std::rethrow_if_nested

 

C++

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Operadores relacionales Original: Relational operators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

Pares y tuplas Original: Pairs and tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

pair

tuple (C++11)

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Cambiar, hacia adelante y mover Original: Swap, forward and move The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap

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Manejo de excepciones Original: Exception handling The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

exception

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throw_with_nested (C++11)

rethrow_if_nested (C++11)

Fallas de control de excepciones Original: Exception handling failures 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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Categorías excepción Original: Exception categories The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

logic_error

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Los códigos de error

errno

Las afirmaciones Original: Assertions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

assert

instalación SYSTEM_ERROR Original: system_error facility 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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Defined in header <exception>
template< class E > void rethrow_if_nested( const E& e );		(desde C++11)

Si E es un tipo que se deriva de manera inequívoca std::nested_exception, extractos y produce la excepción anidada como si se aplicase dynamic_cast<const std::nested_exception&>(e).rethrow_nested(). De lo contrario, no hace nada .

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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Parámetros

e

-

el objeto de excepción para volver a lanzar 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.

Valor de retorno

(Ninguno)

Original:

(none)

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Ejemplo

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

Ver también

nested_exception (C++11)	un tipo mixin para capturar y almacenar las excepciones actuales 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. (clase)
throw_with_nested (C++11)	hace gala de su discusión con std::nested_exception mezclarla 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. (función de plantilla)