Re: Using exceptions in the core

[John W. Eaton]

On 10/02/2015 03:15 PM, John W. Eaton wrote:
> On 10/02/2015 02:39 PM, Rik wrote:
>
> > I also like the overloaded _value() method idea.  We could start out
> > small by just overloading the string_value () method since this seems to
> > be one of the most frequent occurrences where the function expected a
> > string, for an option maybe, but numeric input was given.
>
> Yes, I think this is the most frequent case of something like
>
>    if (! args(0).is_string ())
>      {
>        error ("...");
>        return retval;
>      }
>
> so I think it makes sense to start with this one and see what we think.
>   I'll work on this with my other changes.

My current idea is attached.  With it, you can write something like

  std::string url = args(0).string_value ("urlwrite: URL must be a 
string");

Comments?

jwe

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