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std::system_category

De cppreference.com
< cpp‎ | error
 
 
Utilidades de la biblioteca
Escriba apoyo (basic types, RTTI, type traits)
Gestión de memoria dinámica
Gestión de errores
Programa de servicios públicos
Funciones variadic
Fecha y hora
Objetos Function
(C++11)
Operadores relacionales
Original:
Relational operators
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Pares y tuplas
Original:
Pairs and tuples
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(C++11)
Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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(C++11)
(C++11)
(C++11)
 
Gestión de errores
Manejo de excepciones
Original:
Exception handling
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Fallas de control de excepciones
Original:
Exception handling failures
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(obsoleto)
(C++11)(obsoleto)
(obsoleto)
Categorías excepción
Original:
Exception categories
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Los códigos de error
Original:
Error codes
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Los códigos de error
Las afirmaciones
Original:
Assertions
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instalación SYSTEM_ERROR
Original:
system_error facility
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system_category
(C++11)
(C++11)
(C++11)
 
Definido en la cabecera <system_error>
const std::error_category& system_category();
(desde C++11)
Obtiene una referencia al objeto de error de categoría estática de los errores reportados por el sistema operativo. El objeto es necesaria para anular el error_category::name() función virtual para devolver un puntero a la cadena "system". También es necesario reemplazar la función virtual error_category::default_error_condition() para asignar los códigos de error que encuentro POSIX errno valores a 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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Contenido

[editar] Parámetros

(Ninguno)
Original:
(none)
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[editar] Valor de retorno

Una referencia al objeto estático de tipo no especificado de tiempo de ejecución, derivado de std::error_category .
Original:
A reference to the static object of unspecified runtime type, derived from std::error_category.
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[editar] Excepciones

noexcept specification:  
noexcept
  (desde C++11)

[editar] Ejemplo

#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';
}

Salida:

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

[editar] Ver también

identifica la categoría de error genérico
Original:
identifies the generic error category
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(función) [editar]
(C++11)
la enumeración std::error_condition lista de todos los estándares <cerrno> constantes macro
Original:
the std::error_condition enumeration listing all standard <cerrno> macro constants
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(clase) [editar]