std::system_category
De cppreference.com
<metanoindex/>
<tbody> </tbody>| Definido no cabeçalho <system_error>
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const std::error_category& system_category(); |
(desde C++11) | |
Obtém uma referência para o objeto estático erro categoria para erros relatados pelo sistema operacional. O objeto é necessária para substituir o
error_category::name() função virtual para retornar um ponteiro para a "system" string. Também é necessária para substituir o error_category::default_error_condition() função virtual para mapear os códigos de erro que jogo POSIX errno valores para 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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Parâmetros
(Nenhum)
Original:
(none)
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Valor de retorno
Uma referência ao objeto estático do tipo não especificado de tempo de execução, 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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Exceções
Exemplo
#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';
}
Saída:
Category: generic
Value: 33
Message: Numerical argument out of domain
Category: system
Value: 10001
Message: Unknown error 10001