C++ Template Metaprogramming
Solutions to the exercises throughout the book
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chapter-3-twice.hpp
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1// ===-- chapter-3/chapter-3-twice.hpp -------------------- -*- C++ -*- --=== //
9#ifndef CHAPTER_3_TWICE
10#define CHAPTER_3_TWICE
11
12#include <boost/mpl/apply.hpp>
13
14
17namespace chapter3 {
18
27template <typename F, typename X>
28struct twice : boost::mpl::apply<F, typename boost::mpl::apply<F, X>::type> { };
29
30} // namespace chapter3
31
32#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