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std::system_category

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instalação system_error
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system_category
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Definido no cabeçalho <system_error>
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.
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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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Índice

[editar] Parâmetros

(Nenhum)
Original:
(none)
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[editar] 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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[editar] Exceções

noexcept specification:  
noexcept
  (desde C++11)

[editar] 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

[editar] Veja também

(C++11)
identifica a categoria de erro genérico
Original:
identifies the generic error category
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(função) [edit]
(C++11)
enumeração std::error_condition listando todos os padrões <cerrno> constantes macro
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the std::error_condition enumeration listing all standard <cerrno> macro constants
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(classe) [edit]
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