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57 lines
2.2 KiB
57 lines
2.2 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) 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_STATIC_CONSTANT_HPP |
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#define BOOST_UNITS_STATIC_CONSTANT_HPP |
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#include <boost/units/config.hpp> |
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/// A convenience macro that allows definition of static |
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/// constants in headers in an ODR-safe way. |
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#define BOOST_UNITS_STATIC_CONSTANT(name, type) \ |
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template<bool b> \ |
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struct name##_instance_t \ |
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{ \ |
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static const type instance; \ |
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}; \ |
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\ |
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namespace \ |
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{ \ |
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static const type& name = name##_instance_t<true>::instance; \ |
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} \ |
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\ |
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template<bool b> \ |
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const type name##_instance_t<b>::instance |
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/// A convenience macro for static constants with auto |
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/// type deduction. |
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#if BOOST_UNITS_HAS_TYPEOF |
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#if BOOST_UNITS_HAS_BOOST_TYPEOF |
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#define BOOST_UNITS_AUTO_STATIC_CONSTANT(name, value) \ |
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BOOST_TYPEOF_NESTED_TYPEDEF(name##_nested_t, value) \ |
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BOOST_UNITS_STATIC_CONSTANT(name, name##_nested_t::type) = (value) |
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#elif BOOST_UNITS_HAS_MWERKS_TYPEOF |
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#define BOOST_UNITS_AUTO_STATIC_CONSTANT(name, value) \ |
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BOOST_UNITS_STATIC_CONSTANT(name, __typeof__(value)) = (value) |
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#elif BOOST_UNITS_HAS_GNU_TYPEOF |
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#define BOOST_UNITS_AUTO_STATIC_CONSTANT(name, value) \ |
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BOOST_UNITS_STATIC_CONSTANT(name, typeof(value)) = (value) |
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#endif // BOOST_UNITS_HAS_BOOST_TYPEOF |
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#endif // BOOST_UNITS_HAS_TYPEOF |
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#endif // BOOST_UNITS_STATIC_CONSTANT_HPP
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