Re: [boost] [proto] design of expr<>

From: Eric Niebler (eric_at_[hidden])
Date: 2008-03-20 20:11:56

Larry Evans wrote:
> On 03/20/08 18:10, Eric Niebler wrote:
>> Tags don't have arities, expressions do. 
>> The arity of tag::function could be anything. The arity represents the 
>> number of children of an expression node. So the arity is a very real 
>> part of an expression.
>>
> So:
> 
>    expr<tag::shift_right, Args, 20>
> 
> is a valid expression?

If Args has 20 elements in it, sure.

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com