Re: [Boost-users] [mpl] at_c type compiler error

18 Oct 2007

      Chris Weed schrieb:
...
On 10/18/07, Vinzenz 'evilissimo' Feenstra  wrote:
...
Vinzenz 'evilissimo' Feenstra schrieb:
...
Chris Weed schrieb:
...
Hi,
I can't figure out why the following code generates a compile error
with gcc 3.4:
Hi,
shouldn't it be:
template
  typename boost::tuples::element::type::value,T>::type
  foo(E e,T t)
  {
    return t.get<0>();
  }
Regards,
Vinzenz
Nevermind this wasn't the problem. Here's a working one ;)
#include 
#include 
#include 
template
typename boost::tuples::element<
          boost::mpl::at_c::type::value , T
          >::type
foo(E e, T t)
{
   return boost::get<0>(t);
}
int main()
{
   typedef boost::mpl::vector_c elements;
   boost::tuple<int> t(1);
   foo(elements(),t);
}
That fixes it, but I don't see why, or what this change had to do with
the error message.
Thanks,
Chris
Look at this error message:
"main.cpp:10: error: invalid use of member (did you forget the `&' ?)"

the rest just describes where it happened.

I don't know why but there's no method get<int>() in tuple anymore or if 
there was one. I was confused by this as well. then I had a look into 
the 1.34.1 sources and wasn't abled to find a member get<int>()

So I changed the code to use the external one and it worked.

Regards,
Vinzenz