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template<
typename T1
, typename T2
>
struct pair
{
typedef pair type;
typedef T1 first;
typedef T2 second;
};
A transparent holder for two arbitrary types.
#include <boost/mpl/pair.hpp>
Count a number of elements in the sequence together with a number of negative elements among these.
typedef fold< vector_c<int,-1,0,5,-7,-2,4,5,7> , pair< int_<0>, int_<0> > , pair< next< first<_1> > , if_< less< _2, int_<0> > , next< second<_1> > , second<_1> > > >::type p; BOOST_MPL_ASSERT_RELATION( p::first::value, ==, 8 ); BOOST_MPL_ASSERT_RELATION( p::second::value, ==, 3 );