Re: [Boost-users] MPL. Nested Lambdas

Subject: Re: [Boost-users] MPL. Nested Lambdas
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2010-02-20 20:09:42

AMDG

OvermindDL1 wrote:
> On Sat, Feb 20, 2010 at 1:21 PM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
>   
>> 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

Umm, Phoenix may be a replacement for Boost.Lambda, but it doesn't
replace Boost.MPL.Lambda.

In Christ,
Steven Watanabe