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std::nested_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
(C++11)
Operadores relacionales
Original:
Relational operators
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Pares y tuplas
Original:
Pairs and tuples
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(C++11)
Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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(C++11)
(C++11)
(C++11)
 
Gestión de errores
Manejo de excepciones
Original:
Exception handling
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nested_exception
(C++11)
Fallas de control de excepciones
Original:
Exception handling failures
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(obsoleto)
(C++11)(obsoleto)
(obsoleto)
Categorías excepción
Original:
Exception categories
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Los códigos de error
Original:
Error codes
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Los códigos de error
Las afirmaciones
Original:
Assertions
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instalación SYSTEM_ERROR
Original:
system_error facility
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(C++11)
(C++11)
 
Definido en la cabecera <exception>
class nested_exception;
(desde C++11)
std::nested_exceptions es una clase mixin polimórfico que puede capturar y almacenar la excepción actual, por lo que es posible con las excepciones nido de tipos arbitrarios dentro de cada otro .
Original:
std::nested_exceptions is a polymorphic mixin class which can capture and store the current exception, making it possible to nest exceptions of arbitrary types within each other.
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[editar] Las funciones miembro

construye una nested_exception
Original:
constructs a nested_exception
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(función miembro público)
[virtual]
destructs una excepción anidada
Original:
destructs a nested exception
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(función miembro público virtual)
sustituye el contenido de un nested_exception
Original:
replaces the contents of a nested_exception
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(función miembro público)
produce la excepción almacenado
Original:
throws the stored exception
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(función miembro público)
obtiene un puntero a la excepción almacenado
Original:
obtains a pointer to the stored exception
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(función miembro público)

[editar] Ejemplo

[editar]

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);
    }
}

Salida:

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

[editar] Ver también

puntero compartido tipo para la manipulación de objetos de excepción
Original:
shared pointer type for handling exception objects
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(typedef) [editar]