ceph/src/boost/libs/units/include/boost/units/scale.hpp

   1 // Boost.Units - A C++ library for zero-overhead dimensional analysis and
   2 // unit/quantity manipulation and conversion
   3 //
   4 // Copyright (C) 2003-2008 Matthias Christian Schabel
   5 // Copyright (C) 2007-2008 Steven Watanabe
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See
   8 // accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #ifndef BOOST_UNITS_SCALE_HPP_INCLUDED
  12 #define BOOST_UNITS_SCALE_HPP_INCLUDED
  13
  14 ///
  15 /// \file
  16 /// \brief 10^3 Engineering & 2^10 binary scaling factors for autoprefixing.
  17 /// \details
  18 ///
  19
  20 #include <string>
  21
  22 #include <boost/units/config.hpp>
  23 #include <boost/units/static_rational.hpp>
  24 #include <boost/units/units_fwd.hpp>
  25 #include <boost/units/detail/one.hpp>
  26 #include <boost/units/detail/static_rational_power.hpp>
  27
  28 namespace boost {
  29
  30 namespace units {
  31
  32 template<class S, class Scale>
  33 struct scaled_base_unit;
  34
  35 /// class representing a scaling factor such as 10^3
  36 /// The exponent must be a static rational.
  37 template<long Base, class Exponent>
  38 struct scale
  39 {
  40     static const long base = Base;
  41     typedef Exponent exponent;
  42     typedef double value_type;
  43     static value_type value() { return(detail::static_rational_power<Exponent>(static_cast<double>(base))); }
  44     // These need to be defined in specializations for
  45     // printing to work.
  46     // static std::string name();
  47     // static std::string symbol();
  48 };
  49
  50 template<long Base, class Exponent>
  51 const long scale<Base, Exponent>::base;
  52
  53 /// INTERNAL ONLY
  54 template<long Base>
  55 struct scale<Base, static_rational<0> >
  56 {
  57     static const long base = Base;
  58     typedef static_rational<0> exponent;
  59     typedef one value_type;
  60     static one value() { one result; return(result); }
  61     static std::string name() { return(""); }
  62     static std::string symbol() { return(""); }
  63 };
  64
  65 template<long Base>
  66 const long scale<Base, static_rational<0> >::base;
  67
  68 template<long Base,class Exponent>
  69 std::string symbol_string(const scale<Base,Exponent>&)
  70 {
  71     return scale<Base,Exponent>::symbol();
  72 }
  73
  74 template<long Base,class Exponent>
  75 std::string name_string(const scale<Base,Exponent>&)
  76 {
  77     return scale<Base,Exponent>::name();
  78 }
  79
  80 #ifndef BOOST_UNITS_DOXYGEN
  81
  82 #define BOOST_UNITS_SCALE_SPECIALIZATION(base_,exponent_,val_,name_,symbol_) \
  83 template<>                                                                   \
  84 struct scale<base_, exponent_ >                                              \
  85 {                                                                            \
  86     static const long base = base_;                                          \
  87     typedef exponent_ exponent;                                              \
  88     typedef double value_type;                                               \
  89     static value_type value()   { return(val_); }                            \
  90     static std::string name()   { return(#name_); }                          \
  91     static std::string symbol() { return(#symbol_); }                        \
  92 }
  93
  94 #define BOOST_UNITS_SCALE_DEF(exponent_,value_,name_,symbol_)                 \
  95 BOOST_UNITS_SCALE_SPECIALIZATION(10,static_rational<exponent_>,value_, name_, symbol_)
  96
  97 BOOST_UNITS_SCALE_DEF(-24, 1e-24, yocto, y);
  98 BOOST_UNITS_SCALE_DEF(-21, 1e-21, zepto, z);
  99 BOOST_UNITS_SCALE_DEF(-18, 1e-18, atto, a);
 100 BOOST_UNITS_SCALE_DEF(-15, 1e-15, femto, f);
 101 BOOST_UNITS_SCALE_DEF(-12, 1e-12, pico, p);
 102 BOOST_UNITS_SCALE_DEF(-9, 1e-9, nano, n);
 103 BOOST_UNITS_SCALE_DEF(-6, 1e-6, micro, u);
 104 BOOST_UNITS_SCALE_DEF(-3, 1e-3, milli, m);
 105 BOOST_UNITS_SCALE_DEF(-2, 1e-2, centi, c);
 106 BOOST_UNITS_SCALE_DEF(-1, 1e-1, deci, d);
 107
 108 BOOST_UNITS_SCALE_DEF(1, 1e1, deka, da);
 109 BOOST_UNITS_SCALE_DEF(2, 1e2, hecto, h);
 110 BOOST_UNITS_SCALE_DEF(3, 1e3, kilo, k);
 111 BOOST_UNITS_SCALE_DEF(6, 1e6, mega, M);
 112 BOOST_UNITS_SCALE_DEF(9, 1e9, giga, G);
 113 BOOST_UNITS_SCALE_DEF(12, 1e12, tera, T);
 114 BOOST_UNITS_SCALE_DEF(15, 1e15, peta, P);
 115 BOOST_UNITS_SCALE_DEF(18, 1e18, exa, E);
 116 BOOST_UNITS_SCALE_DEF(21, 1e21, zetta, Z);
 117 BOOST_UNITS_SCALE_DEF(24, 1e24, yotta, Y);
 118
 119 BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<10>, 1024.0, kibi, Ki);
 120 BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<20>, 1048576.0, mebi, Mi);
 121 BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<30>, 1073741824.0, gibi, Gi);
 122 BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<40>, 1099511627776.0, tebi, Ti);
 123 BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<50>, 1125899906842624.0, pebi, Pi);
 124 BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<60>, 1152921504606846976.0, exbi, Ei);
 125 BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<70>, 1180591620717411303424.0, zebi, Zi);
 126 BOOST_UNITS_SCALE_SPECIALIZATION(2, static_rational<80>, 1208925819614629174706176.0, yobi, Yi);
 127
 128 #undef BOOST_UNITS_SCALE_DEF
 129 #undef BOOST_UNITS_SCALE_SPECIALIZATION
 130
 131 #endif
 132
 133 } // namespace units
 134
 135 } // namespace boost
 136
 137 #if BOOST_UNITS_HAS_BOOST_TYPEOF
 138
 139 #include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
 140
 141 BOOST_TYPEOF_REGISTER_TEMPLATE(boost::units::scale, (long)(class))
 142
 143 #endif
 144
 145 #endif