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+// Boost.Units - A C++ library for zero-overhead dimensional analysis and
+// unit/quantity manipulation and conversion
+//
+// Copyright (C) 2003-2008 Matthias Christian Schabel
+// Copyright (C) 2007-2008 Steven Watanabe
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNITS_SCALE_HPP_INCLUDED
+#define BOOST_UNITS_SCALE_HPP_INCLUDED
+
+///
+/// \file
+/// \brief 10^3 Engineering & 2^10 binary scaling factors for autoprefixing.
+/// \details
+///
+
+#include <string>
+
+#include <boost/units/config.hpp>
+#include <boost/units/static_rational.hpp>
+#include <boost/units/units_fwd.hpp>
+#include <boost/units/detail/one.hpp>
+#include <boost/units/detail/static_rational_power.hpp>
+
+namespace boost {
+
+namespace units {
+
+template<class S, class Scale>
+struct scaled_base_unit;
+
+/// class representing a scaling factor such as 10^3
+/// The exponent must be a static rational.
+template<long Base, class Exponent>
+struct scale
+{
+ static const long base = Base;
+ typedef Exponent exponent;
+ typedef double value_type;
+ static value_type value() { return(detail::static_rational_power<Exponent>(static_cast<double>(base))); }
+ // These need to be defined in specializations for
+ // printing to work.
+ // static std::string name();
+ // static std::string symbol();
+};
+
+template<long Base, class Exponent>
+const long scale<Base, Exponent>::base;
+
+/// INTERNAL ONLY
+template<long Base>
+struct scale<Base, static_rational<0> >
+{
+ static const long base = Base;
+ typedef static_rational<0> exponent;
+ typedef one value_type;
+ static one value() { one result; return(result); }
+ static std::string name() { return(""); }
+ static std::string symbol() { return(""); }
+};
+
+template<long Base>
+const long scale<Base, static_rational<0> >::base;
+
+template<long Base,class Exponent>
+std::string symbol_string(const scale<Base,Exponent>&)
+{
+ return scale<Base,Exponent>::symbol();
+}
+
+template<long Base,class Exponent>
+std::string name_string(const scale<Base,Exponent>&)
+{
+ return scale<Base,Exponent>::name();
+}
+
+#ifndef BOOST_UNITS_DOXYGEN
+
+#define BOOST_UNITS_SCALE_SPECIALIZATION(base_,exponent_,val_,name_,symbol_) \
+template<> \
+struct scale<base_, exponent_ > \
+{ \
+ static const long base = base_; \
+ typedef exponent_ exponent; \
+ typedef double value_type; \
+ static value_type value() { return(val_); } \
+ static std::string name() { return(#name_); } \
+ static std::string symbol() { return(#symbol_); } \
+}
+
+#define BOOST_UNITS_SCALE_DEF(exponent_,value_,name_,symbol_) \
+BOOST_UNITS_SCALE_SPECIALIZATION(10,static_rational<exponent_>,value_, name_, symbol_)
+
+BOOST_UNITS_SCALE_DEF(-24, 1e-24 ,yocto, y);
+BOOST_UNITS_SCALE_DEF(-21, 1e-21, zepto, z);
+BOOST_UNITS_SCALE_DEF(-18, 1e-18, atto, a);
+BOOST_UNITS_SCALE_DEF(-15, 1e-15, femto, f);
+BOOST_UNITS_SCALE_DEF(-12, 1e-12, pico, p);
+BOOST_UNITS_SCALE_DEF(-9, 1e-9, nano, n);
+BOOST_UNITS_SCALE_DEF(-6, 1e-6, micro, u);
+BOOST_UNITS_SCALE_DEF(-3, 1e-3, milli, m);
+BOOST_UNITS_SCALE_DEF(-2, 1e-2, centi, c);
+BOOST_UNITS_SCALE_DEF(-1, 1e-1, deci, d);
+
+BOOST_UNITS_SCALE_DEF(1, 1e1, deka, da);
+BOOST_UNITS_SCALE_DEF(2, 1e2, hecto, h);
+BOOST_UNITS_SCALE_DEF(3, 1e3, kilo, k);
+BOOST_UNITS_SCALE_DEF(6, 1e6, mega, M);
+BOOST_UNITS_SCALE_DEF(9, 1e9, giga, G);
+BOOST_UNITS_SCALE_DEF(12, 1e12, tera, T);
+BOOST_UNITS_SCALE_DEF(15, 1e15, peta, P);
+BOOST_UNITS_SCALE_DEF(18, 1e18, exa, E);
+BOOST_UNITS_SCALE_DEF(21, 1e21, zetta, Z);
+BOOST_UNITS_SCALE_DEF(24, 1e24, yotta, Y);
+
+BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<10>, 1024.0, kibi, Ki);
+BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<20>, 1048576.0, mebi, Mi);
+BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<30>, 1073741824.0, gibi, Gi);
+BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<40>, 1099511627776.0, tebi, Ti);
+BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<50>, 1125899906842624.0, pebi, Pi);
+BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<60>, 1152921504606846976.0, exbi, Ei);
+
+#undef BOOST_UNITS_SCALE_DEF
+#undef BOOST_UNITS_SCALE_SPECIALIZATION
+
+#endif
+
+} // namespace units
+
+} // namespace boost
+
+#if BOOST_UNITS_HAS_BOOST_TYPEOF
+
+#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
+
+BOOST_TYPEOF_REGISTER_TEMPLATE(boost::units::scale, (long)(class))
+
+#endif
+
+#endif