[boost] [parameter] Binding type.

From: Rene Rivera (grafik.list_at_[hidden])
Date: 2006-03-06 13:04:17

I've been Boost.Parameter a bit by now and I have some usability 
feedback. There is one thing that currently bugs be a bit, the type 
defined by parameter::binding. All my uses so far have been of the form:

typedef typename
   boost::remove_reference<
     boost::remove_const<
       boost::parameter::binding<ArgPack,tag::something>::type
       >::type
     >::type
   something_t;

something_t s = args[something];

Or equivalent thereof. So every use I have I end up removing the ref and 
const because I'm really interested in the original type, and hence want 
to make a copy. Now I understand the rational outlined in "Eliminating 
Copies" 
<http://www.boost.org/libs/parameter/doc/html/index.html#eliminating-copies>. 
But I think that isn't enough of a justification for dirtying up the 
user interface, as above. I'd rather that the binding type where the 
value type so that one would have:

typedef typename
   boost::parameter::binding<ArgPack,tag::something>::type
   something_t;

something_t s = args[something];

Having it that way one still has the option of more naturally using the 
reference type as;

something_t const & q = args[something];

And possibly also providing the container standard binding::value_type, 
and binding::const_reference.

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