| // Boost.Units - A C++ library for zero-overhead dimensional analysis and | |
| // unit/quantity manipulation and conversion | |
| // | |
| // Copyright (C) 2003-2008 Matthias Christian Schabel | |
| // Copyright (C) 2007-2008 Steven Watanabe | |
| // | |
| // 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_UNITS_DETAIL_PREVENT_REDEFINITION_HPP | |
| #define BOOST_UNITS_DETAIL_PREVENT_REDEFINITION_HPP | |
| #include <boost/mpl/long.hpp> | |
| namespace boost { | |
| namespace units { | |
| namespace detail { | |
| struct no { no() {} char dummy; }; | |
| struct yes { no dummy[2]; }; | |
| template<bool> struct ordinal_has_already_been_defined; | |
| template<> | |
| struct ordinal_has_already_been_defined<true> { }; | |
| template<> | |
| struct ordinal_has_already_been_defined<false> { typedef void type; }; | |
| } | |
| /// This must be in namespace boost::units so that ADL | |
| /// will work. we need a mangled name because it must | |
| /// be found by ADL | |
| /// INTERNAL ONLY | |
| template<class T> | |
| detail::no | |
| boost_units_is_registered(const T&) | |
| { detail::no result; return(result); } | |
| /// INTERNAL ONLY | |
| template<class T> | |
| detail::no | |
| boost_units_unit_is_registered(const T&) | |
| { detail::no result; return(result); } | |
| } // namespace units | |
| } // namespace boost | |
| #endif // BOOST_UNITS_PREVENT_ORDINAL_REDEFINITION_IMPL_HPP |