There are some terminals that, due to life-time issues, I cannot hold by
reference. I don't want, however, to hold them by value.
What I'm currently doing is that I'm holding a shared_ptr by value. For
all practical purposes, however, I'd prefer if the expression behaved as
a terminal of a reference, i.e. it would be nice if
boost::proto::value(xpr) could directly return a T& and not a
Currently I need to treat terminals of shared_ptr specially, but ideally
I'd like to have a way to extend terminal value capture with custom
Any way to do this?
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