Re: [Boost-users] [proto] another const issue

Subject: Re: [Boost-users] [proto] another const issue
From: Eric Niebler (eric_at_[hidden])
Date: 2009-08-25 16:21:31

Maurizio Vitale wrote:
>>>>>> "Eric" == Eric Niebler <eric_at_[hidden]> writes:
> 
>     Eric> Maurizio Vitale wrote:
> 
>     Eric> This says, only terminals that are references to ints are
>     Eric> allowed. my_int is an int terminal, not an int& terminal,
>     Eric> therefore it doesn't match.
> 
> Ops. I still have in the back of my mind that everything is by-reference
> in proto, so saying int& was my way to eliminate the const int& case.
> 
> Thanks.

Proto will hold things by reference or by value, depending on what you 
ask for. You defined the my_int terminal type as:

   struct my_int
     : my_expr< proto::terminal< int >::type >

That's an int held by value.

-- 
Eric Niebler
BoostPro Computing
http://www.boostpro.com