Re: [Boost-users] MPL. Nested Lambdas

Subject: Re: [Boost-users] MPL. Nested Lambdas
From: OvermindDL1 (overminddl1_at_[hidden])
Date: 2010-02-20 19:56:10

On Sat, Feb 20, 2010 at 1:21 PM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
> AMDG
>
> dilas dilas wrote:
>>
>> Please, tell me if one can write nested lambda expressions like
>>
>> "
>> template<class Result, class Seq, class Elem> struct pairs: bm::fold<Seq,
>> Result, bm::push_back<_1,bm::pair<Elem, _2 > > >{};
>> template<class Seq1, class Seq2>
>> struct AllPairs: bm::fold<Seq1, bm::vector<>, pairs<_1,Seq2,_2> >{};
>> "
>>
>> without using intermediate metafunctions.
>
> This ought to work, since the placeholders in AllPairs will be expanded
> before
> pairs is ever invoked.

I do not know about Lambda, but I know that you can create
sub-functors in phoenix just fine, it has specific constructs for that
too.

If you do not know, Boost.Phoenix is a complete replacement for
Boost.Lambda, plus a lot more.
http://www.boost.org/doc/libs/1_42_0/libs/spirit/phoenix/doc/html/index.html