56 lines
1.3 KiB
Plaintext
56 lines
1.3 KiB
Plaintext
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// 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_DIMENSIONLESS_TYPE_HPP
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#define BOOST_UNITS_DIMENSIONLESS_TYPE_HPP
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///
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/// \file
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/// \brief Dimension lists in which all exponents resolve to zero reduce to @c dimensionless_type.
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///
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#include <boost/mpl/long.hpp>
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#include <boost/mpl/deref.hpp>
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#include <boost/mpl/arithmetic.hpp>
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#include <boost/units/config.hpp>
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namespace boost {
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namespace units {
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namespace detail {
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struct dimension_list_tag;
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}
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/// Dimension lists in which all exponents resolve to zero reduce to @c dimensionless_type.
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struct dimensionless_type
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{
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typedef dimensionless_type type;
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typedef detail::dimension_list_tag tag;
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typedef mpl::long_<0> size;
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};
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} // namespace units
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} // namespace boost
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#if BOOST_UNITS_HAS_BOOST_TYPEOF
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#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
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BOOST_TYPEOF_REGISTER_TYPE(boost::units::dimensionless_type)
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#endif
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#endif // BOOST_UNITS_DIMENSIONLESS_TYPE_HPP
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