Re: [Boost-users] [mpl|fusion|tr1]mpl::at_c<std::tr1::tuple<...>, I>::type fails

Markus Werle wrote:

Markus Werle writes:

...

Hi!

I am using boost_1_36_0 manually patched with the files mentioned in http://thread.gmane.org/gmane.comp.lib.boost.user/39093/focus=39106

I thought that std::tr1::tuple was a valid mpl sequence, but this code here fails. Is this by design?

---snip--- #include #include #include

template struct show_problem { typedef typename boost::mpl::at_c::type type; };

int main() { typedef std::tr1::tuple tuple_t;

typedef boost::mpl::at_c::type Ouch; }

It's std. So it has to make a difference:

typedef std::tr1::tuple_element< 1L, tuple_t>::type OK;

Looks like we end with a plethora of different compile-time sequences all using different element access semantics, leaving us with an uncomfortable feeling about the TR1 ... where will this end?

Markus

Did you #include ? That one got me a while ago with Boost.Tuple -- apparently tuples are Fusion sequences *after* you include the header that adapts them... --John