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std::nested_exception

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Fehlerbehandlung
Exception Handling
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)
Ausnahmebehandlung Ausfälle
Original:
Exception handling failures
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terminate
terminate_handler
get_terminate(C++11)
set_terminate
unexpected(veraltet)
bad_exception
unexpected_handler(veraltet)
get_unexpected(C++11)(veraltet)
set_unexpected(veraltet)
Exception Kategorien
Original:
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
Fehlercodes
Original:
Error codes
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Fehlercodes
errno
Assertions
Original:
Assertions
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assert
system_error Anlage
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>
class nested_exception;
(seit C++11)
std::nested_exceptions ist eine polymorphe mixin Klasse, zu erfassen und speichern kann die aktuelle Ausnahme, wodurch es möglich zu verschachteln Ausnahmen beliebiger Typen ineinander .
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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[Bearbeiten] Member-Funktionen

konstruiert eine nested_exception
Original:
constructs a nested_exception
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(öffentliche Elementfunktion)
[virtuell]
zerstört sich eine verschachtelte Ausnahme
Original:
destructs a nested exception
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(virtuellen öffentlichen Member-Funktion)
ersetzt den Inhalt eines nested_exception
Original:
replaces the contents of a nested_exception
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(öffentliche Elementfunktion)
wirft den gespeicherten Ausnahme
Original:
throws the stored exception
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(öffentliche Elementfunktion)
erhält einen Zeiger zu der gespeicherten Ausnahme
Original:
obtains a pointer to the stored exception
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(öffentliche Elementfunktion)

[Bearbeiten] Beispiel

[edit]

Demonstriert, Bau und Rekursion durch eine verschachtelte Exception-Objekt
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

[Bearbeiten] Siehe auch

teilte Zeigertyp für den Umgang mit Exception-Objekte
Original:
shared pointer type for handling exception objects
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(typedef) [edit]