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Warning, file /include/boost/contract/detail/none.hpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).
0001 0002 #ifndef BOOST_CONTRACT_DETAIL_NONE_HPP_ 0003 #define BOOST_CONTRACT_DETAIL_NONE_HPP_ 0004 0005 // Copyright (C) 2008-2018 Lorenzo Caminiti 0006 // Distributed under the Boost Software License, Version 1.0 (see accompanying 0007 // file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt). 0008 // See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html 0009 0010 namespace boost { namespace contract { namespace detail { 0011 0012 // Tag for "no type". 0013 struct none { 0014 // Some lib code use this to avoid unused local var warnings on #if, etc. 0015 static none& value() { 0016 static none none_value; 0017 return none_value; 0018 } 0019 }; 0020 0021 // Transform `void` to `none` type (for convenience, instead of using MPL). 0022 template<typename T> struct none_if_void { typedef T type; }; 0023 template<> struct none_if_void<void> { typedef none type; }; 0024 0025 } } } // namespace 0026 0027 #endif // #include guard 0028
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