146 lines
5.0 KiB
C++
146 lines
5.0 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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#ifndef BOOST_UNITS_SCALE_HPP_INCLUDED
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#define BOOST_UNITS_SCALE_HPP_INCLUDED
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///
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/// \file
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/// \brief 10^3 Engineering & 2^10 binary scaling factors for autoprefixing.
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/// \details
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///
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#include <string>
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#include <boost/units/config.hpp>
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#include <boost/units/static_rational.hpp>
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#include <boost/units/units_fwd.hpp>
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#include <boost/units/detail/one.hpp>
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#include <boost/units/detail/static_rational_power.hpp>
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namespace boost {
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namespace units {
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template<class S, class Scale>
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struct scaled_base_unit;
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/// class representing a scaling factor such as 10^3
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/// The exponent must be a static rational.
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template<long Base, class Exponent>
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struct scale
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{
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static const long base = Base;
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typedef Exponent exponent;
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typedef double value_type;
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static value_type value() { return(detail::static_rational_power<Exponent>(static_cast<double>(base))); }
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// These need to be defined in specializations for
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// printing to work.
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// static std::string name();
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// static std::string symbol();
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};
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template<long Base, class Exponent>
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const long scale<Base, Exponent>::base;
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/// INTERNAL ONLY
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template<long Base>
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struct scale<Base, static_rational<0> >
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{
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static const long base = Base;
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typedef static_rational<0> exponent;
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typedef one value_type;
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static one value() { one result; return(result); }
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static std::string name() { return(""); }
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static std::string symbol() { return(""); }
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};
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template<long Base>
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const long scale<Base, static_rational<0> >::base;
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template<long Base,class Exponent>
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std::string symbol_string(const scale<Base,Exponent>&)
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{
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return scale<Base,Exponent>::symbol();
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}
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template<long Base,class Exponent>
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std::string name_string(const scale<Base,Exponent>&)
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{
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return scale<Base,Exponent>::name();
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}
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#ifndef BOOST_UNITS_DOXYGEN
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#define BOOST_UNITS_SCALE_SPECIALIZATION(base_,exponent_,val_,name_,symbol_) \
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template<> \
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struct scale<base_, exponent_ > \
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{ \
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static const long base = base_; \
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typedef exponent_ exponent; \
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typedef double value_type; \
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static value_type value() { return(val_); } \
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static std::string name() { return(#name_); } \
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static std::string symbol() { return(#symbol_); } \
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}
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#define BOOST_UNITS_SCALE_DEF(exponent_,value_,name_,symbol_) \
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BOOST_UNITS_SCALE_SPECIALIZATION(10,static_rational<exponent_>,value_, name_, symbol_)
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BOOST_UNITS_SCALE_DEF(-24, 1e-24, yocto, y);
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BOOST_UNITS_SCALE_DEF(-21, 1e-21, zepto, z);
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BOOST_UNITS_SCALE_DEF(-18, 1e-18, atto, a);
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BOOST_UNITS_SCALE_DEF(-15, 1e-15, femto, f);
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BOOST_UNITS_SCALE_DEF(-12, 1e-12, pico, p);
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BOOST_UNITS_SCALE_DEF(-9, 1e-9, nano, n);
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BOOST_UNITS_SCALE_DEF(-6, 1e-6, micro, u);
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BOOST_UNITS_SCALE_DEF(-3, 1e-3, milli, m);
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BOOST_UNITS_SCALE_DEF(-2, 1e-2, centi, c);
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BOOST_UNITS_SCALE_DEF(-1, 1e-1, deci, d);
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BOOST_UNITS_SCALE_DEF(1, 1e1, deka, da);
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BOOST_UNITS_SCALE_DEF(2, 1e2, hecto, h);
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BOOST_UNITS_SCALE_DEF(3, 1e3, kilo, k);
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BOOST_UNITS_SCALE_DEF(6, 1e6, mega, M);
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BOOST_UNITS_SCALE_DEF(9, 1e9, giga, G);
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BOOST_UNITS_SCALE_DEF(12, 1e12, tera, T);
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BOOST_UNITS_SCALE_DEF(15, 1e15, peta, P);
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BOOST_UNITS_SCALE_DEF(18, 1e18, exa, E);
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BOOST_UNITS_SCALE_DEF(21, 1e21, zetta, Z);
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BOOST_UNITS_SCALE_DEF(24, 1e24, yotta, Y);
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BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<10>, 1024.0, kibi, Ki);
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BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<20>, 1048576.0, mebi, Mi);
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BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<30>, 1073741824.0, gibi, Gi);
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BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<40>, 1099511627776.0, tebi, Ti);
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BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<50>, 1125899906842624.0, pebi, Pi);
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BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<60>, 1152921504606846976.0, exbi, Ei);
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BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<70>, 1180591620717411303424.0, zebi, Zi);
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BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<80>, 1208925819614629174706176.0, yobi, Yi);
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#undef BOOST_UNITS_SCALE_DEF
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#undef BOOST_UNITS_SCALE_SPECIALIZATION
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#endif
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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_TEMPLATE(boost::units::scale, (long)(class))
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#endif
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#endif
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