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std::iostream_category

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< cpp‎ | io

 
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
Original:
Streams
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Abstrações
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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
Cordas I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
Original:
Array I/O
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istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
Tipos
Original:
Types
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streamoff
streamsize
fpos
Interface de categoria de erro
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Defined in header <ios>
const std::error_category& iostream_category();
(a partir do C++ 11)
Obtém uma referência para o objeto estático erro categoria para erros iostream. O objeto é necessária para substituir o error_category::name() função virtual para retornar um ponteiro para a "iostream" string. Ele é utilizado para identificar os códigos de erro fornecidos nas excepções de 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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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
  (a partir do C++ 11)

[editar] Exemplo

#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

[editar] Veja também

exceção fluxo
Original:
stream exception
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(of std::ios_base public class membro) [edit]
(C++11)
O erro de IO códigos de fluxo
Original:
the IO stream error codes
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(enum) [edit]