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std::system_category

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< cpp‎ | error

 
 
 
Erreur de manipulation
La gestion des exceptions
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)
Défaillances de gestion des exceptions
Original:
Exception handling failures
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terminate
terminate_handler
get_terminate (C++11)
set_terminate
unexpected (obsolète)
bad_exception
unexpected_handler (obsolète)
get_unexpected (C++11) (obsolète)
set_unexpected (obsolète)
Catégories d'exception
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
Les codes d'erreur
Original:
Error codes
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Les codes d'erreur
errno
Les assertions
Original:
Assertions
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assert
system_error installation
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();
(depuis C++11)
Obtient une référence à l'objet de classe d'erreur statique pour des erreurs signalées par le système d'exploitation. L'objet est nécessaire pour annuler la error_category::name() fonction virtuelle de retourner un pointeur sur la chaîne de "system". Il est également nécessaire de remplacer la fonction virtuelle error_category::default_error_condition() pour mapper les codes d'erreur POSIX ce match errno valeurs à 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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Sommaire

[modifier] Paramètres

(Aucun)
Original:
(none)
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[modifier] Retourne la valeur

Une référence à l'objet statique de type à l'exécution indéterminée, dérivé de std::error_category .
Original:
A reference to the static object of unspecified runtime type, derived from std::error_category.
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[modifier] Exceptions

noexcept specification:  
noexcept
   (depuis C++11)

[modifier] Exemple

#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';
}

Résultat :

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

[modifier] Voir aussi

identifie la catégorie d'erreur générique
Original:
identifies the generic error category
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(fonction) [edit]
(C++11)
l'énumération std::error_condition liste de tous les standards <cerrno> constantes macro
Original:
the std::error_condition enumeration listing all standard <cerrno> macro constants
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(classe) [edit]