std::system_category
Aus cppreference.com
 |
This page has been machine-translated from the English version of the wiki using Google Translate.
The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here. |
| definiert in Header <system_error>
|
||
| const std::error_category& system_category(); |
(seit C++11) | |
Erhält einen Hinweis auf die statische Fehlerkategorie Objekt für Fehler, die durch das Betriebssystem gemeldet. Das Objekt ist erforderlich, um die virtuelle Funktion error_category::name() überschreiben, um einen Zeiger auf den String "system" zurückzukehren. Es ist auch erforderlich, um die virtuelle Funktion error_category::default_error_condition() überschreiben, um die Fehlercodes zuordnen, Spiel POSIX errno Werte 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.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Inhaltsverzeichnis |
[Bearbeiten] Parameter
(None)
Original:
(none)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[Bearbeiten] Rückgabewert
Ein Verweis auf den statischen Objekt unbestimmter Laufzeit-Typ, von std::error_category abgeleitet .
Original:
A reference to the static object of unspecified runtime type, derived from std::error_category.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[Bearbeiten] Ausnahmen
[Bearbeiten] Beispiel
#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
[Bearbeiten] Siehe auch
| (C++11) |
identifiziert die generische Fehler Kategorie Original: identifies the generic error category The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) |
| (C++11) |
Die std::error_condition Aufzählung listet alle gängigen <cerrno> Makro-KonstantenOriginal: the std::error_condition enumeration listing all standard <cerrno> macro constantsThe text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klasse) |
