1 // ratio_fwd.hpp ---------------------------------------------------------------// 2 3 // Copyright 2008 Howard Hinnant 4 // Copyright 2008 Beman Dawes 5 // Copyright 2009 Vicente J. Botet Escriba 6 7 // Distributed under the Boost Software License, Version 1.0. 8 // See http://www.boost.org/LICENSE_1_0.txt 9 10 /* 11 12 This code was derived by Beman Dawes from Howard Hinnant's time2_demo prototype. 13 Many thanks to Howard for making his code available under the Boost license. 14 The original code was modified to conform to Boost conventions and to section 15 20.4 Compile-time rational arithmetic [ratio], of the C++ committee working 16 paper N2798. 17 See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2798.pdf. 18 19 time2_demo contained this comment: 20 21 Much thanks to Andrei Alexandrescu, 22 Walter Brown, 23 Peter Dimov, 24 Jeff Garland, 25 Terry Golubiewski, 26 Daniel Krugler, 27 Anthony Williams. 28 */ 29 30 // The way overflow is managed for ratio_less is taken from llvm/libcxx/include/ratio 31 32 #ifndef BOOST_RATIO_RATIO_FWD_HPP 33 #define BOOST_RATIO_RATIO_FWD_HPP 34 35 #include <boost/ratio/config.hpp> 36 37 #if defined(__GNUC__) && (__GNUC__ >= 4) 38 #pragma GCC system_header 39 #endif 40 41 namespace boost 42 { 43 44 //----------------------------------------------------------------------------// 45 // // 46 // 20.6 Compile-time rational arithmetic [ratio] // 47 // // 48 //----------------------------------------------------------------------------// 49 50 // ratio 51 template <boost::intmax_t N, boost::intmax_t D = 1> class ratio; 52 53 // ratio arithmetic 54 template <class R1, class R2> struct ratio_add; 55 template <class R1, class R2> struct ratio_subtract; 56 template <class R1, class R2> struct ratio_multiply; 57 template <class R1, class R2> struct ratio_divide; 58 #ifdef BOOST_RATIO_EXTENSIONS 59 template <class R1, class R2> struct ratio_gcd; 60 template <class R1, class R2> struct ratio_lcm; 61 template <class R> struct ratio_negate; 62 template <class R> struct ratio_abs; 63 template <class R> struct ratio_sign; 64 template <class R, int P> struct ratio_power; 65 #endif 66 67 // ratio comparison 68 template <class R1, class R2> struct ratio_equal; 69 template <class R1, class R2> struct ratio_not_equal; 70 template <class R1, class R2> struct ratio_less; 71 template <class R1, class R2> struct ratio_less_equal; 72 template <class R1, class R2> struct ratio_greater; 73 template <class R1, class R2> struct ratio_greater_equal; 74 75 // convenience SI typedefs 76 typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(1000000000000000000)> atto; 77 typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(1000000000000000)> femto; 78 typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(1000000000000)> pico; 79 typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(1000000000)> nano; 80 typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(1000000)> micro; 81 typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(1000)> milli; 82 typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(100)> centi; 83 typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(10)> deci; 84 typedef ratio< BOOST_RATIO_INTMAX_C(10), BOOST_RATIO_INTMAX_C(1)> deca; 85 typedef ratio< BOOST_RATIO_INTMAX_C(100), BOOST_RATIO_INTMAX_C(1)> hecto; 86 typedef ratio< BOOST_RATIO_INTMAX_C(1000), BOOST_RATIO_INTMAX_C(1)> kilo; 87 typedef ratio< BOOST_RATIO_INTMAX_C(1000000), BOOST_RATIO_INTMAX_C(1)> mega; 88 typedef ratio< BOOST_RATIO_INTMAX_C(1000000000), BOOST_RATIO_INTMAX_C(1)> giga; 89 typedef ratio< BOOST_RATIO_INTMAX_C(1000000000000), BOOST_RATIO_INTMAX_C(1)> tera; 90 typedef ratio< BOOST_RATIO_INTMAX_C(1000000000000000), BOOST_RATIO_INTMAX_C(1)> peta; 91 typedef ratio<BOOST_RATIO_INTMAX_C(1000000000000000000), BOOST_RATIO_INTMAX_C(1)> exa; 92 93 #ifdef BOOST_RATIO_EXTENSIONS 94 95 #define BOOST_RATIO_1024 BOOST_RATIO_INTMAX_C(1024) 96 97 // convenience IEC typedefs 98 typedef ratio< BOOST_RATIO_1024> kibi; 99 typedef ratio< BOOST_RATIO_1024*BOOST_RATIO_1024> mebi; 100 typedef ratio< BOOST_RATIO_1024*BOOST_RATIO_1024*BOOST_RATIO_1024> gibi; 101 typedef ratio< BOOST_RATIO_1024*BOOST_RATIO_1024*BOOST_RATIO_1024*BOOST_RATIO_1024> tebi; 102 typedef ratio< BOOST_RATIO_1024*BOOST_RATIO_1024*BOOST_RATIO_1024*BOOST_RATIO_1024*BOOST_RATIO_1024> pebi; 103 typedef ratio<BOOST_RATIO_1024*BOOST_RATIO_1024*BOOST_RATIO_1024*BOOST_RATIO_1024*BOOST_RATIO_1024*BOOST_RATIO_1024> exbi; 104 105 #endif 106 } // namespace boost 107 108 109 #endif // BOOST_RATIO_HPP 110