Re: [boost] Review Request: Boost Exception

From: David Abrahams (dave_at_[hidden])
Date: 2006-11-14 20:41:41

Matthew Herrmann <matthew.herrmann_at_[hidden]> writes:

> I think Mr Abrahams is referring to an idea similar to this: (please 
> ignore the class name, it is a placeholder only)
>
> void read_file()
> {
>    boost::exception_info e(..., filename, current_pos, is_connected);
>     ...
>     e.success();
>     return;
> }
>
> e.success() sets a flag to true, which prevents the generation of error 
> information when the object is destroyed. 

No, that's not quite what I meant.

void tag_exception(boost::exception& x)
{
    // do something to x
}

void read_file()
{
   boost::adorn_exception e( boost::bind( tag_exception, _1 ) );
   ...
}

> To remove the e.success(), you'd need to detect whether the stack
> was being unwound due to an exception or due to a natural
> return. This is where language support (or compiler-dependent
> tricks) would be required.

We already have that facility: std::uncaught_exception().

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com