Re: [Boost-users] [Fusion] How to join more than two sequences

On 09/22/10 07:33, Larry Evans wrote:

On 09/21/10 19:31, Clinton Mead wrote:

...

On Wed, Sep 22, 2010 at 1:22 AM, Larry Evans mailto:cppljevans@suddenlink.net> wrote:

Couldn't fold be used to join any number of sequences?

-Larry

Hi Larry

Something like?

? join_all(seq) { return fold(seq, vector<>(), join<?, ?>()); }

Could you fill in the question marks?

To be honest, I really was only guessing fold would work. I've never actually used it do to something like this; hence, I'm not the best person to help you :(

However, I'm wondering why:

http://www.boost.org/doc/libs/1_44_0/libs/fusion/doc/html/fusion/algorithm/i...

doesn't help oneself 'fill in the question marks'?

The attachment shows my try; however, it fails to compile with the error: fold_join.cpp:87:47: instantiated from here /home/evansl/prog_dev/boost-svn/ro/trunk/boost/fusion/support/detail/category_of.hpp:15:38: error: 'const boost::fusion::joint_view&, boost::fusion::vector&>&' is not a class, struct, or union type Anyone have an idea what's wrong? -Larry