55 lines
1.4 KiB
Plaintext
55 lines
1.4 KiB
Plaintext
// 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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