Varianti

    std::system_category

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    <metanoindex/>

     
    C++
     
    Utilità libreria
    Tipo di supporto (basic types, RTTI, type traits)
    Gestione della memoria dinamica
    La gestione degli errori
    Programma di utilità
    Funzioni variadic
    Data e ora
    Funzione oggetti
    initializer_list(C++11)
    bitset
    hash(C++11)
    Gli operatori relazionali
    Original:
    Relational operators
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    rel_ops::operator!=
    rel_ops::operator>
    rel_ops::operator<=
    rel_ops::operator>=
    Coppie e tuple
    Original:
    Pairs and tuples
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    pair
    tuple(C++11)
    piecewise_construct_t(C++11)
    piecewise_construct(C++11)
    Swap, in avanti e spostare
    Original:
    Swap, forward and move
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    swap
    forward(C++11)
    move(C++11)
    move_if_noexcept(C++11)
    declval(C++11)
     
    La gestione degli errori
    Gestione delle eccezioni
    Original:
    Exception handling
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    exception
    uncaught_exception
    exception_ptr(C++11)
    make_exception_ptr(C++11)
    current_exception(C++11)
    rethrow_exception(C++11)
    nested_exception(C++11)
    throw_with_nested(C++11)
    rethrow_if_nested(C++11)
    Gestione delle eccezioni fallimenti
    Original:
    Exception handling failures
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    terminate
    terminate_handler
    get_terminate(C++11)
    set_terminate
    unexpected(deprecato)
    bad_exception
    unexpected_handler(deprecato)
    get_unexpected(C++11)(deprecato)
    set_unexpected(deprecato)
    Eccezione categorie
    Original:
    Exception categories
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    logic_error
    invalid_argument
    domain_error
    length_error
    out_of_range
    runtime_error
    range_error
    overflow_error
    underflow_error
    Codici di errore
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    Error codes
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    Codici di errore
    errno
    Asserzioni
    Original:
    Assertions
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    assert
    impianto system_error
    Original:
    system_error facility
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    error_category(C++11)
    generic_category(C++11)
    system_category(C++11)
    error_condition(C++11)
    errc(C++11)
    error_code(C++11)
    system_error(C++11)
     
    <tbody> </tbody>
    Elemento definito nell'header <system_error>
    const std::error_category& system_category();
    		 (dal C++11)
    Ottiene un riferimento all'oggetto statico categoria di errore per gli errori segnalati dal sistema operativo. L'oggetto è necessario eseguire l'override della funzione virtuale error_category::name() per restituire un puntatore alla stringa "system". E 'anche necessario eseguire l'override della funzione virtuale error_category::default_error_condition() per mappare i codici di errore che corrispondono POSIX errno valori 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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    Parametri

    (Nessuno)
    Original:
    (none)
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    Valore di ritorno

    Un riferimento all'oggetto statico del tipo di runtime non specificato, derivato da std::error_category.
    Original:
    A reference to the static object of unspecified runtime type, derived from std::error_category.
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    Eccezioni

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

    Esempio

    #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';
}

    Output: 

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

    Vedi anche

    (C++11)
    identifica la categoria di errore generico
    Original:
    identifies the generic error category
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    (funzione) [modifica]
    (C++11)
    l'enumerazione std::error_condition elenco di tutti gli standard <cerrno> costanti macro
    Original:
    the std::error_condition enumeration listing all standard <cerrno> macro constants
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    (classe) [modifica]