Boost C++ Application Development Cookbook - Second Edition

How to do it...

This recipe is similar to the previous one, but it also uses conditional compile-time statements. Get ready, it won't be easy!

1. We shall start with headers:

// We'll need this at step 3.
#include <boost/mpl/size.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/static_assert.hpp>

// We'll need this at step 4.
#include <boost/mpl/if.hpp>
#include <boost/type_traits/make_unsigned.hpp>
#include <boost/type_traits/add_const.hpp>

// We'll need this at step 5.
#include <boost/mpl/transform.hpp>

2. Now, let's put all the metaprogramming magic inside the structure, for simpler reuse:

template <class Types, class Modifiers>
struct do_modifications {

3. It is a good thought to check that the passed vectors have the same size: ...