Use throw_with_nested and catch nested exception

Question

I really like std::throw_with_nested in c++11 since it emulates java\'s printStackTrace() but right now I am just curious how to catch a nested exception, for example:

Answer 1

Unwrapping a std::nested_exception is readily accomplished via recursion:

template<typename E>
void rethrow_unwrapped(const E& e)
{
    try {
        std::rethrow_if_nested(e);
    } catch(const std::nested_exception& e) {
        rethrow_unwrapped(e);
    } catch(...) {
        throw;
    }
}

Where usage would look something like this:

try {
    throws();
} catch(const std::exception& e) {
    try {
        rethrow_unwrapped(e);
    } catch (const SomeException& e) {
        // do something
    }
}

A demo of this in action can be found here.