std::rethrow_if_nested

 

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Обработка исключений 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.

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nested_exception (C++11)

throw_with_nested (C++11)

rethrow_if_nested (C++11)

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logic_error

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Утверждений Original: Assertions 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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system_error центр 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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Заголовочный файл <exception>
template< class E > void rethrow_if_nested( const E& e );		(начиная с C++11)

Если E это тип, который однозначно происходит от std::nested_exception, экстракты и бросает вложенные исключения как при вызове dynamic_cast<const std::nested_exception&>(e).rethrow_nested(). В противном случае, ничего не делает.

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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Параметры

e

-

Исключение объекта вновь выбросить 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.

Возвращаемое значение

(Нет)

Original:

(none)

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Пример

Демонстрирует строительства и рекурсия через вложенный объект исключения

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);
    }
}

Вывод:

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

См. также

nested_exception (C++11)	Тип примесь для сбора и хранения текущей исключения 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. (класс)
throw_with_nested (C++11)	бросает свой спор с std::nested_exception ввязался 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. (шаблон функции)