Re: [Boost-users] [fusion] construct a tuple's elements with arguments

Yuval Ronen wrote:

If I have a

typedef fusion::tuple T;

can I somehow create a T instance like

T t(1, "hello");

and by that I mean that each of T's elements (of types X, Y and Z) would be constructed using the constructor that accepts an int and a string, assuming there is such a constructor for all T's elements. If there isn't such constructor for all T's elements, then it shouldn't compile, of course.

No.

Of course using the exact syntax above is not possible, because it's reserved for something else, but any other syntax would be just as good (perhaps using in_place_factory).

Does it have to be done at construction? If not, you can use for_each. If yes, it might be interesting to have a forward fusion sequence that generates its elements on the fly (a generator). But this also presents some complications because you want the elements to be constructed with 2 arguments. So, I have no immediate ideas for you. If you have some specific suggestions, I'm all ears. Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net