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std::uncaught_exception

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< cpp‎ | error

 
 
Utilidades de la biblioteca
Escriba apoyo (basic types, RTTI, type traits)
Gestión de memoria dinámica
Gestión de errores
Programa de servicios públicos
Funciones variadic
Fecha y hora
Objetos Function
initializer_list(C++11)
bitset
hash(C++11)
Operadores relacionales
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares y tuplas
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
Gestión de errores
Manejo de excepciones
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)
Fallas de control de excepciones
Original:
Exception handling failures
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terminate
terminate_handler
get_terminate(C++11)
set_terminate
unexpected(obsoleto)
bad_exception
unexpected_handler(obsoleto)
get_unexpected(C++11)(obsoleto)
set_unexpected(obsoleto)
Categorías excepción
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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
Los códigos de error
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Error codes
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Los códigos de error
errno
Las afirmaciones
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Assertions
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assert
instalación SYSTEM_ERROR
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)
 
Defined in header <exception>
bool uncaught_exception();
Detecta si el subproceso actual tiene un objeto de excepción en vivo, es decir, ha sido una excepción y no ha entrado una cláusula catch coincidente, std::terminate o std::unexpected. En otras palabras, std::uncaught_exception detecta si desenredo de pila está en curso .
Original:
Detects if the current thread has a live exception object, that is, an exception has been thrown and not yet entered a matching catch clause, std::terminate or std::unexpected. In other words, std::uncaught_exception detects if stack unwinding is currently in progress.
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A veces es más seguro para producir una excepción, incluso mientras std::uncaught_exception() == true. Por ejemplo, si las excepciones son capturadas e ignorados en un destructor, que no se puede propagar fuera de él y no dará lugar a std::terminate .
Original:
Sometimes it's safe to throw an exception even while std::uncaught_exception() == true. For example, if exceptions are caught and ignored in a destructor, they can't propagate out of it and won't lead to std::terminate.
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Contenido

[editar] Parámetros

(Ninguno)
Original:
(none)
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[editar] Valor de retorno

true si desenredo de pila está actualmente en curso en este hilo .
Original:
true if stack unwinding is currently in progress in this thread.
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[editar] Excepciones

noexcept specification:  
noexcept
  (desde C++11)

[editar] Ejemplo

#include <iostream>
#include <exception>
#include <stdexcept>
 
struct Foo {
    ~Foo() {
        if (std::uncaught_exception()) {
            std::cout << "~Foo() called during stack unwinding\n";
        } else {
            std::cout << "~Foo() called normally\n";
        }
    }
};
int main()
{
    Foo f;
    try {
        Foo f;
        std::cout << "Exception thrown\n";
        throw std::runtime_error("test exception");
    } catch (const std::exception& e) {
        std::cout << "Exception caught: " << e.what() << '\n';
    }
}

Output:

Exception thrown
~Foo() called during stack unwinding
Exception caught: test exception
~Foo() called normally

[editar] Ver también

función llamada cuando falla el control de excepciones
Original:
function called when exception handling fails
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(función) [edit]
puntero compartido tipo para la manipulación de objetos de excepción
Original:
shared pointer type for handling exception objects
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(typedef) [edit]

[editar] Enlaces externos

GOTW issue 47: Uncaught Exceptions