Boost C++ Application Development Cookbook - Second Edition

How to do it...

This is possibly one of the hardest recipes in this chapter. The resulting types are determined at compile time and values for those types are filled at runtime:

1. To implement that mix, we need the following headers:

#include <boost/fusion/include/remove_if.hpp>#include <boost/type_traits/is_arithmetic.hpp>

2. Now, we are ready to make a function that returns non-arithmetic types:

template <class Sequence>typename boost::fusion::result_of::remove_if<    const Sequence,     boost::is_arithmetic<boost::mpl::_1> >::type get_nonarithmetics(const Sequence& seq) {    return boost::fusion::remove_if<         boost::is_arithmetic<boost::mpl::_1>     >(seq);}

3. And a function that returns arithmetic types:

template <class Sequence>typename boost::fusion::result_of::remove_if< ...