Re: [Boost-users] Boost.Phoenix Exception Handling

Subject: Re: [Boost-users] Boost.Phoenix Exception Handling
From: Thomas Heller (thom.heller_at_[hidden])
Date: 2011-06-12 05:57:28

On Friday, June 10, 2011 04:51:53 PM Stuart Dootson wrote:
> I've been using Phoenix (the one that came with 1.44 - that's Phoenix v2?)
> for a bit, as a Boost.Lambda replacement, mostly happily. But I've come
> across a scenario I don't think Phoenix caters for, namely accessing an
> exception from a catch_ body, something like this:
> 
> std::vector<std::string> errors;
> using namespace boost::phoenix;
> using namespace boost::phoenix::arg_names;
> std::for_each(changes.begin(), changes.end(),
>    try_
>    [
>       bind(&SomeClass::AddChange, this, arg1, std::string())
>    ]
>    .catch_<std::runtime_error>()
>    [
>       push_back(ref(errors), bind(&std::runtime_error::what, /* Can I access
> the exceptin that's been thrown? */))
>    ]);
> 
> I want to aggregate any error information thrown by SomeClass::AddChange in
> the 'errors' vector, to be rethrown after the for_each. In Boost.Lambda, I'd
> be able to use the '_e' placeholder to access the exception object, but
> there seems to be no way of doing so in Phoenix?
> 
> So, I'm just wondering if a) I've missed something, and b) is there any
> likelihood of this being added into Phoenix v3 at some point?

Yes, I can see the usefulnes of that feature, can you please add a feature 
request to trac?

Regards,
Thomas