__declspec(noreturn)

Hi!

I have a utility function that composes an error message and throws a
std::runtime_error with it:

void throw_error( char const* str)
{
std::string msg;
msg += "my tool:";
msg += str;
throw std::runtime_error(msg);
}

So far, so good, but when I have a function that searches and returns
something:

foo const* search_foo()
{
...
// not found
throw_error("couldn't find foo");
}

The compiler complains that not all paths return something. Of course, I
could add a return 0 statement after the throw_error call, but my idea was
to tell the compiler that throw_error doesn't return by declaring it like
this:

void __declspec(noreturn) throw_error( char const* str);

Now, the compiler also doesn't complain, just as the docs[1] say. However, I
only found use of this function with things like exit(), _exit() and
abort(), which indeed do not return by terminating the program.

Now to my question: is this technique safe when the function throws an
exception? I could well imagine that cleanup code that would have to be
executed during stack unwinding is omitted for functions that have the
noreturn attribute - it is not explicitly documented if it works for
functions that always throw.

Can anybody shed some light on this?

Uli

[1] first hit for 'noreturn' on MSDN.
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