id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5604	Boost.Phoenix: Provide access to thrown exception in catch handler	Stuart Dootson <stuart.dootson@…>	Thomas Heller	"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 exception 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?

Adding a similar placeholder to give access to the exception object would be a very useful addition to Phoenix..."	Feature Requests	closed		phoenix	Boost 1.47.0	Problem	fixed	exception placeholder	braden@…