79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
// 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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/**
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\file
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\brief non_base_dimension.cpp
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\details
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Another example of user-defined units with conversions.
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Output:
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@verbatim
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//[non_base_dimension_output
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//]
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@endverbatim
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**/
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#include <iostream>
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#include <boost/units/io.hpp>
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#include <boost/units/conversion.hpp>
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#include <boost/units/unit.hpp>
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#include <boost/units/quantity.hpp>
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#include <boost/units/physical_dimensions.hpp>
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#include <boost/units/base_unit.hpp>
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#include <boost/units/make_system.hpp>
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namespace boost {
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namespace units {
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//[non_base_dimension_snippet_1
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struct imperial_gallon_tag :
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base_unit<imperial_gallon_tag, volume_dimension, 1> { };
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typedef make_system<imperial_gallon_tag>::type imperial;
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typedef unit<volume_dimension,imperial> imperial_gallon;
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struct us_gallon_tag : base_unit<us_gallon_tag, volume_dimension, 2> { };
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typedef make_system<us_gallon_tag>::type us;
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typedef unit<volume_dimension,us> us_gallon;
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//]
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} // namespace units
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} // namespace boost
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BOOST_UNITS_DEFINE_CONVERSION_FACTOR(boost::units::imperial_gallon_tag,
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boost::units::us_gallon_tag,
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double, 1.2009499255);
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using namespace boost::units;
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int main(void)
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{
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quantity<imperial_gallon> ig1(1.0*imperial_gallon());
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quantity<us_gallon> ug1(1.0*us_gallon());
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quantity<imperial_gallon> ig2(ug1);
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quantity<us_gallon> ug2(ig1);
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return 0;
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}
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