Re: [Boost-users] [fusion] memory layout of fusion::vector vs boost::tuple/boost::array

On Thu, Oct 7, 2010 at 5:42 PM, Alfredo Correa wrote:

On Thu, Oct 7, 2010 at 3:33 PM, OvermindDL1 wrote:

...

You do know that based on this:

 http://www.boost.org/doc/libs/1_44_0/libs/fusion/doc/html/fusion/adapted/boo... boost::array is already adapted as a fusion container and can be used directly, as soon as you include the proper hpp that is?

yes, thank you, that what I wrote in my last post . I can make this work

#include #include ... boost::array boostarr={{1.0, 2.1, 3.2}}; vector fusionvec(boostarr); //now works

Ah, heh, got lost in the noise and I missed it. On Thu, Oct 7, 2010 at 5:42 PM, Alfredo Correa wrote:

I still can't do the other way around:

boost::array boostarr2(fusionvec); //doesn't work ideas?

I know that would not work because that is still a 'custom' type as far as fusion is concerned, and only free functions can work on it, a constructor is obviously not a free function, so you need to write a free function to do it (probably called 'copy', probably using fusion's foreach to copy each element one to the other, should be pretty well optimized out thanks to the template-magic).