Pavel Chikulaev wrote:
Hi all,
Is there any interest in tagged tuple as extension of tuples library or fusion library? The example:
struct name_t {}; //tagged types struct year_t {};
void foo() { tagged_tuple<std::string, name_t, int, year_t> s;
s.get<name_t>() = "Hello World"!; s.get<year_t>() = 2005; assert(s.get<0>() == s.get<name_t>()); assert(s.get<1>() == s.get<year_t>()); }
It already works in VC7.1 and VC8.0 :)
Reminds me of the mpl::inherit_linearly example: http://www.boost.org/libs/mpl/doc/refmanual/inherit-linearly.html (it shows a few-lines tuples implementation, using the value type as an "index").
What do you think?
As far as I can see, the semantics you propose can be decorated easily via MPL (set,begin,find,distance) and their use is uncommon enough to leave it an excercise to the user. Am I missing something ? Regards, Tobias