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1 | // (C) Copyright John Maddock & Thorsten Ottosen 2005.
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2 | // Use, modification and distribution are subject to the Boost Software License,
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3 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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4 | // http://www.boost.org/LICENSE_1_0.txt).
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5 | //
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6 | // See http://www.boost.org/libs/type_traits for most recent version including documentation.
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7 |
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8 |
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9 | #ifndef BOOST_TT_DECAY_HPP_INCLUDED
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10 | #define BOOST_TT_DECAY_HPP_INCLUDED
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11 |
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12 | #include "boost/type_traits/config.hpp"
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13 | #include <boost/type_traits/is_array.hpp>
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14 | #include <boost/type_traits/is_function.hpp>
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15 | #include <boost/type_traits/remove_bounds.hpp>
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16 | #include <boost/type_traits/add_pointer.hpp>
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17 | #include <boost/type_traits/remove_reference.hpp>
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18 | #include <boost/mpl/eval_if.hpp>
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19 | #include <boost/mpl/identity.hpp>
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20 |
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21 | namespace boost
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22 | {
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23 |
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24 | template< class T >
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25 | struct decay
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26 | {
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27 | private:
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28 | typedef BOOST_DEDUCED_TYPENAME remove_reference<T>::type Ty;
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29 | public:
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30 | typedef BOOST_DEDUCED_TYPENAME mpl::eval_if<
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31 | is_array<Ty>,
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32 | mpl::identity<BOOST_DEDUCED_TYPENAME remove_bounds<Ty>::type*>,
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33 | BOOST_DEDUCED_TYPENAME mpl::eval_if<
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34 | is_function<Ty>,
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35 | add_pointer<Ty>,
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36 | mpl::identity<Ty>
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37 | >
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38 | >::type type;
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39 | };
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40 |
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41 | } // namespace boost
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42 |
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43 |
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44 | #endif // BOOST_TT_DECAY_HPP_INCLUDED
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