| 1 | // ratio.hpp ---------------------------------------------------------------// |
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| 2 | |
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| 3 | // Copyright 2008 Howard Hinnant |
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| 4 | // Copyright 2008 Beman Dawes |
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| 5 | // Copyright 2009 Vicente J. Botet Escriba |
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| 6 | |
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| 7 | // Distributed under the Boost Software License, Version 1.0. |
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| 8 | // See http://www.boost.org/LICENSE_1_0.txt |
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| 9 | |
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| 10 | /* |
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| 11 | |
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| 12 | This code was derived by Beman Dawes from Howard Hinnant's time2_demo prototype. |
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| 13 | Many thanks to Howard for making his code available under the Boost license. |
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| 14 | The original code was modified to conform to Boost conventions and to section |
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| 15 | 20.4 Compile-time rational arithmetic [ratio], of the C++ committee working |
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| 16 | paper N2798. |
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| 17 | See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2798.pdf. |
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| 18 | |
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| 19 | time2_demo contained this comment: |
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| 20 | |
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| 21 | Much thanks to Andrei Alexandrescu, |
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| 22 | Walter Brown, |
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| 23 | Peter Dimov, |
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| 24 | Jeff Garland, |
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| 25 | Terry Golubiewski, |
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| 26 | Daniel Krugler, |
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| 27 | Anthony Williams. |
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| 28 | */ |
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| 29 | |
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| 30 | // The way overflow is managed for ratio_less is taken from llvm/libcxx/include/ratio |
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| 31 | |
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| 32 | #ifndef BOOST_RATIO_RATIO_HPP |
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| 33 | #define BOOST_RATIO_RATIO_HPP |
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| 34 | |
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| 35 | #include <boost/ratio/ratio_fwd.hpp> |
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| 36 | #include <boost/ratio/detail/gcd_lcm.hpp> |
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| 37 | |
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| 38 | namespace boost |
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| 39 | { |
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| 40 | |
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| 41 | // extension used by Chrono |
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| 42 | |
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| 43 | template <class R1, class R2> using ratio_gcd = typename ratio< |
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| 44 | ratio_detail::gcd<R1::num, R2::num>::value, |
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| 45 | ratio_detail::lcm<R1::den, R2::den>::value>::type; |
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| 46 | |
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| 47 | } // namespace boost |
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| 48 | |
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| 49 | #endif // BOOST_RATIO_RATIO_HPP |
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| 50 | |
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