std::system_category
De cppreference.com
| Definido en el archivo de encabezado <system_error>
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const std::error_category& system_category();
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(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.The text has been machine-translated via Google Translate.
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Parámetros
(Ninguno)
Original:
(none)
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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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Excepciones
Ejemplo
Ejecuta este código
#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
