| 1 | /* |
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| 2 | Copyright 2003 The Trustees of Indiana University |
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| 3 | |
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| 4 | Authors: Jaakko Jarvi (jajarvi at osl.iu.edu) |
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| 5 | Jeremiah Willcock (jewillco at osl.iu.edu) |
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| 6 | Andrew Lumsdaine (lums at osl.iu.edu) |
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| 7 | |
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| 8 | Copyright 2018 Glen Joseph Fernandes |
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| 9 | (glenjofe@gmail.com) |
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| 10 | |
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| 11 | Distributed under the Boost Software License, |
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| 12 | Version 1.0. (See accompanying file LICENSE_1_0.txt |
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| 13 | or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 14 | */ |
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| 15 | #ifndef BOOST_TT_ENABLE_IF_HPP_INCLUDED |
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| 16 | #define BOOST_TT_ENABLE_IF_HPP_INCLUDED |
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| 17 | |
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| 18 | #include <boost/config.hpp> |
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| 19 | |
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| 20 | namespace boost { |
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| 21 | |
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| 22 | template<bool B, class T = void> |
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| 23 | struct enable_if_ { |
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| 24 | typedef T type; |
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| 25 | }; |
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| 26 | |
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| 27 | template<class T> |
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| 28 | struct enable_if_<false, T> { }; |
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| 29 | |
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| 30 | #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) |
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| 31 | template<bool B, class T = void> |
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| 32 | using enable_if_t = typename enable_if_<B, T>::type; |
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| 33 | #endif |
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| 34 | |
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| 35 | } /* boost */ |
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| 36 | |
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| 37 | #endif |
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| 38 | |
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