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std::is_error_code_enum<std::io_errc>

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< cpp‎ | io‎ | io errc

 
 
Input / Output-Bibliothek
I / O-Manipulatoren
C-style I / O
Puffern
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(veraltet)
Streams
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Streams
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Abstraktionen
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Datei-I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
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Array I/O
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istrstream(veraltet)
ostrstream(veraltet)
strstream(veraltet)
Types
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Types
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streamoff
streamsize
fpos
Fehler Kategorie Schnittstelle
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::io_errc
Helper-Klassen
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Helper classes
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is_error_code_enum<std::io_errc>
Helper-Funktionen
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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 { };
(seit C++11)
Diese Spezialisierung std::is_error_code_enum informiert andere Bibliothek-Komponenten, die Werte vom Typ std::io_errc Enumerationen, Fehlercodes, die sie implizit konvertierbar und zuweisbar auf Objekte vom Typ macht halten sind 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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Inhaltsverzeichnis

Inherited from std::integral_constant

Member constants

value
[statisch]
true
(public static Mitglied konstanten)

Member functions

operator bool
wandelt das Objekt bool, gibt value
Original:
converts the object to bool, returns value
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(öffentliche Elementfunktion)

Member types

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

[Bearbeiten] Beispiel

Der Vergleich zwischen e.code() und std::io_errc::stream kompiliert, weil 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

[Bearbeiten] Siehe auch

kennzeichnet eine Klasse als error_code Enumeration
Original:
identifies a class as an error_code enumeration
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(Klassen-Template) [edit]
hält einen plattformabhängigen Fehlercode
Original:
holds a platform-dependent error code
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(Klasse) [edit]
(C++11)
die IO-Stream Fehlercodes
Original:
the IO stream error codes
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(enum) [edit]