exercise-3-1.hpp

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// ===-- chapter-3/exercise-3-1.hpp ----------------------- -*- C++ -*- --=== //
#ifndef EXERCISE_3_1
#define EXERCISE_3_1
 
#include <boost/mpl/int.hpp>
#include <boost/mpl/plus.hpp>
#include <boost/mpl/transform.hpp>
 
#include <boost/mpl/placeholders.hpp>
using namespace boost::mpl::placeholders;
 
 
namespace exercise_3_1 {
 
struct ex_3_1apply
{
    template <typename T>
    struct apply : boost::mpl::plus< T, boost::mpl::int_<1> > { };
};
 
template <typename T>
struct ex_3_1 : boost::mpl::transform<T, ex_3_1apply > { };
 
template <typename T>
struct ex_3_1b
    : boost::mpl::transform<
        T,
        boost::mpl::plus< _1, boost::mpl::int_<1> >
        >
{ };
 
} // namespace exercise_3_1
 
#endif // EXERCISE_3_1