| /* |
| Copyright 2020 Glen Joseph Fernandes |
| (glenjofe@gmail.com) |
| |
| Distributed under the Boost Software License, |
| Version 1.0. (See accompanying file LICENSE_1_0.txt |
| or copy at http://www.boost.org/LICENSE_1_0.txt) |
| */ |
| |
| #ifndef BOOST_TT_DISJUNCTION_HPP_INCLUDED |
| #define BOOST_TT_DISJUNCTION_HPP_INCLUDED |
| |
| #include <boost/type_traits/conditional.hpp> |
| #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) |
| #include <boost/type_traits/integral_constant.hpp> |
| #endif |
| |
| namespace boost { |
| |
| #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) |
| template<class...> |
| struct disjunction |
| : false_type { }; |
| |
| template<class T> |
| struct disjunction<T> |
| : T { }; |
| |
| template<class T, class... U> |
| struct disjunction<T, U...> |
| : conditional<bool(T::value), T, disjunction<U...> >::type { }; |
| #else |
| template<class T, class U> |
| struct disjunction |
| : conditional<bool(T::value), T, U>::type { }; |
| #endif |
| |
| } /* boost */ |
| |
| #endif |
