Re: [LEAF] Loss of error_id

From: Bjorn Reese (breese_at_[hidden])
Date: 2020-05-26 21:53:25

On 2020-05-25 22:21, Emil Dotchevski via Boost wrote:

> You mean, as in:

Good example.

> leaf::result<float> f(); // Returns a float or an error
> 
> leaf::result<int> g() // Returns an int or an error
> {
>    (void) f(); // Discard the float or the error returned by f
>    return 42;
> }

Suppose there is also an h() function in the call stack that is being
called by the error_handler() function instead of g():

   leaf::result<int> h()
   {
       auto res = g();
       // How to detect that f() raised an error without knowing
       // its error_id?
       return res;
   }

Can this function detect that someone further up the call stack has
already raised an error? Similar to std::uncaught_exceptions()?