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std::rethrow_if_nested

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< cpp‎ | error

 
 
 
Erreur de manipulation
La gestion des exceptions
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)
Défaillances de gestion des exceptions
Original:
Exception handling failures
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terminate
terminate_handler
get_terminate (C++11)
set_terminate
unexpected (obsolète)
bad_exception
unexpected_handler (obsolète)
get_unexpected (C++11) (obsolète)
set_unexpected (obsolète)
Catégories d'exception
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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
Les codes d'erreur
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Error codes
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Les codes d'erreur
errno
Les assertions
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Assertions
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assert
system_error installation
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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)
 
Defined in header <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<const std::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<const std::nested_exception&>(e).rethrow_nested(). Otherwise, does nothing.
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Sommaire

[modifier] Paramètres

e -
l'objet exception à réémettre
Original:
the exception object to rethrow
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[modifier] Retourne la valeur

(Aucun)
Original:
(none)
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[modifier] Exemple

[edit]

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 holds
void print_exception(const std::exception& e, int level =  0)
{
    std::cerr << std::string(level, ' ') << "exception: " << e.what() << '\n';
    try {
        std::rethrow_if_nested(e);
    } catch(const std::exception& e) {
        print_exception(e, level+1);
    } catch(...) {}
}
 
// sample function that catches an exception and wraps it in a nested exception
void open_file(const std::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 exception
void 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 exception
int main()
{
    try {
        run();
    } catch(const std::exception& e) {
        print_exception(e);
    }
}

Résultat :

exception: run() failed
 exception: Couldn't open nonexistent.file
  exception: basic_ios::clear

[modifier] Voir aussi

un type mixin pour capturer et stocker les exceptions actuelles
Original:
a mixin type to capture and store current exceptions
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(classe) [edit]
jette sa dispute avec std::nested_exception mixtes po
Original:
throws its argument with std::nested_exception mixed in
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(fonction générique) [edit]