Re: [boost] [proto]How to for_each on children?

From: Eric Niebler (eric_at_[hidden])
Date: 2007-06-01 17:56:29

Larry Evans wrote:
>>>              for(long ichild=0; ichild<Arity; ++ichild)
>>>              {
>>>                  proto::eval(proto::arg_c<Expr,ichild>(expr), *this);
>>>              }

That's really not going to work. If you #include proto/fusion.hpp, you 
can use fusion::for_each on the children nodes as follows:

   fusion::for_each( proto::children_of(expr), myfunc() );

>              template<long Index>
>              void operator()(mpl::integral_c<long,Index>&)
>              {
>  
> proto::eval(proto::arg_c<Expr,Index>(my_parent),my_context);

And yours is another way to skin the cat, but this line needs to be:

   proto::eval(proto::arg_c<Index>(my_parent),my_context);

HTH,

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