Varianti

    std::iostream_category

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    <metanoindex/>

     
    C++
     
    Ingresso / libreria di output
    I / O manipolatori
    C-style I / O
    Buffer
    Original:
    Buffers
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    basic_streambuf
    basic_filebuf
    basic_stringbuf
    strstreambuf(deprecato)
    Streams
    Original:
    Streams
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    Astrazioni
    Original:
    Abstractions
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    ios_base
    basic_ios
    basic_istream
    basic_ostream
    basic_iostream
    File I / O
    Original:
    File I/O
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    basic_ifstream
    basic_ofstream
    basic_fstream
    String I / O
    Original:
    String I/O
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    basic_istringstream
    basic_ostringstream
    basic_stringstream
    Array I / O
    Original:
    Array I/O
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    istrstream(deprecato)
    ostrstream(deprecato)
    strstream(deprecato)
    Tipi
    Original:
    Types
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    streamoff
    streamsize
    fpos
    Errore categoria interfaccia
    Original:
    Error category interface
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    iostream_category(C++11)
    io_errc(C++11)
     
    <tbody> </tbody>
    Elemento definito nell'header <ios>
    const std::error_category& iostream_category();
    		 (dal C++11)
    Ottiene un riferimento all'oggetto statico categoria degli errori di iostream. L'oggetto è necessario eseguire l'override della funzione virtuale error_category::name() per restituire un puntatore alla stringa "iostream". Viene utilizzato per identificare i codici di errore previsti nelle eccezioni di cui std::ios_base::failure tipo.
    Original:
    Obtains a reference to the static error category object for iostream errors. The object is required to override the virtual function error_category::name() to return a pointer to the string "iostream". It is used to identify error codes provided in the exceptions of type std::ios_base::failure.
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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 <fstream>

int main()
{
    std::ifstream f("doesn't exist");
    try {
        f.exceptions(f.failbit);
    } catch (const std::ios_base::failure& e) {
        std::cout << "Caught an ios_base::failure.\n"
                  << "Error category: " << e.code().category().name() << '\n';
    }
}

    Output: 

    Caught an ios_base::failure.
Error category: iostream

    Vedi anche
    flusso di eccezione
    Original:
    stream exception
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    (membro pubblico of std::ios_base classe) [modifica]
    (C++11)
    il flusso IO codici di errore
    Original:
    the IO stream error codes
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    (enum) [modifica]