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std::current_exception

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C++
 
Utilities-Bibliothek
 
Fehlerbehandlung
Exception Handling
Original:
Exception handling
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exception
uncaught_exception
exception_ptr(C++11)
make_exception_ptr(C++11)
current_exception(C++11)
rethrow_exception(C++11)
nested_exception(C++11)
throw_with_nested(C++11)
rethrow_if_nested(C++11)
Ausnahmebehandlung Ausfälle
Original:
Exception handling failures
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terminate
terminate_handler
get_terminate(C++11)
set_terminate
unexpected(veraltet)
bad_exception
unexpected_handler(veraltet)
get_unexpected(C++11)(veraltet)
set_unexpected(veraltet)
Exception Kategorien
Original:
Exception categories
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logic_error
invalid_argument
domain_error
length_error
out_of_range
runtime_error
range_error
overflow_error
underflow_error
Fehlercodes
Original:
Error codes
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Fehlercodes
errno
Assertions
Original:
Assertions
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assert
system_error Anlage
Original:
system_error facility
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error_category(C++11)
generic_category(C++11)
system_category(C++11)
error_condition(C++11)
errc(C++11)
error_code(C++11)
system_error(C++11)
 
definiert in Header <exception>
std::exception_ptr current_exception()
 (seit C++11)
Wenn während der Ausnahmebehandlung (in der Regel in einem catch Klausel) genannt wird, erfasst die aktuelle Ausnahme Objekt und erstellt eine std::exception_ptr, die einen Verweis hält an dieser Ausnahme-Objekt oder auf eine Kopie dieser Ausnahme-Objekt (es ist die Implementierung definiert, wenn eine Kopie ist hergestellt)
Original:
If called during exception handling (typically, in a catch clause), captures the current exception object and creates an std::exception_ptr that holds a reference to that exception object, or to a copy of that exception object (it is implementation-defined if a copy is made)
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Wenn die Implementierung dieser Funktion erfordert einen Aufruf new und der Aufruf fehlschlägt, wird der zurückgegebene Zeiger einen Verweis auf eine Instanz std::bad_alloc
Original:
If the implementation of this function requires a call to new and the call fails, the returned pointer will hold a reference to an instance of std::bad_alloc
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Wenn die Implementierung dieser Funktion benötigt, um das aufgenommene Ausnahme-Objekt kopieren und die Kopie Konstruktor eine Ausnahme auslöst, wird die zurückgegebene Zeiger einen Verweis auf die Ausnahme ausgelöst. Wenn die Kopie Konstruktor des geworfenen Exception-Objekt wirft auch, kann die zurückgegebene Zeiger einen Verweis auf eine Instanz std::bad_exception um die Endlosschleife zu brechen .
Original:
If the implementation of this function requires to copy the captured exception object and its copy constructor throws an exception, the returned pointer will hold a reference to the exception thrown. If the copy constructor of the thrown exception object also throws, the returned pointer may hold a reference to an instance of std::bad_exception to break the endless loop.
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Wenn die Funktion aufgerufen wird, wenn keine Ausnahme gehandhabt wird, wird ein leerer std::exception_ptr zurückgegeben .
Original:
If the function is called when no exception is being handled, an empty std::exception_ptr is returned.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

(None)
Original:
(none)
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[Bearbeiten] Rückgabewert

Eine Instanz std::exception_ptr hält einen Verweis auf die Ausnahme-Objekt oder eine Kopie des Exception-Objekt oder auf eine Instanz std::bad_alloc oder zu einer Instanz von std::bad_exception .
Original:
An instance of std::exception_ptr holding a reference to the exception object, or a copy of the exception object, or to an instance of std::bad_alloc or to an instance of std::bad_exception.
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[Bearbeiten] Ausnahmen

noexcept specification:  
noexcept
  (seit C++11)

[Bearbeiten] Beispiel

[edit]
#include <iostream>
#include <string>
#include <exception>
#include <stdexcept>
 
void handle_eptr(std::exception_ptr eptr) // passing by value is ok
{
    try {
        if (eptr != std::exception_ptr()) {
            std::rethrow_exception(eptr);
        }
    } catch(const std::exception& e) {
        std::cout << "Caught exception \"" << e.what() << "\"\n";
    }
}
 
int main()
{
    std::exception_ptr eptr;
    try {
        std::string().at(1); // this generates an std::out_of_range
    } catch(...) {
        eptr = std::current_exception(); // capture
    }
    handle_eptr(eptr);
} // destructor for std::out_of_range called here, when the eptr is destructed

Output: 

Caught exception "basic_string::at"

[Bearbeiten] Siehe auch

(C++11)
teilte Zeigertyp für den Umgang mit Exception-Objekte
Original:
shared pointer type for handling exception objects
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(typedef) [edit]
(C++11)
wirft die Ausnahme von einem std::exception_ptr
Original:
throws the exception from an std::exception_ptr
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(Funktion) [edit]
(C++11)
schafft eine std::exception_ptr von einer Ausnahme-Objekt
Original:
creates an std::exception_ptr from an exception object
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(Funktions-Template) [edit]
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