[Boost-users] [fusion][Functional] LValue arguments limitation

Subject: [Boost-users] [fusion][Functional] LValue arguments limitation
From: alfC (alfredo.correa_at_[hidden])
Date: 2010-11-09 05:01:57

Fusion manual says:

Only LValue arguments are accepted. To overcome this limitation, apply
Boost.Functional/Forward.

I understand that this has to do with not being able to pass literal
constants to the function, e.g.

unfused<f> uf;
uf(1., 2.); //can't

First:
1) can anybody explain why is this?
2)
uf(   (double const&)
 1.,  (double const&)
 2.
);
seems to work, but it is probably a hack. (not portable maybe?)

3) the manual says also to use Boost.Functional/Forward to overcome
this limitation. What does it mean by this?

Thank you,
Alfredo