Re: [Boost-users] [fusion][mpl] Generating a fusion sequence type from an MPL sequence

On 10/19/2010 3:24 AM, Gabriel Redner wrote:

Hi all,

I am unexpectedly stuck looking for some functionality which I assumed would be present. Given an MPL sequence, I want to generate the type of a corresponding fusion sequence, which I can then use to store things:

mpl::vector mpl_vec; typedef some_metafunction::type fusion_vec; // equivalent to fusion::vector fusion_vec vec(5, "foo");

Does some_metafunction exist? I'm not sure if I'm just not seeing it (or perhaps thinking wrongly about the problem), or if it really is not present.

I was looking at the fusion/mpl bridge at [1], but its functionality seems orthogonal to what I want.

Thanks, -Gabe

[1] http://www.boost.org/doc/libs/1_44_0/libs/fusion/doc/html/fusion/adapted/mpl...

Sure. Check out fusion::as_vector. You can use it to convert any fusion compatible sequence to a fusion vector. MPL sequences are fusion compatible. typedef fusion::result_of::as_vector::type fusion_vec; Regards, -- Joel de Guzman http://www.boostpro.com http://spirit.sf.net