errno values to std::generic_category.
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Indice

[modifica] Parametri

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

Un riferimento all'oggetto statico del tipo di runtime non specificato, derivato da std::error_category.
Original:
A reference to the static object of unspecified runtime type, derived from std::error_category.
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[modifica] Eccezioni

noexcept specification:  
noexcept
  (dal C++11)

[modifica] Esempio

#include <iostream>
#include <system_error>
#include <iomanip>
#include <string>
 
int main()
{
    std::error_condition econd = std::system_category().default_error_condition(EDOM);
    std::cout << "Category: " << econd.category().name() << '\n'
              << "Value: " << econd.value() << '\n'
              << "Message: " << econd.message() << '\n';
 
    econd = std::system_category().default_error_condition(10001);
    std::cout << "Category: " << econd.category().name() << '\n'
              << "Value: " << econd.value() << '\n'
              << "Message: " << econd.message() << '\n';
}

Output:

Category: generic
Value: 33
Message: Numerical argument out of domain
Category: system
Value: 10001
Message: Unknown error 10001

[modifica] Vedi anche

identifica la categoria di errore generico
Original:
identifies the generic error category
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(funzione) [edit]
(C++11)
l'enumerazione std::error_condition elenco di tutti gli standard <cerrno> costanti macro
Original:
the std::error_condition enumeration listing all standard <cerrno> macro constants
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(classe) [edit]