CPP-TemplateMetaprog/chapter-3-twice_8hpp_source.html

// ===-- chapter-3/chapter-3-twice.hpp -------------------- -*- C++ -*- --=== //

#ifndef CHAPTER_3_TWICE

#define CHAPTER_3_TWICE


#include <boost/mpl/apply.hpp>


namespace chapter3 {


template <typename F, typename X>

struct twice : boost::mpl::apply<F, typename boost::mpl::apply<F, X>::type> { };


} // namespace chapter3


#endif // CHAPTER_3_TWICE

chapter3
Provide utilities availble to all Chapter 3 solutions.
Definition: chapter-3-twice.hpp:17

chapter3::twice
Apply a metafunction to its own result.
Definition: chapter-3-twice.hpp:28