std::rethrow_if_nested
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Déclaré dans l'en-tête <exception> | ||
template<class E > void rethrow_if_nested(const E& e ); | (depuis C++11) | |
Si
E est un type qui est extraite de std::nested_exception sans ambiguïté, extraits et lève l'exception imbriquée comme en appelant dynamic_cast<conststd::nested_exception&>(e).rethrow_nested(). Dans le cas contraire, ne fait rien .Original:
If
E is a type that is unambiguously derived from std::nested_exception, extracts and throws the nested exception as if by calling dynamic_cast<conststd::nested_exception&>(e).rethrow_nested(). Otherwise, does nothing.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Sommaire |
[modifier]Paramètres
| e | - | l'objet exception à réémettre Original: the exception object to rethrow The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[modifier]Retourne la valeur
(Aucun)
Original:
(none)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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[modifier]Exemple
Démontre la construction et la récursivité à travers un objet d'exception imbriquée
Original:
Demonstrates construction and recursion through a nested exception object
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#include <iostream>#include <stdexcept>#include <exception>#include <string>#include <fstream> // prints the explanatory string of an exception. If the exception is nested,// recurses to print the explanatory of the exception it holdsvoid print_exception(conststd::exception& e, int level =0){std::cerr<<std::string(level, ' ')<<"exception: "<< e.what()<<'\n';try{ std::rethrow_if_nested(e);}catch(conststd::exception& e){ print_exception(e, level+1);}catch(...){}} // sample function that catches an exception and wraps it in a nested exceptionvoid open_file(conststd::string& s){try{std::ifstream file(s); file.exceptions(std::ios_base::failbit);}catch(...){std::throw_with_nested(std::runtime_error("Couldn't open "+ s));}} // sample function that catches an exception and wraps it in a nested exceptionvoid run(){try{ open_file("nonexistent.file");}catch(...){std::throw_with_nested(std::runtime_error("run() failed"));}} // runs the sample function above and prints the caught exceptionint main(){try{ run();}catch(conststd::exception& e){ print_exception(e);}}
Résultat :
exception: run() failed exception: Couldn't open nonexistent.file exception: basic_ios::clear
[modifier]Voir aussi
(C++11) | un type mixin pour capturer et stocker les exceptions actuelles Original: a mixin type to capture and store current exceptions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe) |
(C++11) | jette sa dispute avec std::nested_exception mixtes po Original: throws its argument with std::nested_exception mixed in The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction générique) |
