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std::throw_with_nested

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< cpp‎ | error

 
 
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initializer_list(C++11)
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rel_ops::operator!=
rel_ops::operator>
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Pares y tuplas
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Pairs and tuples
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pair
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Cambiar, hacia adelante y mover
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Swap, forward and move
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Gestión de errores
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logic_error
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Los códigos de error
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Los códigos de error
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Las afirmaciones
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instalación SYSTEM_ERROR
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Defined in header <exception>
template< class T >
[[noreturn]] void throw_with_nested( T&& t );
(desde C++11)
Produce una excepción de tipo no especificado que se deriva tanto de std::nested_exception y de std::remove_reference<T>::type, y construida a partir de std::forward<T>(t). El constructor por defecto de los padres nested_exception llama std::current_exception, capturando el objeto de excepción actualmente a cargo, en su caso, en std::exception_ptr .
Original:
Throws an exception of unspecified type that is derived from both std::nested_exception and from std::remove_reference<T>::type, and constructed from std::forward<T>(t). The default constructor of the nested_exception parent calls std::current_exception, capturing the currently handled exception object, if any, in std::exception_ptr.
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Si std::remove_reference<T>::type ya está derivado de std::nested_exception, simplemente lanza std::forward<T>(t) .
Original:
If std::remove_reference<T>::type is already derived from std::nested_exception, simply throws std::forward<T>(t).
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Requiere que std::remove_reference<T>::type es CopyConstructible
Original:
Requires that std::remove_reference<T>::type is CopyConstructible
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Contenido

[editar] Parámetros

t -
el objeto de excepción para lanzar
Original:
the exception object to throw
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[editar] Valor de retorno

(Ninguno)
Original:
(none)
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[editar] Ejemplo

[edit]

Demuestra la construcción y la recursividad a través de un objeto de excepción anidada
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);
    }
}

Output:

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

[editar] Ver también

un tipo mixin para capturar y almacenar las excepciones actuales
Original:
a mixin type to capture and store current exceptions
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(clase) [edit]
produce la excepción de un std::nested_exception
Original:
throws the exception from a std::nested_exception
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(función de plantilla) [edit]