90 lines
3.8 KiB
C++
90 lines
3.8 KiB
C++
// ratio_fwd.hpp ---------------------------------------------------------------//
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// Copyright 2008 Howard Hinnant
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// Copyright 2008 Beman Dawes
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// Copyright 2009 Vicente J. Botet Escriba
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// Distributed under the Boost Software License, Version 1.0.
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// See http://www.boost.org/LICENSE_1_0.txt
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/*
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This code was derived by Beman Dawes from Howard Hinnant's time2_demo prototype.
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Many thanks to Howard for making his code available under the Boost license.
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The original code was modified to conform to Boost conventions and to section
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20.4 Compile-time rational arithmetic [ratio], of the C++ committee working
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paper N2798.
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See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2798.pdf.
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time2_demo contained this comment:
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Much thanks to Andrei Alexandrescu,
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Walter Brown,
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Peter Dimov,
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Jeff Garland,
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Terry Golubiewski,
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Daniel Krugler,
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Anthony Williams.
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*/
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// The way overflow is managed for ratio_less is taken from llvm/libcxx/include/ratio
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#ifndef BOOST_RATIO_RATIO_FWD_HPP
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#define BOOST_RATIO_RATIO_FWD_HPP
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#include <boost/cstdint.hpp>
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#ifdef INTMAX_C
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#define BOOST_RATIO_INTMAX_C(a) INTMAX_C(a)
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#else
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#define BOOST_RATIO_INTMAX_C(a) a##LL
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#endif
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namespace boost
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{
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//----------------------------------------------------------------------------//
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// //
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// 20.6 Compile-time rational arithmetic [ratio] //
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// //
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//----------------------------------------------------------------------------//
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// ratio
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template <boost::intmax_t N, boost::intmax_t D = 1> class ratio;
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// ratio arithmetic
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template <class R1, class R2> struct ratio_add;
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template <class R1, class R2> struct ratio_subtract;
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template <class R1, class R2> struct ratio_multiply;
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template <class R1, class R2> struct ratio_divide;
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// ratio comparison
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template <class R1, class R2> struct ratio_equal;
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template <class R1, class R2> struct ratio_not_equal;
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template <class R1, class R2> struct ratio_less;
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template <class R1, class R2> struct ratio_less_equal;
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template <class R1, class R2> struct ratio_greater;
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template <class R1, class R2> struct ratio_greater_equal;
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// convenience SI typedefs
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typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(1000000000000000000)> atto;
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typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(1000000000000000)> femto;
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typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(1000000000000)> pico;
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typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(1000000000)> nano;
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typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(1000000)> micro;
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typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(1000)> milli;
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typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(100)> centi;
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typedef ratio<BOOST_RATIO_INTMAX_C(1), BOOST_RATIO_INTMAX_C(10)> deci;
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typedef ratio< BOOST_RATIO_INTMAX_C(10), BOOST_RATIO_INTMAX_C(1)> deca;
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typedef ratio< BOOST_RATIO_INTMAX_C(100), BOOST_RATIO_INTMAX_C(1)> hecto;
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typedef ratio< BOOST_RATIO_INTMAX_C(1000), BOOST_RATIO_INTMAX_C(1)> kilo;
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typedef ratio< BOOST_RATIO_INTMAX_C(1000000), BOOST_RATIO_INTMAX_C(1)> mega;
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typedef ratio< BOOST_RATIO_INTMAX_C(1000000000), BOOST_RATIO_INTMAX_C(1)> giga;
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typedef ratio< BOOST_RATIO_INTMAX_C(1000000000000), BOOST_RATIO_INTMAX_C(1)> tera;
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typedef ratio< BOOST_RATIO_INTMAX_C(1000000000000000), BOOST_RATIO_INTMAX_C(1)> peta;
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typedef ratio<BOOST_RATIO_INTMAX_C(1000000000000000000), BOOST_RATIO_INTMAX_C(1)> exa;
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} // namespace boost
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#endif // BOOST_RATIO_HPP
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