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      std::generic_category

      De cppreference.com

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      rel_ops::operator!=
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      Categorias de exceção
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      <tbody> </tbody>
      Definido no cabeçalho <system_error>
      const std::error_category& generic_category();
      		 (desde C++11)
      Obtém uma referência para o objeto estático erro categoria para erros genéricos. O objeto é necessária para substituir o error_category::name() função virtual para retornar um ponteiro para a "generic" string. Ele é utilizado para identificar as condições de erro, que correspondem aos códigos POSIX errno.
      Original:
      Obtains a reference to the static error category object for generic errors. The object is required to override the virtual function error_category::name() to return a pointer to the string "generic". It is used to identify error conditions that correspond to the POSIX errno codes.
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      Parâmetros

      (Nenhum)
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      (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

      noexcept specification:  
      <tbody> </tbody>
      noexcept
        (desde C++11)

      Exemplo

      #include <iostream>
#include <system_error>
#include <cerrno>
#include <string>
int main()
{
    std::error_condition econd = std::generic_category().default_error_condition(EDOM);
    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

      Veja também

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