Re: [Boost-users] Copying types from a mpl vector to a fusion vector

On Dec 1, 2007 9:22 AM, Germán Diago wrote:

Hello. I'm trying to build a library and I'm doing heavy use of boost mpl and fusion libraries. I'd like to know a way to fill a boost::fusion::vector<> with the types contained in a boost::mpl::vector. Anyone knows how to do this? The code I have so far:

template struct Func {

//This is the initial sequence typedef typename boost::mpl::vector sequence;

//The sequence without NullTypes typedef typename boost::mpl::filter_view > >::type validsequence;

//The vector I want to fill with validsequence. Note that this is a fusion vector, not a mpl vector typedef boost::fusion::vector<> voidvector;

/***************PROBLEM HERE*******************/ //I want to copy validsequence types into voidvector typedef typename somewaytocopy::type type; };

Hi Germán, I think the following might work (untested): #include #include // ... typedef typename boost::fusion::result_of::as_vector<validsequence>::type fusion_valid_sequence; fusion_valid_sequence fusion_vector; (You can't fill voidvector with the types, since you already made it a fusion::vector<>) HTH, Stjepan