Re: [Boost-users] [fusion] remove_if and as_vector with Placeholder Expression as predicate

14 Nov 2012


      On 11/13/12 1:11 AM, Felipe Magno de Almeida wrote:
...
Hello,
I'm trying to remove_if a few elements from a fusion sequence. But it
is instantiating
my predicate with the placeholder from MPL later on. Including with as_vector.
The following code generates the error code I'm pasting by the end of
the message.
I'm using GCC 4.7.2 and Linux x86_64. If I wrap meta_funcmpl::_1 in
a mpl::lambda<>::type
then the errors following the first error messages is what I get. I'm
not sure if I'm doing
something wrong here. If anyone could please shed some light, I would
really appreciate it.
#include 
#include 
namespace mpl = boost::mpl;
namespace fusion = boost::fusion;
struct element
{
   typedef mpl::false_ type;
};
template <typename T>
struct meta_func
{
   typedef typename T::type type;
};
int main()
{
   fusion::vector e;
   fusion::as_vector(fusion::remove_ifmpl::_1 >(e));
}
I've been noticing something similar recently only with GCC.
I haven't tracked the problem yet. I'm not sure if it's a Fusion,
MPL or GCC problem. Could you please add a trac ticket for this?


Regards,
-- 
Joel de Guzman
http://www.boostpro.com
http://boost-spirit.com