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54 lines
1.3 KiB
54 lines
1.3 KiB
// Boost.Units - A C++ library for zero-overhead dimensional analysis and |
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// unit/quantity manipulation and conversion |
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// |
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// Copyright (C) 2003-2008 Matthias Christian Schabel |
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// Copyright (C) 2007-2008 Steven Watanabe |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BOOST_UNITS_DETAIL_PREVENT_REDEFINITION_HPP |
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#define BOOST_UNITS_DETAIL_PREVENT_REDEFINITION_HPP |
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#include <boost/mpl/long.hpp> |
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namespace boost { |
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namespace units { |
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namespace detail { |
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struct no { no() {} char dummy; }; |
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struct yes { no dummy[2]; }; |
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template<bool> struct ordinal_has_already_been_defined; |
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template<> |
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struct ordinal_has_already_been_defined<true> { }; |
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template<> |
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struct ordinal_has_already_been_defined<false> { typedef void type; }; |
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} |
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/// This must be in namespace boost::units so that ADL |
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/// will work. we need a mangled name because it must |
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/// be found by ADL |
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/// INTERNAL ONLY |
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template<class T> |
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detail::no |
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boost_units_is_registered(const T&) |
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{ detail::no result; return(result); } |
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/// INTERNAL ONLY |
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template<class T> |
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detail::no |
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boost_units_unit_is_registered(const T&) |
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{ detail::no result; return(result); } |
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} // namespace units |
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} // namespace boost |
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#endif // BOOST_UNITS_PREVENT_ORDINAL_REDEFINITION_IMPL_HPP
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