std::exception_ptr
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definiert in Header <exception> | ||
typedef/*unspecified*/ exception_ptr; | (seit C++11) | |
std::exception_ptr ist ein NULL-Zeiger-wie Typ, der eine Ausnahme Objekt, das geworfen wurde und eroberte mit std::current_exception verwaltet. Eine Instanz std::exception_ptr kann eine andere Funktion übergeben werden, möglicherweise auf einem anderen Thread, wo die Ausnahme kann erneut ausgelöst und behandelt werden mit einer catch-Klausel .Original:
std::exception_ptr is a nullable pointer-like type that manages an exception object which has been thrown and captured with std::current_exception. An instance of std::exception_ptr may be passed to another function, possibly on another thread, where the exception may be rethrown and handled with a catch clause.The text has been machine-translated via Google Translate.
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Default-gebaut
std::exception_ptr wird ein NULL-Zeiger, ist es nicht zu einer Ausnahme Objekt zeigen .Original:
Default-constructed
std::exception_ptr is a null pointer, it does not point to an exception object.The text has been machine-translated via Google Translate.
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Zwei Instanzen
std::exception_ptr sind gleich, wenn sie beide null oder beide auf gleicher Exception-Objekt sind .Original:
Two instances of
std::exception_ptr compare equal only if they are both null or both point at the same exception object.The text has been machine-translated via Google Translate.
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std::exception_ptr weder implizit konvertierbar beliebigen arithmetischen, Enumeration oder Zeigertyp. Es ist konvertierbar bool .Original:
std::exception_ptr is not implicitly convertible to any arithmetic, enumeration, or pointer type. It is convertible to bool.The text has been machine-translated via Google Translate.
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Das Exception-Objekt von einem
std::exception_ptr verwiesen wird, bleibt so lange gültig, wie es bleibt mindestens ein std::exception_ptr, die darauf verweisen wird: std::exception_ptr ist ein Shared-Ownership Smart-Pointer .Original:
The exception object referenced by an
std::exception_ptr remains valid as long as there remains at least one std::exception_ptr that is referencing it: std::exception_ptr is a shared-ownership smart pointer.The text has been machine-translated via Google Translate.
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[Bearbeiten]Beispiel
#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(conststd::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) | schafft eine std::exception_ptr von einer Ausnahme-Objekt Original: creates an std::exception_ptr from an exception object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template) |
(C++11) | captures the current exception in a std::exception_ptr (Funktion) |
(C++11) | wirft die Ausnahme von einem std::exception_ptr Original: throws the exception from an std::exception_ptr The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) |
