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std::is_error_code_enum<std::io_errc>

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< cpp‎ | io‎ | io errc

 
 
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
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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
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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)
 
std::io_errc
Classes auxiliares
Original:
Helper classes
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is_error_code_enum<std::io_errc>
Funções auxiliares
Original:
Helper functions
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make_error_code(std::io_errc)
make_error_condition(std::io_errc)
 
Defined in header <ios>
template< >
struct is_error_code_enum<std::io_errc> : public std::true_type { };
(a partir do C++ 11)
Esta especialização de std::is_error_code_enum informa que outros componentes da biblioteca valores do tipo std::io_errc são enumerações que detêm os códigos de erro, o que os torna implicitamente conversível e atribuído a objetos do tipo std::error_code.
Original:
This specialization of std::is_error_code_enum informs other library components that values of type std::io_errc are enumerations that hold error codes, which makes them implicitly convertible and assignable to objects of type std::error_code.
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Índice

Inherited from std::integral_constant

Member constants

value
[estática]
true
(membro estático público constante)

Member functions

operator bool
converte o objeto em bool, retorna value
Original:
converts the object to bool, returns value
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(função pública membro)

Member types

Tipo
Original:
Type
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Definition
value_type bool
type std::integral_constant<bool, value>

[editar] Exemplo

A comparação entre e.code() e std::io_errc::stream compila porque std::is_error_code_enum<std::io_errc>::value == true
Original:
The comparison between e.code() and std::io_errc::stream compiles because std::is_error_code_enum<std::io_errc>::value == true
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#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";
        if(e.code() == std::io_errc::stream)
            std::cout << "The error code is std::io_errc::stream\n";
    }
}

Output:

Caught an ios_base::failure.
The error code is std::io_errc::stream

[editar] Veja também

identifica uma classe como uma error_code controle de enumeração
Original:
identifies a class as an error_code enumeration
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(modelo de classe) [edit]
possui um código de erro depende da plataforma
Original:
holds a platform-dependent error code
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(classe) [edit]
(C++11)
O erro de IO códigos de fluxo
Original:
the IO stream error codes
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(enum) [edit]