| 1 | // Copyright David Abrahams 2003. |
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| 2 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 3 | // 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 | #ifndef BOOST_IMPLICIT_CAST_DWA200356_HPP |
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| 7 | #define BOOST_IMPLICIT_CAST_DWA200356_HPP |
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| 8 | |
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| 9 | #include <boost/config.hpp> |
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| 10 | #ifdef BOOST_HAS_PRAGMA_ONCE |
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| 11 | # pragma once |
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| 12 | #endif |
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| 13 | |
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| 14 | namespace boost { |
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| 15 | |
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| 16 | namespace detail { |
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| 17 | |
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| 18 | template<class T> struct icast_identity |
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| 19 | { |
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| 20 | typedef T type; |
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| 21 | }; |
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| 22 | |
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| 23 | } // namespace detail |
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| 24 | |
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| 25 | // implementation originally suggested by C. Green in |
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| 26 | // http://lists.boost.org/MailArchives/boost/msg00886.php |
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| 27 | |
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| 28 | // The use of identity creates a non-deduced form, so that the |
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| 29 | // explicit template argument must be supplied |
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| 30 | template <typename T> |
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| 31 | constexpr T implicit_cast (typename boost::detail::icast_identity<T>::type x) { |
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| 32 | return x; |
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| 33 | } |
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| 34 | |
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| 35 | } // namespace boost |
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| 36 | |
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| 37 | |
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| 38 | #endif // BOOST_IMPLICIT_CAST_DWA200356_HPP |
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| 39 | |
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